WO2023035038A1 - A cutting head assembly - Google Patents
A cutting head assembly Download PDFInfo
- Publication number
- WO2023035038A1 WO2023035038A1 PCT/AU2022/051092 AU2022051092W WO2023035038A1 WO 2023035038 A1 WO2023035038 A1 WO 2023035038A1 AU 2022051092 W AU2022051092 W AU 2022051092W WO 2023035038 A1 WO2023035038 A1 WO 2023035038A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- head assembly
- rock fragments
- primary
- mine wall
- cutting head
- Prior art date
Links
- 238000005520 cutting process Methods 0.000 title claims abstract description 162
- 239000011435 rock Substances 0.000 claims abstract description 182
- 239000012634 fragment Substances 0.000 claims abstract description 156
- 230000007246 mechanism Effects 0.000 claims abstract description 155
- 238000011143 downstream manufacturing Methods 0.000 claims abstract description 20
- 239000012530 fluid Substances 0.000 claims description 33
- 238000005065 mining Methods 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 10
- 230000032258 transport Effects 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 description 20
- 239000002360 explosive Substances 0.000 description 9
- 229910052500 inorganic mineral Inorganic materials 0.000 description 9
- 239000011707 mineral Substances 0.000 description 9
- 238000004891 communication Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 5
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- 239000002002 slurry Substances 0.000 description 4
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- 238000012544 monitoring process Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000005549 size reduction Methods 0.000 description 3
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- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
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- MTPVUVINMAGMJL-UHFFFAOYSA-N trimethyl(1,1,2,2,2-pentafluoroethyl)silane Chemical compound C[Si](C)(C)C(F)(F)C(F)(F)F MTPVUVINMAGMJL-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/20—General features of equipment for removal of chippings, e.g. for loading on conveyor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/20—Mineral freed by means not involving slitting
- E21C27/32—Mineral freed by means not involving slitting by adjustable or non-adjustable planing means with or without loading arrangements
- E21C27/44—Planing knives
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/20—Mineral freed by means not involving slitting
- E21C27/32—Mineral freed by means not involving slitting by adjustable or non-adjustable planing means with or without loading arrangements
- E21C27/36—Machine self-propelled along the working face
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/20—Mineral freed by means not involving slitting
- E21C27/32—Mineral freed by means not involving slitting by adjustable or non-adjustable planing means with or without loading arrangements
- E21C27/38—Machine stationary while planing in an arc
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/20—Mineral freed by means not involving slitting
- E21C27/32—Mineral freed by means not involving slitting by adjustable or non-adjustable planing means with or without loading arrangements
- E21C27/42—Mineral freed by means not involving slitting by adjustable or non-adjustable planing means with or without loading arrangements combined with scraper or collector box
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/20—Mineral freed by means not involving slitting
- E21C27/46—Mineral freed by means not involving slitting by percussed planing means
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C29/00—Propulsion of machines for slitting or completely freeing the mineral from the seam
- E21C29/22—Propulsion of machines for slitting or completely freeing the mineral from the seam by wheels, endless tracks or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/06—Equipment for positioning the whole machine in relation to its sub-structure
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/025—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with scraper-buckets, dippers or shovels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C27/00—Machines which completely free the mineral from the seam
- E21C27/20—Mineral freed by means not involving slitting
- E21C27/30—Mineral freed by means not involving slitting by jaws, buckets or scoops that scoop-out the mineral
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C31/00—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam
- E21C31/10—Driving means incorporated in machines for slitting or completely freeing the mineral from the seam for slewing parts of the machines
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
- E21C35/08—Guiding the machine
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/26—Methods of surface mining; Layouts therefor
- E21C41/30—Methods of surface mining; Layouts therefor for ores, e.g. mining placers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/03—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws
Definitions
- the present disclosure relates to a cutting head assembly.
- the present disclosure relates to a cutting head assembly for excavating rock fragments from a mine wall.
- Open pit and underground mining of hard rock typically uses one of either explosive excavation or mechanical rock fragmentation excavation.
- Explosive excavation entails drilling a pattern of holes of relatively small diameter over an area of a rock body being excavated, and loading those holes with explosive charges. Once loaded, the explosive charges are then detonated in a sequence intended to fragment a required volume of rock for subsequent removal by suitable loading and transport equipment. This process is repeated cyclically until the required excavation is complete.
- the cyclical nature of explosive excavation and the violent nature of the rock fragmentation have, to date, presented difficulties to automating the explosive process and complicated downstream processing due to the unpredictable size distribution of the resultant rock fragments requiring re-handling.
- Embodiments of the present disclosure relate to a cutting head which excavates and mechanically processes rock fragments from, for example, a mine wall so as to provide, for downstream processing, processed rock fragments having at least one geometric dimension which depend on the mechanical processing of the excavated rock fragments by the cutting head.
- a cutting head which excavates and mechanically processes rock fragments from, for example, a mine wall so as to provide, for downstream processing, processed rock fragments having at least one geometric dimension which depend on the mechanical processing of the excavated rock fragments by the cutting head.
- the cutting head is configured to break rock fragments from the mine wall and mechanically process the resultant rock fragments prior to a downstream processing stage to provide, for the downstream processing stage, rock fragments having at least one geometric dimension which is dependent on the mechanical processing.
- the mechanical processing involves reducing the size of rock fragments having a geometric dimension which obstructs them from passing through one or more ports of the cutting head. Once so reduced in size, processed rock fragments are then able to proceed, via a respective port, to the downstream processing stage.
- a cutting head assembly for excavating rock fragments from a mine wall
- the cutting head assembly comprising: a primary breakage mechanism actuable to apply, to the mine wall, a breakage force for breaking rock fragments from the mine wall; a surface for catching the rock fragments broken from the mine wall, the surface having one or more ports associated therewith; and a secondary breakage mechanism operatively associated with the surface, the secondary breakage mechanism actuable to apply a force for reducing the size of at least some of the rock fragments caught by the surface so as to allow at least the reduced size rock fragments to pass through a respective ports for transportation to downstream processing.
- the primary breakage mechanism comprises one or more primary cutters for breaking rock fragments from the mine wall.
- the or each of the primary cutters comprise one or more cutting elements for excavating rock fragments from the mine wall.
- the or each cutting element provides a depth of cut in the mine wall in the range of 30mm to 80mm.
- the breakage force is a percussive force applied by actuation of the primary breakage mechanism.
- actuation of the primary breakage mechanism to provide the percussive force involves a reciprocating action of the one or more primary cutters.
- the percussive force of the primary breakage mechanism provides between 50J and 1000J of impact energy at 20 to 400Hz. In a particular embodiment, the primary breakage mechanism provides between 300 J and 400 J of impact energy at a frequency of between 60 and 70Hz.
- the secondary breakage mechanism may comprise one or more secondary cutters.
- the or each secondary cutter comprises one or more blades for reducing the size of at least some of the rock fragments caught by the surface.
- the or each blade is proximally associated with the or each port.
- the proximally association is such that a blade co-operates with a respective at least one port as to provide the secondary breakage mechanism.
- the or each blade co-operates with a respective at least one port to provide operatively associated shearing surfaces for providing the secondary breakage mechanism.
- Actuation of the secondary breakage mechanism may involve moving the or each blade so as to shear at least some of the rock fragments located within a port to thereby reduce the size of that rock fragment and thus allow the reduced size rock fragments to move off of the surface through the proximally associated port.
- the or each blade contacts with and sweeps across a portion of the surface so as stir the rock fragments caught by the surface after operation of the primary breakage mechanism.
- the stirring involves the one or more blades pushing or guiding at least some of the rock fragments towards respective port or ports proximally associated with the respective blade.
- the or each secondary cutter of the secondary breakage mechanism is associated with at least one of the primary cutters of the primary breakage mechanism.
- the primary breakage mechanism is actuated by a primary actuator and the secondary breakage mechanism is actuated by a secondary actuator.
- the primary and secondary actuators are independently operable.
- the primary and secondary actuators are hydraulic actuators.
- the secondary actuator actuates the secondary breakage mechanism subsequent to the primary actuator actuating the primary breakage mechanism.
- the cutting head assembly further comprises a fluid passageway located within a housing.
- the fluid passageway extends between the or each port and an outlet to allow fluid communication therebetween of rock fragments which have moved from the surface via a port.
- the rock fragments communicated between the or each port and the outlet via the fluid passageway includes rock fragments which have been processed, and thus reduced in size, by the secondary breakage mechanism so as to enable them to pass through a respective port, and rock fragments not requiring a reduction in size to pass through a respective port.
- the fluid communication of the rock fragments via the fluid passageway involves the application of a negative pressure or a suction pressure.
- the outlet is proximal to a drive gear located on or within the housing.
- the drive gear connects to a pump, such as a suction pump, of a miner body to generate a negative or suction pressure sufficient to transport the rock fragments, which have passed through the or each port, to the outlet and subsequently to the miner body.
- the drive gear is located on a top of the housing.
- the drive gear engages with a connecting gear of the miner body so as to connect the cutting head assembly to a mining system via the miner body.
- the drive gear comprises a swing gear capable of rotating the cutting head assembly about a rotational axis of the connecting gear of the miner body.
- the swing gear is capable of rotating the cutting head assembly up to 190 degrees about the rotational axis of the connecting gear.
- the drive gear provides a feed force to, and controls the width of, an excavated face.
- steering plates direct a reactive force of the swing motor onto the cutting face with the rock face “in front” of the respective steering plate absorbing that force.
- the drive gear transmits a feed force from the miner body to the cutting head assembly.
- the feed force may be proportional to an applied weight of the miner body.
- the feed force is output at the primary breakage mechanism and subsequently applied to the mine wall. In certain embodiments, the feed force thus originates from a drive gear.
- the miner body controls the depth of cut via an adjustable support mechanism coupled to or otherwise connected with the base carrier.
- the adjustable support mechanism may include, for example, a cable arrangement.
- a combination of the feed force and the percussive force of the primary breakage mechanism permits the cutting head assembly to engage with, and maintain engagement with, the mine wall.
- the feed force transmitted from the miner body to the cutting head assembly may be communicated as a force of up to 20 tonnes at the primary breakage mechanism.
- the housing of the cutting head assembly is a sealed arrangement such that the cutting head assembly is operable when submerged in a fluid.
- the mine wall fails in tension when the primary breakage mechanism is actuated to apply the breakage force to the mine wall.
- the or each cutting element is a cutting insert, such as a Poly crystalline Diamond (PCD) insert.
- PCD Poly crystalline Diamond
- the or each primary cutter is removably securable to the primary breakage mechanism.
- the size, shape and metallurgy of the or each primary cutter will vary according to rock type. It is possible that custom sized inserts will be required to suit certain ground conditions.
- a suitable material is tungsten carbide.
- the or each primary cutter is removably securable from the primary breakage mechanism by a retaining mechanism.
- the reduced size rock fragments are sufficiently small in size so as to be easily transported and processed.
- the reduced size rock fragments have at least one geometric dimension of a predictable size as a result of the actuation of the secondary breakage mechanism.
- the predictable fragment size of the reduced sized rock fragments are sized and shaped to be transported through the one or more ports to the outlet.
- the cutting head assembly further comprises a control system, wherein the control system actuates and monitors the primary and secondary actuators of the primary and secondary breakage mechanisms.
- the control system may comprise, for example, a remote control interface which supports remote monitoring and control of the primary and secondary actuators of the primary and secondary breakage mechanisms, at the least.
- a cutting head assembly for excavating rock fragments from a mine wall
- the cutting head assembly comprising: a primary breakage mechanism actuable to apply, to the mine wall, a breakage force for breaking rock fragments from the mine wall; a housing comprising a fluid passageway and a surface for catching the rock fragments broken from the mine wall, the surface having one or more ports associated therewith, wherein the fluid passageway extends between the one or more ports and an outlet; a secondary breakage mechanism operatively associated with the surface and proximal to the one or more ports, the secondary breakage mechanism actuable to apply a force for reducing the size of at least some of the rock fragments caught by the surface so as to allow at least the reduced size rock fragments to move off of the surface through the one or more ports; and wherein, in use, the secondary breakage mechanism actuates subsequent to the primary breakage mechanism and a suction pressure applied to the outlet transports the reduced sized rock fragments via the
- a cutting head assembly for excavating rock fragments from a mine wall
- the cutting head assembly comprising: a housing comprising one or more ports in fluid communication via a fluid passageway with an outlet and a surface, wherein the surface is configured for catching rock fragments from the mine wall; a primary breakage mechanism comprising a shank and a head comprising a cutting element, wherein the cutting element engages the mine wall; a primary actuator coupled to the housing, wherein the primary actuator comprises an annular body for receiving at least a portion of the shank therein; a secondary breakage mechanism comprising a secondary cutter coupled to a secondary actuator mounted on the housing; and wherein, in use, the primary actuator transmits a percussive force to reciprocate the primary breakage mechanism to break rock fragments from the mine wall and the secondary actuator transmits a shearing force to oscillate the secondary breakage mechanism to shear the resultant rock fragments caught by the surface and received by the one or more ports so
- Figure 1 is a perspective view of a cutting head assembly according to an embodiment
- Figure 2 is a side cross-sectional view of the cutting head assembly of Figure 1;
- Figure 3 is a bottom view of the cutting head assembly of Figures 1 and 2;
- Figure 4 is a schematic view of a primary breakage mechanism according to an embodiment
- Figure 5 is a front view of the primary breakage mechanism of Figure 4;
- Figure 6 is a side view of the primary breakage mechanism of Figures 4 and 5;
- Figure 7 is a perspective detail view of a secondary breakage mechanism of the cutting head assembly
- Figure 8 is a perspective detail view of the secondary breakage mechanism of Figure 7 illustrating one or more ports and an excavated rock fragment;
- Figure 9 is a side sectional view detailing a port, a fluid passageway, the primary and secondary breakage mechanisms of the cutting head assembly;
- Figure 10 is a detailed view of the primary breakage mechanism engaging a mine wall
- Figure 11 is a perspective view of a cutting head assembly according to an alternative embodiment
- Figure 12 is a perspective view of a mining system comprising a miner body and the cutting head assembly according to an embodiment
- Figure 13 is a perspective alternate view of the mining system of Figure 12 illustrating the mining system, the miner body and the cutting head assembly;
- Figure 14 is a perspective view detailing the mining system of Figures 12 and 13;
- Figure 15 is a schematic view illustrating the miner body and the cutting head assembly in operation
- Figure 16 is a perspective view of the miner body of Figure 15;
- Figure 17 is a side detail view of a cutting head assembly, according to certain embodiments, illustrating a primary breakage mechanism actuating to apply to a mine wall a breakage force for breaking rock fragments from the mine wall;
- Figure 18 is a side sectional view of the cutting head assembly of Figure 17, illustrating a surface catching the rock fragments broken from the mine wall; and [0064] Figure 19 is a side sectional view of the cutting head assembly of Figure 18, illustrating a secondary breakage mechanism actuating to apply a force for reducing the size f at least some of the rock fragments caught by the surface.
- FIG. 1 there is illustrated a cutting head assembly (100) according to an embodiment of the present disclosure, for excavating rock fragments from a mine wall.
- the cutting head assembly (100) engages a mine wall (1000, ref. Figure 10) to cause a primary mode of failure of the mine wall (1000) due to tension resultant of percussive forces generated by the cutting head assembly (100).
- a percussive force to generate tension allows the cutting head assembly (100) to excavate a mine wall (1000) comprising rock which is susceptible to breaking into rock fragments under tensile failure.
- certain embodiments of the present disclosure involve transmitting energy into the rock as wave energy which causes tensional spalling and explosive rock failure.
- a cutting head assembly (100) comprises a primary breakage mechanism (10) actuable to apply, to the mine wall (1000), a breakage force for breaking rock fragments from the mine wall (1000).
- the depicted cutting head assembly (100) also comprises a surface (20) for catching the rock fragments broken from the mine wall (1000) by primary breakage mechanism (10), the surface (20) itself having one or more ports (21) associated therewith. The function of, and interaction between, the surface (20) and the ports (21) of the cutting head assembly (100) will be described in more detail below.
- the cutting head assembly (100) additionally comprises a secondary breakage mechanism (30) which is operatively associated with the surface (20). As will be described in more detail below, in use the secondary breakage mechanism (30) is actuable to apply a force for reducing the size of at least some of the rock fragments caught by the surface (20) so as to allow at least the reduced size rock fragments to move off of the surface (20) through the one or more ports (21) for downstream processing.
- the surface (20) of the cutting head assembly (100) catches the rock fragments broken, resultant of the breakage force applied by the primary breakage mechanism (10) from the mine wall (1000).
- the surface (20) shown here comprises a substantially flat surface.
- the surface (20) may have any suitable configuration or form.
- suitable configurations and/or forms include a surface of any one of a “tray”, “platform”, “ledge”, “catch”, “trap” or the like which is configured to function so as to catch the rock fragments broken as a result of the breakage force applied by the primary breakage mechanism (10).
- the one or more ports (21) are sized and shaped so as to permit at least the reduced size rock fragments to pass therethrough.
- the one or more ports (21) advantageously ensure that only rock fragments having at least one geometric dimension which is less than a certain size are passed via a port (21) for downstream processing, noting that it is possible that not all rock fragments caught by the surface will require a size reduction in order to pass through a port (21) since some of the rock fragments caught by the surface (20) may be able to pass through a port (21) without requiring a size reduction.
- rock fragments caught by the surface (20) which do not require a size reduction in order to pass through a port (21) will nevertheless be reduced in size by the secondary breakage mechanism (30).
- the reduction in size of an “original” rock fragment involves the use of a secondary breakage mechanism (30) which applies a shearing force to the “original” rock fragment so as to “cut” the original rock fragment into two or more smaller rock fragments of a reduced size compared to the “original” rock fragment.
- the secondary breakage mechanism (30) may involve a crushing pulverising, or impact type force which breaks the original rock fragment into two or more smaller rock fragments of a reduced size compared to the “original” rock.
- a pressurised jet of gas or fluid may be used to erode or cut an original rock fragment into two or more smaller rock fragments.
- the secondary breakage mechanism (30) may involve a combination of forces generated by different means.
- the size and shape of the one or more ports (21) may be configured to allow rock fragments which are sufficiently small in size to be easily transported and processed downstream.
- the size and shape of the one or more ports (21) enables the rock fragments which pass through a port (21) to have at least one geometric dimension of a predictable size and thus to provide rock fragments having a predictable fragment size for at least that geometric dimension, with the predictable fragment size being one whereby the rock fragments have a size and shape which permits them to pass through the one or more ports (21).
- the primary breakage mechanism (10) comprises one or more primary cutters (11) for breaking rock fragments from the mine wall (1000).
- each primary cutter (11) is positioned to engage the mine wall (1000) when the primary breakage mechanism (10) is actuated to apply the primary breakage force to break rock fragments from the mine wall (1000).
- the or each primary cutter (11) may be manufactured of a sufficiently hardened material comprising high tensile strength, capable of applying large tensile forces in use to the mine wall (1000).
- the or each primary cutter (11) comprises one or more cutting elements (12) for excavating the rock fragments from the mine wall (1000).
- the one or more cutting elements (12) of the or each primary cutter (11) engage the mine wall (1000) when the primary breakage mechanism (10) is actuated to apply the breakage force.
- the depicted one or more cutting elements (12) are positioned and arranged to engage the mine wall (1000) and excavate the mine wall (1000) by application of the breakage force on actuation of the primary breakage mechanism (10).
- the one or more cutting elements (12) are selected to cause a failure of the mine wall (1000), and its geology, via tensile failure of the mine wall (1000).
- hard rock is known to have a high compressive strength.
- the tensile strength of hard rock is typically 10% of the compressive strength.
- the primary breakage mechanism (10), and subsequently the or each of the primary cutters (11) and the one or more cutting elements (12) are selected to exploit this weakness of hard rock.
- the primary breakage mechanism (10) and subsequently the or each of the primary cutters (11) and the one or more cutting elements (12) are manufactured and designed so as to advantageously apply the breakage force to tire mine wall (1000) such that the broken rock fragments are resultant of tensile failure of the mine wall (1000).
- Tensile failure of hard rock typically results from tension cracks forming at a point of contact between either one of the or each primary cutter (11) or the one or more cutting elements (12) and the mine wall (1000).
- the primary cutters (11) and/or the one or more cutting elements (12) are manufactured from a material or materials according to the geology and rock expected to be excavated in the mine wall (1000) by the cutting head assembly (100). Suitable materials would be well understood by a person skilled in the art.
- the one or more cutting elements (12) provide up to an 80mm “depth of cut” in the mine wall (1000), with the actual depth depending on various factors, including the geology of the rock.
- the one or more cutting elements (12) may be designed and/or arranged to provide an “angle of attack”, being the angle at which the cutting element (12) engages the mine wall (100).
- the combination of the angle of attack and percussive force results in lower temperatures generated at the one or more cutting elements (12) compared to conventional drilling based techniques, advantageously improving the life of the cutting elements (12).
- the use of conventional percussion or tri-cone/drag bit drilling applications results in the generation of high temperatures, resulting in de-lamination of cutting elements used in these applications.
- the one or more cutting elements (12) are Polycrystalline Diamond (PCD) inserts, as are well known for their use in mining and drilling operations, particularly in those applications involving hard rock or ore bodies.
- PCD Polycrystalline Diamond
- the one or more cutting elements (12) and their associated angle of attack effectively excavates the mine wall (1000) in a manner such as to “plane off’ the rock fragments, as opposed to drilling or boring into the mine wall (1000), using the percussive force applied by the primary breakage mechanism (10) to cause a tensile failure of the mine wall (1000).
- Suitable alternative cutting elements (12) such as tungsten carbide inserts, titanium carbide inserts and others may also be selected for use, and the selection of cutting elements (12) would be well within the knowledge of a skilled person.
- the person skilled in the art will also appreciate that the selection of cutting elements (12) involves consideration of the friction forces and temperatures during excavation/engagement of the mine wall at high contact pressures, commonly greater than 2GPa pressure waves (as often encountered in percussion drilling).
- the breakage force is a percussive force applied by actuation of the primary breakage mechanism (10).
- the percussive force of applied by the primary breakage mechanism (10) provides up to 1000J of impact energy at 20 to 400Hz.
- the impact energy and frequency of the percussive force applied by the primary breakage mechanism (10) may vary according to the geology and rock expected to be excavated in the mine wall (1000) by the cutting head assembly (100). Suitable impact energy and frequency parameters would be well within the knowledge of a skilled person.
- the primary breakage mechanism (10) when actuated, causes a pressure wave at the speed of sound to penetrate through the mine wall (1000) (via reciprocating motion) when engaged by the or each primary cutters (11), and thus by the one or more cutting elements (12). Engagement of cutting elements (12) with the mine wall (1000) applies sufficient percussive force such that the mine wall (1000) fails in tension.
- the cutting elements (12) have an “angle of attack”
- the combination of the angle of attack and the percussive force applied by actuation of the primary breakage mechanism effectively excavates the mine wall (1000) by causing rock fragmentation.
- the primary breakage mechanism (10) comprises a shank (14) and a head (15), the head (15) being at one end of the shank (14).
- the head (15) comprises the primary cutter (11), which itself comprises or supports the one or more cutting elements (12).
- the one or more cutting elements (12) are positioned and/or arranged to engage the mine wall (1000) to impart the breakage force thereupon.
- the shank (14) comprises a receptacle (16) which is sized and shaped to receive a portion of a retaining mechanism (13) therein (ref. Figure 3).
- the or each primary cutter (11) is removably securable to the primary breakage mechanism (10).
- the retaining mechanism (13) comprises a retaining pin which removably secures the or each primary cutter (11) to the primary breakage mechanism (10).
- the primary breakage mechanism (11) may be removed from the primary breakage mechanism (10) by removing the retaining pin (13), a portion of which is received within the receptacle (16) of the shank (14). In this way, the or each primary cutter (11), and subsequently the one or more cutting elements (12), may be easily removed from the primary breakage mechanism (10) after use for repair, inspection or replacement with another primary cutter (11).
- the secondary breakage mechanism (30) comprises one or more secondary cutters (31).
- the or each secondary cutter (31) may be designed such that on actuation of the secondary breakage mechanism (30), the or each secondary cutter (31) applies the force for reducing the size of at least some of the rock fragments caught by the surface (20) to allow at least the reduced size rock fragments to move off the surface (20) through the one or more ports (21).
- the or each secondary cutter (31) comprises one or more surfaces or edges for reducing the size of at least some of the rock fragments caught by the surface (20).
- the one or more surfaces or edges may be designed to shear the rock fragments broken from the mine wall (1000) caught on the surface (20) and reduce the size of at least some of those rock fragments on actuation of the secondary breakage mechanism (30).
- the or each secondary cutter (31) is proximally associated with a respective one or more ports (21).
- actuation of the secondary breakage mechanism (30) involves moving the or each secondary cutter (31) so as to shear rock fragments at least partially located within a port (21) associated with the surface (20) to thereby allow at least reduced size rock fragments to pass through the proximally associated port (21).
- rock fragments caught by the surface which would otherwise not be able to move off the surface (20) via a port (21), as a result of their size relative to the port (21), may be effectively reduced in size by the secondary cutter (31), resulting in one more rock fragments of a reduced size passing through the port (21) for downstream processing.
- the or each secondary cutter (31) of the secondary breakage mechanism (30) is associated with at least one of the primary cutters (11) of the primary breakage mechanism (10). In this way, for every secondary cutter (31) of the secondary breakage mechanism (30) there is an associated at least one primary cutter (11) of the primary breakage mechanism (10).
- the primary breakage mechanism (10) on actuation applies the breakage force to break rock fragments from the mine wall via the primary cutters (11), the rock fragments broken caught by the surface (20), and subsequently the secondary breakage mechanism (30) is actuated to apply the force to reduce the size of at least some of the rock fragments caught by the surface (20) via the secondary cutter (31).
- the primary breakage mechanism (10) is actuated by a primary actuator (40) and the secondary breakage mechanism (30) is actuated by a secondary actuator (50).
- the primary (40) and secondary (50) actuators may be independently operable. That is to say, that the primary actuator (40) may actuate the primary breakage mechanism (10) so as to apply the breakage force to the mine wall (1000) without actuation of the secondary breakage mechanism (30).
- the cutting head assembly (100) may, as a first action, excavate rock fragments from the mine wall (1000) without processing and extraction of said rock fragments caught by the surface (20) via the one or more ports (21) for downstream processing. This first action may be used, for example, to test the primary breakage mechanism (10) to ensure that the primary cutters (11) and any cutting elements (12) are suitable for the mine wall (1000).
- the secondary actuator (50) actuates the secondary breakage mechanism (30) subsequent to the primary actuator (40) actuating the primary breakage mechanism (10). That is to say, following actuation of the primary breakage mechanism (10) by the primary actuator (40), the secondary breakage mechanism (30) is actuated by the secondary actuator (50). In this way, first the primary breakage mechanism (10) is actuated to apply the breakage force to the mine wall (1000) and break rock fragments therefrom, and the secondary breakage mechanism (30) is actuated to apply the force for reducing the size of at least some of the rock fragments of the mine wall (1000) caught by the surface (20).
- actuation of the primary (40) and secondary (50) actuators may be synchronised so that the primary (10) and secondary (30) breakage mechanisms interoperate to move rock fragments off of the surface (20) through the one or more ports (21) for downstream processing. As described above, this may involve reducing the size of rock fragments caught by the surface (20) to allow at least the reduced size to pass through a port (21).
- the primary (40) and/or secondary (50) actuators may be hydraulic actuators of a type well known in the art.
- the primary actuator (40) is configured to receive at least a portion of the shank (14) of the primary breakage mechanism (10) therein. In this way, the primary actuator (40) is able to reciprocate or actuate the primary breakage mechanism (10) to transmit the breakage force to break the rock fragments from the mine wall (1000).
- the cutting head assembly (100) includes a fluid passageway (22) located within a housing (23) which extends between the or each port (21) and an outlet (26).
- the port (21) shown here is shaped to assist with guiding at least the reduced size rock fragments through the port (21) and into the fluid passageway (22).
- the shape of the port (21) is such that it narrows as it depends towards the fluid passageway (22).
- the fluid passageway (22) is sealed between the or each port (21) and the outlet (26) so as to permit transportation of the reduced size rock fragments therebetween on application of a negative pressure or a suction pressure by suitable means.
- a suction pressure may be applied via the outlet (26) to the one or more ports (21) and the fluid passageway (22) therebetween to create a vacuum which effectively transports at least the reduced size rock fragments received within the one or more ports (21) to the outlet (26) via the fluid passageway (22) for downstream processing.
- at least the reduced size rock fragments are sized and shaped to be transported through the one or more ports (21) via the fluid passageway (22) to the outlet (26).
- the outlet (26) is proximal to a drive gear (24) located on the housing (23).
- the drive gear (24) is a swing gear located on or near a top portion (25) of the housing (23).
- the drive gear (24) is a swing gear located on or near a top portion (25) of the housing (23).
- other mounting arrangements may be possible.
- the suction pump (210) of the miner body (200) shown here comprises a conduit (230) which is connected to the suction pump (210) at one end, and connected to the outlet (26) of the cutting head assembly (100) at an opposite end.
- the suction pump (210) of the miner body (200) can apply a suction pressure to transport at least the reduced size rock fragments from the or each port (21) to the outlet (26) and subsequently to the miner body (200) via the conduit (230).
- the conduit (230) may have any suitable form.
- the conduit may comprise a flexible conduit, such as a hose or the like, sized and shaped so as to be able to apply the suction pressure to the outlet (26) and subsequently the or each port (21), and to be able to transport the reduced size rock fragments therein for downstream processing.
- the conduit (230) must be sealed at both ends connecting at the suction pump (210) and the outlet (26), to allow for the maintenance of a suction pressure which is sufficient to transport rock fragments which for downstream processing whilst suspended in a fluid or slurry.
- the drive gear (24) is configured to engage a connecting gear (220) of the miner body (200) to thereby connect the cutting head assembly (100) to a mining system (300) via the miner body (200).
- the drive gear may comprise a swing gear (27) capable of rotating the cutting head assembly (100) about an axis of the connecting gear (220) of the miner body (200).
- the swing gear (27) allows for rotation of the cutting head assembly (100) over about 190 degrees about the axis of the connecting gear (220).
- the cutting head assembly (100) may be rotated about the axis of the connecting gear (220) so as to maintain engagement with the mine wall (1000) as illustrated by Figure 15. It will be appreciated that the degree to which the cutting head assembly (100) may be rotated about the axis of the connecting gear (220) is dependent on the cutter head assembly (100) size relative to the miner body (200).
- the drive gear (24) transmits a feed force from the miner body (200) to the cutting head assembly (100) which is intended to drive progression of the cutting head assembly (100) and the miner body (200) through a mine shaft created in the mine wall (1000) as illustrated by Figure 15.
- the feed force is resultant of a mass of the miner body (200) applied to the cutting head assembly (100).
- a maximum feed force that may be applied is roughly equal to the maximum weight of the miner body (200).
- the feed force applied to the mine wall (1000) via the cutting head assembly (100) may depend on the weight of the miner body (200) being picked up or slacked off via an arrangement of pulleys, drawworks and the like connected and controlled by the mining system (300) in order to engage the mine wall (1000) and progress the cutting head assembly (100) through the created mine shaft.
- feed force may be interchangeable with other terms such as “slack off force” or “drive force”, so as the term references the force applied to drive/progress the cutting head assembly (100).
- the feed force drives the cutting head assembly (100) to engage the mine wall (1000) and subsequently permit the primary breakage mechanism (10) to engage the mine wall (1000) by actuation.
- the combination of the feed force and the percussive force of the primary breakage mechanism (10) permit the cutting head assembly (100) to engage and maintain engagement with the mine wall (1000).
- the miner body (200) may not necessarily be required to apply the feed force if the mine wall (1000) is not initially engaged with the cutting head assembly (100) at a “horizontal” position, as is illustrated by Figures 12, 13 and 17 to 19.
- the primary breakage mechanism (10) is actuated to apply to the mine wall (1000) the breakage force to break rock fragments from and excavate the mine wall (1000).
- the primary breakage mechanism (10) actuates so as to excavate the mine wall (1000) via percussive forces
- these percussive forces combined with the feed force may generate p-wave energy exiting at the or each primary cutters (11) or the one or more cutting elements (12) to further induce tensile failure of the mine wall (1000).
- the feed force from the miner body (200) to the cutting head assembly (100) may be up to a total weight of the miner body (200) at the primary breakage mechanism (10).
- the feed force that may be slacked off and imparted via the cutting head assembly (100) at the primary breakage mechanism (10) is up to 2 tonnes.
- the housing (23) of the cutting head assembly (100) is sealed such that the cutting head assembly (100) is operable when submerged in a fluid or slurry.
- sealed areas of the cutting head assembly (100) may include any one or more of the housing (23), the fluid passageway (22), and the primary (10) and the secondary (30) breakage mechanisms. In this way, the cutting head assembly (100) is operable in an environment where the mine wall (1000) and the subsequently resultant mine shaft is filled with the fluid or slurry.
- the fluid or slurry in which the cutting head assembly (100) may operate could be, for example, water or a bentonite clay/water mix depending on the geology of the mine wall (1000) and water table conditions of the environment of the mine wall (1000).
- the cutting head assembly communicates with a control system which actuates and monitors the primary (40) and secondary (50) actuators of the primary (10) and secondary (30) breakage mechanisms.
- the cutting head assembly may communicate with a control system which monitor the hydraulic pressures and flows in each of the primary (40) and secondary (50) actuator.
- the control system comprises a remote control interface supporting remote monitoring and control of the primary (40) and secondary (50) actuators of the primary (10) and secondary (30) breakage mechanisms.
- the control system may be programmable so as to automate the actuation of the primary (40) and secondary (50) actuators reactive of their monitored activity.
- the control system, and subsequently the remote control interface could be located at surface level and outside of the resultant mine shaft created during excavation of the mine wall (1000) and include communication infrastructure and equipment to support communication with one or more communication interface modules on board the cutting head assembly. Suitable communication infrastructure and equipment would be known to a person skilled in the art.
- the cutting head assembly (100) may be operated and monitored at a safe distance from the mine wall (1000) without placing an operator in any hazardous situation resultant of excavating the mine wall (1000).
- the cutting head assembly (100) may further comprise an adapter plate (60) configured to be removably attachable to the housing (23).
- the adapter plate (60) comprises one or more lifting means (61) enabling handling and transportation of the cutting head assembly (100). It will be appreciated, although not illustrated, that the adapter plate (60) may cover and protect the outlet (26) so as to prevent ingress of any unwanted particles of substances or debris during handling or transportation of the cutting head assembly (100).
- the mining system (300) (referring to any one of Figures 12 to 14) is downstream of the cutting head assembly (100) to receive rock fragments from the cutting head assembly (100).
- the mining system (300) is a vertical mining system which creates a vertical to sub vertical mine shaft by utilising the above described cutting head assembly (100) to excavate the mine wall (1000).
- a vertical mining system (300), when used with the cutting head assembly (100), may permit access to smaller scale mineral deposits without the need for expansive excavation such as those employed in either of explosive excavation or mechanical rock fragmentation excavation.
- the mining system (300) is a mining system capable of creating a near-horizontal, subhorizontal or angled mine shafts or tunnels by utilising the above described cutting head assembly (100) to excavate the mine wall (100).
- the described cutting head assembly (100), in this alternative case, may permit access to mineral deposits that largely span in a horizontal or nearhorizontal orientation. As will be appreciated by the disclosure of the above two cases, the cutting head assembly (100) may be utilised to create an angled mine shaft.
- the vertical mining system (300) illustrated in any one of Figures 12 to 16 may be a closed loop mining system comprising a base carrier (310) such as a hydromill or trench cutter (illustrated), a solid separation and sorting unit (320), a mineral processing unit (not shown), tailings and waste integration unit (not shown) and a filling system (not shown).
- the composition of the closed loop mining system is preferentially modular such that the system is easy to commission and decommission, and is easily transported to and from a site.
- the base carrier (310) may comprise a hydromill or trench cutter, it is possible that other types of base carrier (310) may be used.
- the base carrier (310) may be a duty cycle crane (not shown) configured for use in the vertical mining system (300).
- the base carrier (310) may be any suitable type of base carrier which is selected to excavate rock fragments from the mine wall (1000) to create the resultant mine shaft in a vertical, sub-vertical or near-vertical orientation. Suitable types of base carrier (310) would be readily available and typically used in the foundation industry.
- a suitable base carrier (310) is a base carrier (310) having a capacity to reach depths of, for example, 250m.
- the base carrier (310) comprises control lines, hoses and the drawworks cables necessary to supply the hydraulics, electrical power and the fluids utilised to operate the miner body (200) and subsequently the cutter head assembly (100).
- the drawworks cables may be spooled in drums located on the base carrier (310) and is used to support the weight of the miner body (200) and subsequently the cutter head assembly (100).
- the above described feed force may be a force which results from “slacking off’ or “picking up” the miner body (200) as is imparted by the drawworks cables of the base carrier (310).
- control system and the remote control interface may be located at the base carrier (310) for actuating and monitoring the primary (40) and secondary (50) actuators of the primary (10) and secondary (30) breakage mechanisms.
- the miner body (200) operates in conjunction with the cutting head assembly (100).
- the miner body (200) includes the suction pump (210) centrally disposed between one or more pairs of steering plates (240) and one or more crawler tracks (250), the connecting gear (220) disposed on an underside of the miner body (200) concealing the conduit (230), and a hoist mechanism (260) disposed on a topside of the miner body (200).
- the one or more pairs of steering plates (240) operate in combination with the one or more crawler tracks (250) and the hoist mechanism (260) to follow the excavation of the mine wall (1000).
- the hoist mechanism (260) connects the miner body (200) to the base carrier (310) via the drawworks cables, the control lines and hoses of the base carrier (310). It will be appreciated that the hoist mechanism (260) coupled with the drawworks cables act so as to provide the feed force from the miner body (200) to the cutter head assembly (100).
- the hoist mechanism (260) in one embodiment, comprises a level wind system to help maintain spooling of wire into a hoist drum.
- the steering plates (240) in one embodiment, may comprise one or more steering actuators for moving the steering plates (240) about an axis so as to enable the steering plates (240) to contact walls of the excavated mine shaft. In certain embodiments, the actuators are able to retract the steering plates (240) away from the walls of the excavated mine shaft to assist in retrieval of the miner body (200) and thus the cutting head assembly (100) from the excavated mine shaft.
- the steering plates (240) may also function so as to lock the miner body (200) at a position in the mine shaft, and thus position the cutter head assembly (100) allowing the feed force from the drive (24) and/or swing (27) gears to engage/excavate the mine wall (1000) by actuation of the primary rock breakage mechanism (10). It will be appreciated that with the steering plates (240) locked and engagement of the mine wall (1000) for excavation, the steering plates (240) advantageously absorb reactive forces created by the percussive force of the primary breakage mechanism (10).
- the steering plates (240) operate in sub-horizontal positions to drive the miner body (200) and thus the cutting head assembly (100) forward, via the feed force, in the required direction.
- the connecting gear (220) may comprise a drive motor for the connecting gear (220) so as to impart drive on the gear (220) and subsequently rotate the cutting head assembly (100) about the axis of the connecting gear (220) via the swing gear (27).
- the drive motor rotates the cutting head assembly (100) about the axis of the connecting gear (220) illustrated by dashed lines X-X.
- Rotation of the cutting head assembly (100) about the axis as shown allows the actuation of the primary (10) and secondary (30) breakage mechanisms to mine the mine wall (1000) so as to permit drive of the cutting head assembly (100) and subsequently the miner body (200) through the resultant mine shaft. It will be appreciated that in this way, the rotation of the cutting head assembly (100) about the axis of the connecting gear (220) clears the mine shaft so as to allow progression of the cutting head assembly (100) via the feed force applied by the miner body (200).
- An exemplary method by which the cutting head assembly (100) of any one of the above embodiments excavates rock fragments from the mine wall (1000), may include the steps of:
- the cutting head assembly (100) is also particularly designed such that it can be detached from the miner body (200) in a modular manner. That is to say, one or more cutting head assemblies (100) with various primary cutters (11), cutting elements (12) and/or secondary cutters (31) may easily be attached and detached from the miner body (200) during excavation of the mine wall (1000). This is particularly advantageous if the cutting head assembly (100) or any one of the primary cutters (11), cutting elements (12) and/or secondary cutters (31), require replacement or exchange in response to the mine wall (1000) geology or due to damage.
- the cutting head assembly (100) may exploit a number of factors in order to achieve effective rock breakage in the mine wall (1000).
- the arrangement of the primary cutters (11) and/or the cutting elements (12) of the primary breakage mechanism (10) may advantageously allow the cutting head assembly (100) to combine the feed force supplied by the miner body (200) and the percussive force applied by the primary breakage mechanism (10) to exploit weaknesses of hard rock and ore bodies whilst minimising wastage whilst mining the wall (1000) due to the predictable size of the resultant reduced size rock fragments for improved downstream rock fragment processing.
- a further advantage of the cutting head assembly (100) is that it suits use in a vertical mining system (300). In this way the mine wall (1000) and the resultant mine shaft is excavated vertically to sub vertically (i.e. sub horizontally), depending on geological conditions of the mine wall (1000), thus advantageously being economical when targeting smaller scale mineral deposits and minimising environmental footprint.
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Earth Drilling (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP22865952.0A EP4399368A1 (en) | 2021-09-10 | 2022-09-09 | A cutting head assembly |
AU2022343024A AU2022343024A1 (en) | 2021-09-10 | 2022-09-09 | A cutting head assembly |
CA3231721A CA3231721A1 (en) | 2021-09-10 | 2022-09-09 | A cutting head assembly |
US18/690,497 US20240309761A1 (en) | 2021-09-10 | 2022-09-09 | A cutting head assembly |
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AU2021902939A AU2021902939A0 (en) | 2021-09-10 | A cutting head assembly | |
AU2021902939 | 2021-09-10 |
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WO2023035038A1 true WO2023035038A1 (en) | 2023-03-16 |
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PCT/AU2022/051092 WO2023035038A1 (en) | 2021-09-10 | 2022-09-09 | A cutting head assembly |
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US (1) | US20240309761A1 (en) |
EP (1) | EP4399368A1 (en) |
AU (1) | AU2022343024A1 (en) |
CA (1) | CA3231721A1 (en) |
WO (1) | WO2023035038A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4140346A (en) * | 1976-06-28 | 1979-02-20 | Shell Oil Company | Cavity mining minerals from subsurface deposit |
US5022789A (en) * | 1987-11-18 | 1991-06-11 | Shimizu Construction Co., Ltd. | Method and machine for constructing shafts |
US6405812B1 (en) * | 1996-07-02 | 2002-06-18 | Wirth Maschinen-Und Bohrgerate-Fabrik Gmbh | Drilling tool for the air-lifting process |
WO2020121212A1 (en) * | 2018-12-12 | 2020-06-18 | Master Sinkers (Pty) Ltd | Cutter head arrangement |
-
2022
- 2022-09-09 CA CA3231721A patent/CA3231721A1/en active Pending
- 2022-09-09 US US18/690,497 patent/US20240309761A1/en active Pending
- 2022-09-09 EP EP22865952.0A patent/EP4399368A1/en active Pending
- 2022-09-09 WO PCT/AU2022/051092 patent/WO2023035038A1/en active Application Filing
- 2022-09-09 AU AU2022343024A patent/AU2022343024A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4140346A (en) * | 1976-06-28 | 1979-02-20 | Shell Oil Company | Cavity mining minerals from subsurface deposit |
US5022789A (en) * | 1987-11-18 | 1991-06-11 | Shimizu Construction Co., Ltd. | Method and machine for constructing shafts |
US6405812B1 (en) * | 1996-07-02 | 2002-06-18 | Wirth Maschinen-Und Bohrgerate-Fabrik Gmbh | Drilling tool for the air-lifting process |
WO2020121212A1 (en) * | 2018-12-12 | 2020-06-18 | Master Sinkers (Pty) Ltd | Cutter head arrangement |
Also Published As
Publication number | Publication date |
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AU2022343024A1 (en) | 2024-05-02 |
EP4399368A1 (en) | 2024-07-17 |
CA3231721A1 (en) | 2023-03-16 |
US20240309761A1 (en) | 2024-09-19 |
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