CN115539045A - Mining method of open-pit mine - Google Patents
Mining method of open-pit mine Download PDFInfo
- Publication number
- CN115539045A CN115539045A CN202110734861.2A CN202110734861A CN115539045A CN 115539045 A CN115539045 A CN 115539045A CN 202110734861 A CN202110734861 A CN 202110734861A CN 115539045 A CN115539045 A CN 115539045A
- Authority
- CN
- China
- Prior art keywords
- ore
- percent
- blasting
- blast hole
- grade
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005065 mining Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005422 blasting Methods 0.000 claims abstract description 25
- 239000011435 rock Substances 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 239000010949 copper Substances 0.000 claims description 42
- 229910052802 copper Inorganic materials 0.000 claims description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 31
- 239000010931 gold Substances 0.000 claims description 22
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 19
- 229910052737 gold Inorganic materials 0.000 claims description 19
- 238000005070 sampling Methods 0.000 claims description 14
- 239000010878 waste rock Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 8
- 238000011068 loading method Methods 0.000 claims description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 2
- 238000010790 dilution Methods 0.000 abstract description 6
- 239000012895 dilution Substances 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 238000004880 explosion Methods 0.000 description 13
- 230000008901 benefit Effects 0.000 description 11
- 238000009826 distribution Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 238000005553 drilling Methods 0.000 description 5
- 238000007790 scraping Methods 0.000 description 5
- 238000004080 punching Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005188 flotation Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Images
Classifications
-
- 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
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/02—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells by mechanically taking samples of the soil
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
- F42D3/04—Particular applications of blasting techniques for rock blasting
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Soil Sciences (AREA)
- Remote Sensing (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a mining method of an open-pit mine, which comprises the steps of integrally perforating a blasting pile of the open-pit mine, carrying out secondary ore circling on the blasting pile after a test result is obtained, optimizing a blasting sequence according to different types of ores or waste rocks and combining a blasting free surface, carrying out regional blasting according to the blasting sequence to achieve the aim of separate blasting, and creating conditions for separate shoveling and sub-packaging so as to reduce the mining loss and dilution rate.
Description
Technical Field
The invention relates to the technical field of open-pit mining, in particular to a mining method of an open-pit mine.
Background
Open-cast mining is a process of removing a covering on an ore body to obtain required minerals, generally comprises the operation processes of perforation, blasting, mining and loading, transportation, dumping and the like, and has the advantages of full resource utilization, high recovery rate, low dilution rate and suitability for large-scale mechanical construction.
The super-huge type aurichalcopyrite is a typical high-sulfidization type shallow low-temperature hydrothermal deposit, presents the distribution characteristic of 'top gold and bottom copper', the top aurichalcopyrite is added in an oxidation zone and consists of a main ore body and a plurality of small ore bodies, and the aurichalcopyrite is basically consumed after being mined for years; the copper ore body exists in the original zone and consists of a main ore body and a plurality of small ore bodies, the main ore body is an irregular huge lens body, low-grade ore bodies and waste rocks are clamped in the main ore body, the mineralization continuity is poor, the shape is complex, the general trend is 320 degrees, the main ore body tends to the north east, the middle shallow part of the inclination angle is 10-20 degrees, the middle deep part is 15-30 degrees, the main ore body is distributed in a right-shaped side row on the section, the side camber angle is about 15-35 degrees, the main ore body is distributed on 27-16 lines, the length is 1200m, the width is 1100m, and the spread area is 1.40km2. The main part of the ore body is distributed in the interval of 19-8 lines, the length is 750m, the width is 850m, and the distribution elevation is 650-50 m, and the ore body is an irregular 'column-shaped body' with the upper part being wide and the lower part being narrow and leaning towards the south and west, and part of small ore body appears in a high-standard non-oxidized area or the edge part of the main ore body, so that the whole distribution of the copper ore body is relatively complex.
The engineering mesh of the mine production resource reserves model reaches 25m (trend) multiplied by 50m (trend), the local mesh reaches 25m (trend) multiplied by 25m (trend), but the ore body is complicated to exist, the engineering mesh of the ascertained resource reserves level can not control the ore body, the ore body is divided into various types according to the production requirement, the difficulty of loss and dilution management is brought by using the whole-penetration whole-explosion technology (namely, a perforated pile is used for whole explosion), and the loss and dilution rate is increased.
If the mining method that the direction is parallel to the advancing direction of the working slope and the mining method that the ore bodies with different lithology are respectively blasted and shoveled and the small blocks are cut is adopted, the separate blasting and separate mining are carried out. In the mining process, the method easily causes the loss of ore body resources, ores and rocks are mixed into a crushing production system more or less, so that products are unqualified, and particularly, the position of the narrow-strip ore body is not beneficial to the quality matching utilization of resources. Secondly, the root is very easy to appear at ore rock juncture position and the shovel dress equipment needs frequent removal, has very big influence to equipment efficiency. Thirdly, the step flatness is not easy to control by adopting a method of explosive-separation mining.
Therefore, in order to reduce the loss-depletion rate and improve the mining management level, a more reasonable technical scheme needs to be provided to solve the technical problems.
Disclosure of Invention
In order to solve the existing problems, the invention provides a mining method which is applicable to complex ore bodies which are not found in detail and divides open pit mines of various ore types.
The mining method of the open-pit mine comprises the following steps:
s1, designing blast hole mesh parameters of a mining area according to the type and the position of a mineral to form a designed blast hole coordinate;
s2, setting out and constructing a down-the-hole drill according to the designed blast hole coordinate;
s3, sampling rock powder in all blast holes, and drawing a blast hole sketch;
s4, testing the taken rock powder, and filling a test result to the position close to the blast hole position of the blast hole sketch;
s5, carrying out secondary ore circling on the blast hole sketch according to the test result, and carrying out resource estimation;
s6, dividing the boundary line of the ore rock for the mining area on site according to the blast hole sketch;
s7, optimizing the blasting sequence according to the direction of the free surface of the mining area, performing regional blasting according to the blasting sequence, and respectively carrying out shovel loading and transportation to different grade ore storage regions or refuse dumps.
Preferably, in the step S1, the mesh parameters of the gold ore and waste rock area are 6m (pitch) × 5m (pitch), the mesh parameters of the copper ore area are 5.5m (pitch) × 4.5m (pitch), and the mesh parameters of the hard blasting hard area of the rock ore are 4.8m (pitch) × 3.8m (pitch).
Preferably, in the step S3, a "cross-shaped pull trench scraped surface sampling method" is used to sample the blast hole.
Preferably, the values of the circled ore in the step S5 are: high copper (containing gold) (the grade of 1,Cu is more than or equal to 0.40 percent), copper (containing gold) (2,0.40 percent > Cu grade is more than or equal to 0.30 percent), low copper (containing gold) (3,0.30 percent > Cu grade is more than or equal to 0.20 percent), low copper (4,0.20 percent > Cu grade is more than or equal to 0.15 percent), and barren rocks or gold ores (the grade of Au is more than or equal to 0.15 g/t).
Compared with the prior art, the invention has the beneficial effects that:
1. effectively reducing loss and dilution rate and improving economic benefit: the loss rate is reduced from 1.96 percent to 1.76 percent, and the amplitude is reduced by 0.3 percent; the depletion rate is reduced from 3.88 percent to 3.34 percent, and the reduction amplitude is 0.54 percent. The ore amount mined is 1550 ten thousand tons according to the 2021 year plan, the copper grade is 0.401%, the loss rate is reduced, the copper metal amount can be recycled and 186.46 tons, and about 1212 ten thousand yuan of economic benefit is generated (the copper price is calculated according to 65000 yuan/t); the depletion rate is reduced, the waste rock can be reduced to be mixed into 8.37 ten thousand tons, the treatment cost per ton of ore is 52 yuan/t after the waste rock enters a flotation plant, the cost can be reduced by about 435 yuan, and the total benefit can be generated by about 1647 yuan per year.
2. The working efficiency is effectively improved. Compared with the separate-penetrating separate-explosion technology, the whole-penetrating separate-explosion technology has the advantages that the efficiency is improved to a certain extent, the drilling machine is prevented from moving back and forth, the punching time is saved, and the punching efficiency is improved.
3. Reducing the exploration cost. For the ore body with serious branch composition, the prior engineering mesh degree of 25m (trend) × 50m (trend), and the local 25m (trend) × 25m (trend) can not find out the distribution condition of the ore body in detail, if the ore body is to be controlled completely, a huge exploration cost needs to be invested, the whole penetration fractional explosion technology is adopted to sample and test the blast holes, and then secondary ore circling is carried out, so that the shortage of the drilling engineering mesh degree can be made up.
Drawings
FIG. 1 is a flow chart of a mining method of the present invention;
FIG. 2 is a diagram showing the blast hole design of the present embodiment;
FIG. 3 is a sketch of a blast hole according to the present embodiment;
FIG. 4 is the result of the incremental assay of FIG. 3;
FIG. 5 is the addition of a circle of ore, resource reserve estimation, and ore boundaries of FIG. 4;
fig. 6 is the digitized image of fig. 5.
Detailed Description
The invention is described in further detail below with reference to the following detailed description and accompanying drawings:
referring to fig. 1, the mining method for a surface mine according to the embodiment includes the following steps:
s1, carrying out separate-pass and separate explosion in regions where all ores or waste rocks are planned to be pushed in according to the latest grade current situation diagram and the step grade distribution diagram by explosion managers in combination with an ore body space distribution rule, and carrying out whole-pass and separate explosion in regions where the ore rock distribution is complex and the like do not have separate-pass and separate explosion. The mine is blasted according to different mesh parameters of approximately gold ore, copper ore and waste rock areas, for example, the mesh parameters of the gold ore and waste rock areas are 6m (pitch) × 5m (row spacing), the general mesh parameters of the copper ore areas are 5.5m (pitch) × 4.5m (row spacing), and the mesh parameters of the hard blasting area of the rock ore are adjusted to be 4.8m (pitch) × 3.8m (row spacing). For example, the 556B2027 blasting pile is a medium-low grade copper ore body before designing the blast hole, the resource reserves are proved, the control network degree of the drilling engineering reaches 25m (strike) × 25m (trend), therefore, the blast hole network parameters are designed according to 5.5m (hole pitch) × 4.5m (row pitch), as shown in fig. 2.
S2, lofting by a measurer according to the coordinates of the designed blast hole; and (4) a perforating person constructs a down-the-hole drill according to the position of the blast hole, and keeps the rock powder intact, so that the pollution between samples is avoided.
S3, geological sampling personnel adopt a cross ditch-drawing face-scraping sampling method to sample the blast hole, 1 hole is sampled, when sampling is carried out, a triangular hoe is used for drawing a groove uniformly in a rock powder pile of the blast hole according to the cross shape, and the ditch-drawing must be drawn to the bottom, so that the exposed surface is taken as the standard. Evenly scraping rock powder on the wall of the groove by using a sample spoon, scraping 3-5 spoons from each surface of the groove, scraping 8 surfaces in total, loading the scraped rock powder into a clean sample bag from the bottom of the groove upwards and from inside to outside in the scraping sequence, then putting sample numbers, binding the sample bag to avoid polluting samples, and carrying out comparison research on single-surface and double-surface sampling of each groove, wherein the sample weight is more than 4kg. Meanwhile, drawing a blast hole sketch according to the position of the blast hole, as shown in figure 3, and filling relevant information such as sampling time, blast hole time, sampling personnel, engineering companies, sampling sites, blast hole numbers, blasting pile numbers, hole depths, hole directions, design hole numbers and the like.
S4, sending the taken blasting pile sample to a testing company for testing, filling the testing result below the blast hole position by a sampling person, wherein the digital band% is the copper ore grade, only the digital band% is the gold ore grade, and when the gold grade is less than 0.10g/t, the testing result does not need to be copied to a graph, and the grade is distinguished by painting, which is shown in figure 4.
S5, performing secondary ore circling on the blast hole sketch by geologists according to the blast hole test result, and circling to obtain (gold-containing) high copper (-1, cu grade is more than or equal to 0.40%), copper (containing gold) (2,0.40% > Cu grade is more than or equal to 0.30%), low copper (containing gold) (3,0.30% > Cu grade is more than or equal to 0.20%), low copper (-4,0.20% > Cu grade is more than or equal to 0.15%), and barren rock or gold ore (Au grade is more than or equal to 0.15 g/t). Referring to fig. 5, 556B2027 burst defines three areas, one is high copper, one is rock, and one is low copper, after the definition is completed, the blasthole sketch is digitized, resource estimation is performed on different types of ores, no estimation is performed on waste rocks (see fig. 6), and the estimation result of resource reserves is filled in the calculation result of IDS reserves in fig. 5.
And S6, dividing the ore rock boundary line of the blasting pile by geological personnel according to the blast hole draft on site.
S7, reasonably arranging the explosion separation sequence according to the direction of the free surface of the blasting pile, and preferentially blasting a-1 high-copper area as can be seen in figure 5, and carrying out shovel loading and transportation to a draw shaft or a factory selection; then blasting the waste rock area, and carrying out shovel loading and transportation to a dumping site; and blasting-4 low copper area, and transporting to low copper stacking area.
The invention provides a mining method which is applicable to complex ore bodies which are not found in detail and divides strip mines of various ore types, and the invention has the following advantages in the following aspects:
1. effectively reducing loss and dilution rate and improving economic benefit: the loss rate is reduced from 1.96 percent to 1.76 percent, and the amplitude is reduced by 0.3 percent; the depletion rate is reduced from 3.88 percent to 3.34 percent, and the reduction amplitude is 0.54 percent. The ore amount mined is 1550 ten thousand tons according to the 2021 year plan, the copper grade is 0.401%, the loss rate is reduced, the copper metal amount can be recycled and 186.46 tons, and about 1212 ten thousand yuan of economic benefit is generated (the copper price is calculated according to 65000 yuan/t); the depletion rate is reduced, the waste rock can be reduced to be mixed into 8.37 ten thousand tons, the treatment cost per ton of ore is 52 yuan/t after the waste rock enters a flotation plant, the cost can be reduced by about 435 yuan, and the total benefit can be generated by about 1647 yuan per year.
2. The working efficiency is effectively improved. Compared with the separate-penetrating separate-explosion technology, the whole-penetrating separate-explosion technology has the advantages that the efficiency is improved to a certain extent, the drilling machine is prevented from moving back and forth, the punching time is saved, and the punching efficiency is improved.
3. Reducing the exploration cost. For the ore body with serious branch composite, the existing engineering net degree of 25m (trend) × 50m (trend) and the local 25m (trend) × 25m (trend) can not find out the distribution condition of the ore body in detail, if the ore body is to be controlled completely, a huge amount of exploration cost needs to be invested, the whole penetration and separate explosion technology is adopted to carry out sampling test on blast holes, and then secondary ore enclosing is carried out, so that the shortage of the net degree of the drilling engineering can be made up.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A mining method of a surface mine is characterized by comprising the following steps:
s1, designing blast hole mesh parameters of a mining area according to the type and the position of a mineral to form a designed blast hole coordinate;
s2, setting out and constructing a down-the-hole drill according to the designed blast hole coordinate;
s3, sampling rock powder in all blast holes, and drawing a blast hole sketch;
s4, testing the taken rock powder, and filling a testing result to the position close to the blast hole position of the blast hole sketch;
s5, carrying out secondary ore circling on the blast hole sketch according to the test result, and carrying out resource estimation;
s6, dividing the boundary line of the ore rock in the mining area on site according to the blast hole sketch;
and S7, optimizing the blasting sequence according to the direction of the free surface of the ore area, performing regional blasting according to the blasting sequence, and respectively carrying out shovel loading and transportation to different grade ore storage regions or refuse dumps.
2. The mining method of the surface mine according to claim 1, wherein the parameters of the mesh of the gold ore and the waste rock area in the step S1 are 6m (pitch) x 5m (pitch), the parameters of the mesh of the copper ore area are 5.5m (pitch) x 4.5m (pitch), and the parameters of the mesh of the hard blasting hard area of the rock ore are 4.8m (pitch) x 3.8m (pitch).
3. The method of mining an open pit mine according to claim 1, wherein said step S3 comprises sampling said blastholes by "cross-trench scraped surface sampling".
4. The mining method of the surface mine according to claim 1, wherein the values of the circle mine in the step S5 are: high copper (containing gold) (the grade of 1, cu is more than or equal to 0.40 percent), copper (containing gold) (2,0.40 percent and more than the grade of Cu is more than or equal to 0.30 percent), low copper (containing gold) (3,0.30 percent and more than the grade of Cu is more than or equal to 0.20 percent), low copper (4,0.20 percent and more than the grade of Cu is more than or equal to 0.15 percent) and waste rock or gold ore (the grade of Au is more than or equal to 0.15 g/t).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110734861.2A CN115539045A (en) | 2021-06-30 | 2021-06-30 | Mining method of open-pit mine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110734861.2A CN115539045A (en) | 2021-06-30 | 2021-06-30 | Mining method of open-pit mine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115539045A true CN115539045A (en) | 2022-12-30 |
Family
ID=84705450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110734861.2A Pending CN115539045A (en) | 2021-06-30 | 2021-06-30 | Mining method of open-pit mine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115539045A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116537789A (en) * | 2023-05-31 | 2023-08-04 | 中国水利水电第三工程局有限公司 | Ore layered mining depletion loss control method under complex geological conditions |
-
2021
- 2021-06-30 CN CN202110734861.2A patent/CN115539045A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116537789A (en) * | 2023-05-31 | 2023-08-04 | 中国水利水电第三工程局有限公司 | Ore layered mining depletion loss control method under complex geological conditions |
| CN116537789B (en) * | 2023-05-31 | 2024-01-26 | 中国水利水电第三工程局有限公司 | Ore layered mining depletion loss control method under complex geological conditions |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10876403B2 (en) | Method for mining ultra-thick coal seam by utilizing goaf solid backfilling technique | |
| CN101967973B (en) | Open stope-caving combined mining method | |
| CN109209380A (en) | A kind of mine, which picks up, fills control recovery method | |
| CN104533416A (en) | Large-scale mechanized non-sill-pillar sub-level caving mining method for extremely thick ore body | |
| CN106869936A (en) | It is a kind of to be suitable to the surface mining new method of steep slope topography | |
| CN1178284A (en) | Open-air high-step mining method | |
| CN112177611A (en) | Method for mining inclined or steeply inclined hard thin ore body | |
| CN109458181A (en) | A kind of filling mining method of metallic ore across pitch full-seam mining | |
| Altiti et al. | Open pit mining | |
| CN106640080A (en) | Deep part high-stress environment self-stabilizing arched stope arrangement mining method | |
| Nasirov et al. | Development of algorithm for managing mineral resources of deposits | |
| CN115539045A (en) | Mining method of open-pit mine | |
| Marinin et al. | Blasting preparation for selective mining of complex structured ore deposition | |
| RU2524716C1 (en) | Strip mining of minerals including working of ore bodies in contact between ore and capping in sub-benches | |
| CN108952726A (en) | Have an opencast mining of the neighbouring step dislocation perforation method of medium-length hole blasting | |
| AO | Geology and mining: An introduction and overview | |
| Elbeblawi et al. | Surface mining technology | |
| Mirzekhanov et al. | Forward appraisal of potential gold content of dredge and sluice tailings dumps at placers in Russia’s Far East | |
| Talgamer et al. | Assessment of conditions and experience of technogenic placer dredging | |
| Ghose | Underground methods of extraction of thick coal seams—a global survey | |
| CN107762506A (en) | Based on falling ore deposit stage mineral building afterwards filling mining method | |
| CN107762509A (en) | A kind of method for improving mining efficiency | |
| Ali Elbeblawi et al. | Introduction to mining | |
| Bamber et al. | Reducing selectivity in narrow-vein mining through the integration of underground pre-concentration | |
| CN109630118A (en) | Mining method for steeply inclined unstable thin ore body |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |