CN113885082A - Kaolin-like gold ore deep detection method - Google Patents
Kaolin-like gold ore deep detection method Download PDFInfo
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- CN113885082A CN113885082A CN202110836202.XA CN202110836202A CN113885082A CN 113885082 A CN113885082 A CN 113885082A CN 202110836202 A CN202110836202 A CN 202110836202A CN 113885082 A CN113885082 A CN 113885082A
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 239000010931 gold Substances 0.000 title claims abstract description 47
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 47
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 238000005259 measurement Methods 0.000 claims abstract description 34
- 230000033558 biomineral tissue development Effects 0.000 claims abstract description 28
- 238000000034 method Methods 0.000 claims abstract description 28
- 230000004075 alteration Effects 0.000 claims abstract description 17
- 238000011161 development Methods 0.000 claims abstract description 11
- 230000018109 developmental process Effects 0.000 claims abstract description 11
- 230000007480 spreading Effects 0.000 claims abstract description 9
- 230000005284 excitation Effects 0.000 claims abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 10
- 239000011707 mineral Substances 0.000 claims description 10
- 239000011435 rock Substances 0.000 claims description 10
- 230000002349 favourable effect Effects 0.000 claims description 7
- 229910052976 metal sulfide Inorganic materials 0.000 claims description 6
- 210000003462 vein Anatomy 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000013467 fragmentation Methods 0.000 claims description 2
- 238000006062 fragmentation reaction Methods 0.000 claims description 2
- 238000010276 construction Methods 0.000 claims 1
- 238000000691 measurement method Methods 0.000 claims 1
- 208000010392 Bone Fractures Diseases 0.000 description 6
- 206010017076 Fracture Diseases 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000005065 mining Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000011835 investigation Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000001089 mineralizing effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
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- 230000007704 transition Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/083—Controlled source electromagnetic [CSEM] surveying
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Abstract
The invention discloses a method for detecting deep part of gold ore of similar karn type, which comprises the steps of carrying out geological survey of ore deposit, finding out ore control factors and ore body spreading rules, and studying and judging the development potential of deep ore body; carrying out deep geophysical measurement to obtain the information of the weak zone of the deep structure and define the deep ore control structure part; carrying out multi-polar distance excitation linkage measurement to obtain deep mineralization alteration zone information and judging whether mineralization exists in the deep part; and (4) predicting deep ore bodies, and performing drilling and checking to obtain real resources. Compared with the prior art, the method combines a plurality of geophysical detection means, geochemical detection means and geological means in order, realizes the effective detection of gold ore bodies with the kilometer depth of the Carlin-like gold deposit, enriches the detection system, improves the detection probability, reduces the detection cost and has popularization and application values.
Description
Technical Field
The invention relates to the field of gold ore geological exploration, in particular to a Kaolin-like gold ore deep detection method.
Background
At present, under the background that an exploration target area is shifted from a shallow surface to a deep part, an old area is dedicated to a new area, and an exposed area is shifted to a covered area, the traditional geological and mineral map filling method is limited, and the comprehensive geophysical and geochemical method plays an important role in gold mine resource exploration. The ore body of the ore is mainly produced in a slightly-deteriorated sedimentary rock system and is mostly seen in broken slate. The ore-bearing limestone of the traditional Carlin type gold ore is not obviously seen, so that stratum ore control factors are lacked. The position distribution of gold ore body is controlled by secondary fracture structure, and the ore forming part is generally accompanied with ore body alteration phenomenon, but the content of sulfide is lower.
The traditional identification method for the Carlin-like gold mine mainly utilizes earth surface outcrop observation, ground power-induced escalator work, water system sediment and soil geochemistry to determine abnormity. For example, earth outcrop observation uses visual inspection to look for outcrops or to delineate gold ore bodies by identification of their surrounding rocks and identification of structural markers. The common method for determining the gold ore body in the ground power-induced escalator operating circle by the geophysical exploration technology is generally to identify the low-resistivity and high-polarization characteristics of the power-induced midbody, and the common method for determining the gold ore body in the water system sediment and the soil geochemical circle is generally to identify the abnormal high-value range of gold and associated elements.
The existing method has certain limitations, for example, the earth surface outcrop observation method can not be applied if a certain coverage stratum exists; in ground power-induced elevator operation, because the depth of the buried depth of an ore body is increased, the power-induced abnormality caused by metal sulfides accompanying a gold ore body is weak, the ore body buried deeper cannot be effectively detected by adopting the ground power-induced operation, and the abnormal information with the depth concept cannot be provided.
Disclosure of Invention
The invention aims to solve the problems and provide a method for detecting the deep part of a gold mine similar to a karn type.
The invention realizes the purpose through the following technical scheme:
the invention comprises the following steps:
s1: carrying out geological survey of ore deposit, finding out ore control factors and ore body spreading rules, and studying and judging the development potential of deep ore bodies;
s2: carrying out deep geophysical measurement to obtain the information of the weak zone of the deep structure and define the deep ore control structure part;
s3: carrying out multi-polar distance excitation linkage measurement to obtain deep mineralization alteration zone information and judging whether mineralization exists in the deep part;
s4: and (4) predicting deep ore bodies, and performing drilling and checking to obtain real resources.
Further, in the step S1, the geological survey of mineral deposits requires investigation of the basic characteristics of rock mass and rock vein distribution if rock mass exists in the region, such as stratigraphic distribution, intergroup interface, structural morphology, fault system, interlaminar fragmentation system, alteration combination and alteration zonal.
The geological survey of the mineral deposit comprises geological elements directly related to mineralization, and the geological elements comprise a mineral guide structure and a mineral control structure.
Further, the method for deep geophysical survey in step S2 includes audio magnetotelluric measurement or controllable source audio magnetotelluric measurement, where the audio magnetotelluric measurement or controllable source audio magnetotelluric measurement is used to identify a deep fault system, present contact relations among the geological bodies at the deep part, and determine that low resistance anomalies composed of weak zones of the structure are favorable sites for mineralization; wherein if the area belongs to the area without human and industrial interference, the audio magnetotelluric measurement can be selected, if similar interference exists, the audio magnetotelluric measurement of the controllable source is selected.
Preferably, the distance between the audio magnetotelluric or controllable source audio magnetotelluric measurement points is controlled to be 20-40 m.
Further, in the step S3, the multi-pole-distance laser cross-section measurement is performed, the metal sulfide change position is determined according to the polarization rate curve reverse intersection point obtained by the laser cross-section measurement, so as to determine whether the metal sulfide change related to the occurrence position of the gold ore body occurs in the mineralization favorable part searched in the step S2, and the laser cross-section measurement is further adopted to be not less than 2 pole distances, which is beneficial to determining the authenticity and the deep extension tendency of the gold ore body.
Preferably, the distance between the measuring points of the induced electrical cross-section is controlled to be 20m, and the mineralizing beneficial parts determined in the step S2 are encrypted and measured.
Furthermore, in the step S4, the drill holes are arranged according to the depth and the position provided in the step S3 and in combination with geological knowledge, so that the exploration success rate is effectively improved, and the exploration cost is reduced.
The invention has the beneficial effects that:
the invention is a kind of card forest type gold mine deep detection method, compared with prior art, the invention combines the detection means of many units geophysical, geochemical and geological means in order, have realized the gold mine body of the card forest type gold deposit kilometer depth of the effective detection, have enriched the investigation system, has improved the exploration probability, has reduced the exploration cost, have value popularized and applied.
Drawings
FIG. 1 is a longitudinal projection view of the spreading pattern of an ore body of a gold deposit on Zihai in an embodiment of the present invention;
FIG. 2 is a longitudinal projection view of the spreading pattern of the ore body of the gold deposit in Zihai according to the embodiment of the present invention;
FIG. 3 is a controlled source audio magnetotelluric anomaly map of a gold deposit in Zihai according to an embodiment of the present invention;
fig. 4 is a 16-line comprehensive geophysical prospecting anomaly map of the gold mine area in village in the embodiment of the invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1-4: step (1), carrying out geological survey of ore deposit, finding out ore control factors and ore body spreading rules, and studying and judging deep ore body development potential.
In the aspect of an ore forming rule or an ore forming theory, the indication of the possibility of ore forming in the deep part is a basic premise for carrying out deep detection on the gold polymetallic ore deposit. Therefore, the development of systematic geological survey and research of ore deposit is an essential step, and on the basis of fully collecting and utilizing the existing data of the ore deposit, the detailed geological survey is developed on the gold polymetallic ore deposit to be detected deeply, the ore control factors and the ore body distribution rule are found out, and the deep ore body development potential is comprehensively researched and judged.
The geological survey of the ore deposit comprises stratum spread, intergroup interfaces, ore control structures, fault systems, interlayer crushing systems, alteration combinations, alteration zones, rock mass/vein body spread and three-dimensional spread forms of the ore body within the known mineralization range of the ore deposit. In particular geological elements directly related to mineralization, such as lead formation, control formation, and mineral-bearing horizon.
If the conclusion of the step (1) shows that the deep part has the mineralization potential, the next step can be carried out; if the conclusion of the step (1) shows that the deep part does not have the mineralization potential, the deep part detection needs to be treated with caution or stopped.
Step (2), carrying out deep geophysical measurement to obtain the weak zone information of the deep structure, and defining the deep ore control structure part;
the structure is an important control factor of the Carlin-like gold mine, and the spatial position and the spreading form of an ore deposit are often directly determined, so that deep geophysical measurement is carried out, the fracture fold form of shallow ore control and the development form of a fault in the deep part are found out, and the basic premise of deep development mineralization is provided. The Carlin-like gold deposit is often developed at the transition part from brittle fracture to brittle fracture, namely, the interlayer fault and the wrinkle anticline core part of the wrinkle structure are favorable parts for the development of the gold polymetallic ore body and are the key of deep detection.
In shallow coverage areas, methods of deep geophysical measurements include Audio Magnetotelluric (AMT) and Controlled Source Audio Magnetotelluric (CSAMT) measurements. The electromagnetic sounding method is very sensitive to underground low-resistance fracture structures, has high transverse resolution, positions the working direction to search for ore holding structures and mineralization alteration zones, and can initially provide favorable positions for gold ore occurrence by searching structural weak zones and secondary first-level fracture and crack intensive distribution areas through electromagnetic exploration, wherein the depth can reach more than 1000 meters;
the method comprises the steps of measuring audio frequency magnetotelluric (AMT) and controllable source audio frequency magnetotelluric (CSAMT), carrying out geophysical survey with large scale and high precision in a mining area range, and preferably selecting a controllable source audio frequency magnetotelluric method when the scale of the audio frequency magnetotelluric measurement is not more than 50m in point distance, such as electromagnetic interference or human interference in the mining area.
Preferably, deep geophysical measurement data interpretation is carried out, the fold form and the deep spreading characteristics of a fault system in a deep part are found out in a semi-quantitative mode, a deep part structure three-dimensional model is built, and the spatial position of possible extension/development of a deep ore body is predicted.
If the step (2) shows that the fault system development and the shallow part have consistency, the next step can be carried out; if the step (2) indicates that the deep volcanic mechanism and the fault system do not exist, the deep detection needs to be carefully treated or stopped.
(3) Carrying out multi-polar distance excitation linkage measurement to obtain deep mineralization alteration zone information and judging whether mineralization exists in the deep part;
the induced electrical logging of part of the mining area shows that the high polarizability is usually shown at the strong alteration zone, the quartz vein and the boundary of the geologic body, and the surrounding rock alteration of the beneficial position of the affected ore is judged according to the polarizability parameters, so that the affected position of the ore body is accurately searched.
The excitation combined profile method can provide two resistivity/apparent polarizability curves, and the two curves are matched, particularly the position and the tendency of the polarizer can be accurately determined by the characteristic that the excitation is combined to profile different polar distances corresponding to different depth information.
And (3) according to the ore body spreading rule in the step (1), integrating the deep geophysical measurement result in the step (2), predicting a target area at the periphery of the known ore deposit, carrying out measurement by an induced polarization combined section method, obtaining deep gold mineralization information, and judging whether gold mineralization exists in the deep part.
Distribution of the induced polarization anomaly is often related to mineralization alteration and metal sulfide enrichment positions, but only qualitative reaction deep gold mineralization information can be achieved, and quantitative reaction deep ore body positions cannot be achieved, and comprehensive prediction and positioning need to be conducted by combining knowledge of the step (1) and the step (2).
Comprehensively researching and analyzing the deep ore control structure part defined in the step (1) and the step (2); the pointed part of the deep gold multi-metal mineralization information in the step (3) is judged to be the deep gold mineralization information; predicting the development part of deep gold polymetallic ore body. And (4) implementing deep drilling engineering, checking deep gold polymetallic ore bodies and realizing deep ore finding breakthrough.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. 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 (8)
1. A karelin-like gold ore deep detection method is characterized by comprising the following steps:
s1: carrying out geological survey of ore deposit, finding out ore control factors and ore body spreading rules, and studying and judging the development potential of deep ore bodies;
s2: carrying out deep geophysical measurement to obtain the information of the weak zone of the deep structure and define the deep ore control structure part;
s3: carrying out multi-polar distance excitation linkage measurement to obtain deep mineralization alteration zone information and judging whether mineralization exists in the deep part;
s4: and (4) predicting deep ore bodies, and performing drilling and checking to obtain real resources.
2. The method according to claim 1, wherein the method comprises the following steps: in the step S1, the mineral geologic survey needs to investigate the basic characteristics of rock mass and rock vein spread if rock mass exists in the region, such as the formation spread, intergroup interface, structural morphology, fault system, interlaminar fragmentation system, alteration combination and alteration zonal in the known mineralization range.
3. The method for detecting the deep part of the gold mine of the karelin-like type according to claim 2, characterized in that: the geological survey of the mineral deposit comprises geological elements directly related to mineralization, and the geological elements comprise a mineral guide structure and a mineral control structure.
4. The method according to claim 1, wherein the method comprises the following steps: the deep geophysical measurement method in the step S2 comprises audio magnetotelluric or controllable source audio magnetotelluric measurement, wherein the audio magnetotelluric or controllable source audio magnetotelluric measurement is used for identifying a deep fault system, presenting contact relations of geologic bodies in each deep part and determining that low-resistance abnormity consisting of weak construction zones is a favorable position for mineralization; wherein if the area belongs to the area without human and industrial interference, the audio magnetotelluric measurement can be selected, if similar interference exists, the audio magnetotelluric measurement of the controllable source is selected.
5. The method according to claim 4, wherein the method comprises the following steps: the distance between the audio magnetotelluric or controllable source audio magnetotelluric measurement points is controlled to be 20-40 m.
6. The method according to claim 1, wherein the method comprises the following steps: and in the step S3, multi-polar distance laser cross-section measurement is carried out, the metal sulfide alteration position is determined according to the inverse intersection point of the polarizability curve obtained by the laser cross-section measurement, whether the metal sulfide alteration related to the occurrence position of the gold ore body occurs in the mineralization favorable part searched in the step S2 is judged, and the authenticity and the deep extension tendency of the gold ore body are judged by further adopting the laser cross-section measurement to be not less than 2 polar distances.
7. The method according to claim 6, wherein the deep portion of the gold ore is a karelin-like gold ore: the distance between the points of the induced electrical cross-section measurement should be controlled to be 20m, and the mineralization favorable part determined in the step S2 should be measured in an encrypted manner.
8. The method according to claim 6, wherein the deep portion of the gold ore is a karelin-like gold ore: in the step S4, the drill holes are arranged according to the depth and the position provided by the step S3 and combined with geological knowledge, so that the exploration success probability is effectively improved, and the exploration cost is reduced.
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| CN117471546A (en) * | 2023-10-31 | 2024-01-30 | 山东省地质矿产勘查开发局第六地质大队(山东省第六地质矿产勘查院) | Black rock-based gold ore prospecting method |
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