CN114152995A - Rapid gold mine finding method suitable for high-cutting shallow coverage area of south Qinling mountain - Google Patents
Rapid gold mine finding method suitable for high-cutting shallow coverage area of south Qinling mountain Download PDFInfo
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- 239000010931 gold Substances 0.000 title claims abstract description 121
- 229910052737 gold Inorganic materials 0.000 title claims abstract description 114
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000002159 abnormal effect Effects 0.000 claims abstract description 129
- 239000002689 soil Substances 0.000 claims abstract description 68
- 229910052785 arsenic Inorganic materials 0.000 claims abstract description 62
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 claims abstract description 59
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- 238000007789 sealing Methods 0.000 claims description 3
- 230000003595 spectral effect Effects 0.000 claims 1
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 2
- VJRVSSUCOHZSHP-UHFFFAOYSA-N [As].[Au] Chemical compound [As].[Au] VJRVSSUCOHZSHP-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
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- 238000012545 processing Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000012163 sequencing technique Methods 0.000 description 2
- 238000009412 basement excavation Methods 0.000 description 1
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V8/00—Prospecting or detecting by optical means
- G01V8/02—Prospecting
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02A90/30—Assessment of water resources
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Abstract
The invention relates to a rapid gold mine finding method suitable for a high-cutting shallow-coverage area of the south Qinling mountain, which comprises the steps of firstly determining a gold mine finding target area, carrying out 1:1 ten thousand soil geochemical measurement work in the gold mine finding target area, classifying soil high-value points according to a unit element abnormal graph, carrying out basic analysis sample sampling according to a classification result and a portable spectrometer, delineating a mineralizer, laying an audio magnetotelluric depth measuring section in the direction perpendicular to the mineralizer, carrying out measurement along a section line, forming an AMT inversion result, determining the deep extension condition of the mineralizer, and finally carrying out deep verification on the mineralizer laying drill holes to finish the gold mine finding process. The invention introduces the soil high-value point to remove the soil result points with smaller gold and arsenic abnormal values, and utilizes the portable spectrometer to sample the basic analysis sample, so that the sampling process is more targeted, the sampling efficiency can be improved, and the rapid ore searching of the gold ore can be realized.
Description
Technical Field
The invention relates to the technical field of prospecting, in particular to a rapid gold mine prospecting method suitable for a high-cutting shallow-coverage area of the south Qinling mountain.
Background
Gold mineral resources in the south Qinling mountain area are rich, but the terrain is steep due to high cutting, and the coverage of the fourth line is serious, so that the method provides a challenge for the traditional ore finding method. The common technical means for finding the ores is to utilize chemical exploration scanning surface work and map filling work to obtain chemical exploration abnormity, sequencing and channel exploration disclosures, but the gold ores are different from non-ferrous metal ores which are easy to identify and relatively dependent on sample testing, and the arrangement positions of the samples are important for mining the gold ores.
Based on this, a fast gold mine prospecting method suitable for the high cutting shallow coverage area of the south Qinling mountain is needed.
Disclosure of Invention
The invention aims to provide a rapid gold mine prospecting method suitable for a high-cutting shallow-coverage area of the south Qinling mountain, which can rapidly determine the position of a gold mine and improve the gold mine prospecting efficiency.
In order to achieve the purpose, the invention provides the following scheme:
a fast ore finding method for gold ores suitable for a high-cutting shallow coverage area of the south Qinling mountain comprises the following steps:
carrying out comprehensive research on the research area, and determining a gold prospecting target area;
carrying out 1:1 ten thousand soil geochemical measurement work in the gold prospecting target area to form a single element abnormal graph; the single element abnormality map comprises an Au abnormality map and an As abnormality map;
classifying the soil high-value points according to the single element abnormal graph, sampling basic analysis samples by using a portable spectrometer according to a classification result, and determining a mineralizer based on the analysis result of the basic analysis samples; the soil high value point is a soil result point of which the gold abnormal value is greater than or equal to a first preset gold abnormal value or the arsenic abnormal value is greater than or equal to a first preset arsenic abnormal value in the soil result points of 1:1 ten thousand soil geochemical measurement work;
arranging an audio magnetotelluric sounding profile perpendicular to the trend of the mineralized body, carrying out measurement along a section line to form an AMT inversion result, and determining the deep extension condition of the mineralized body;
and carrying out deep verification on the mineralized body distribution drill holes to finish the gold ore searching process.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention provides a rapid gold prospecting method suitable for a high-cutting shallow coverage area of the south Qinling mountain, which is characterized by firstly determining a gold prospecting target area, carrying out 1:1 ten thousand soil geochemical measurement work in the gold prospecting target area and forming a single element abnormal graph, wherein the single element abnormal graph comprises an Au abnormal graph and an As abnormal graph. Then classifying the high-value points of the soil according to the single element abnormal graph, sampling basic analysis samples by using a portable spectrometer according to classification results, delineating a mineralized body based on the analysis results of the basic analysis samples, laying an audio magnetotelluric depth measuring profile in the direction perpendicular to the mineralized body, carrying out measurement along a section line, forming an AMT inversion result, determining the deep extension condition of the mineralized body, finally carrying out deep verification on the mineralized body laying drill holes, combining the drill hole sample laying work with the portable spectrometer, and finally completing the mineral exploration process of gold mines. The invention introduces the soil high-value points to remove the soil result points with smaller gold and arsenic abnormal values, can reduce the number of basic analysis samples and obviously improve the sampling efficiency of the basic analysis samples, and also utilizes the portable spectrometer to sample the basic analysis samples, so that the sampling process is more targeted and more accurate, the sampling efficiency is improved, and the rapid prospecting of gold ores can be realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a flow chart of a method of a rapid prospecting method provided in embodiment 1 of the invention;
fig. 2 is a specific flowchart of a rapid prospecting method provided in embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of an anomaly of a water system deposit provided in example 1 of the present invention;
fig. 4 is a schematic diagram of arrangement of 1:1 ten thousand soil point locations in the wangzhuangjin prospecting target area provided in embodiment 1 of the present invention;
FIG. 5 is a geochemistry chart of Wangzhuang soil survey gold provided in example 1 of the present invention;
fig. 6 is a binary function graph of soil measurement results of the Wangzhuangjin prospecting target area provided in embodiment 1 of the present invention;
FIG. 7 is a planar contour map of the apparent polarizability of the target region in the Wangzhuangjin prospecting provided in example 1 of the present invention;
FIG. 8 is a plan contour plot of apparent resistivity of the Wangzhuang prospecting target area provided in example 1 of the present invention;
fig. 9 is an AMT inversion result of a wangzhuangjin prospecting target area provided in embodiment 1 of the present invention;
fig. 10 is a plan for verifying the hole drilling of the Wangzhuangjin prospecting target area provided in example 1 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a rapid gold mine prospecting method suitable for a high-cutting shallow-coverage area of the south Qinling mountain, which can rapidly determine the position of a gold mine and improve the gold mine prospecting efficiency.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example 1:
the embodiment is used for providing a fast gold mine prospecting method suitable for a high-cutting shallow coverage area of the south qinling ridge, as shown in fig. 1 and 2, the fast gold mine prospecting method comprises the following steps:
s1: carrying out comprehensive research on the research area, and determining a gold prospecting target area;
specifically, S1 may include:
1) determining the beneficial mineralization area through the area remote sensing data, the geophysical prospecting data and the chemical prospecting data of the research area;
the regional remote sensing data comprise surface structure information, the geophysical prospecting data comprise alteration information and deep geological structure information, and the chemical prospecting data comprise gold anomaly information and arsenic anomaly information.
2) Carrying out 1:5 ten thousand water system sediment measurement work in the beneficial mining area of gold, and determining a key working area;
and obtaining gold and arsenic abnormity after carrying out 1:5 water system sediment measurement work, and carrying out screening and checking work according to gold and arsenic abnormity sequencing to select a key working area.
3) 1:1 ten thousand special geological surveys are carried out in the key working area to determine the target area of the gold prospecting.
Specifically, 1:1 ten thousand special geological surveys, namely field actual surveys, are developed in the key working area, a structural lithology graph is drawn in a filling mode, the structural lithology graph is used for representing the space-time distribution and the internal structural element characteristics of different structural units and different lithologies or lithology combinations related to the different structural units, and the structural information and the lithology information of the key working area can be displayed. And then determining the section with the intense alteration according to the structural lithology diagram, specifically determining an ore control structure and an ore-containing construction according to the structural lithology diagram, and then determining the section with the intense alteration according to the ore control structure and the ore-containing construction. Collecting basic chemical samples in the section with strong alteration, preliminarily finding out mineralization clues and alteration zone trends according to the analysis results of the basic chemical samples, determining the trends of the mineralization alteration zones and the fragmentation alteration zones, and determining the gold prospecting target area.
On the basis of the work of the earlier-stage area, the method develops the abnormal investigation of the key area, and can gradually reduce the area where the gold is mineralized, thereby determining the target area of the gold prospecting, reducing the prospecting time and improving the prospecting speed.
As an optional implementation manner, before determining that the gold is favorable to the mining area, the rapid prospecting method of this embodiment further includes: carrying out comprehensive research on a research area, carding typical gold deposits in the research area, summarizing ore deposit formation elements, and obtaining intra-area gold mineralization and alteration characteristics, wherein the intra-area gold mineralization and alteration characteristics are used for assisting the gold deposit exploration process.
S2: carrying out 1:1 ten thousand soil geochemical measurement work in the gold prospecting target area to form a single element abnormal graph; the single element abnormality map comprises an Au abnormality map and an As abnormality map;
when 1:1 ten thousand soil geochemical survey work is carried out in the target area for finding the ore, the mesh degree is 100m multiplied by 40m or 100m multiplied by 20m, the arrangement of the soil result points is carried out according to the trend of the mineralization alteration zone, finally, single element abnormal graphs such As Au, As and the like are formed, meanwhile, a comprehensive abnormal graph can be generated, and the comprehensive abnormal graph can be used for assisting the classification process of the soil high value points.
S3: classifying the soil high-value points according to the single element abnormal graph, sampling basic analysis samples by using a portable spectrometer according to a classification result, and determining a mineralizer based on the analysis result of the basic analysis samples; the soil high value point is a soil result point of which the gold abnormal value is greater than or equal to a first preset gold abnormal value or the arsenic abnormal value is greater than or equal to a first preset arsenic abnormal value in the soil result points of 1:1 ten thousand soil geochemical measurement work;
in S3, classifying the soil high value points according to the single element abnormality map (i.e. the results of Au and As in soil) may include:
1) for each soil high value point, judging whether the gold abnormal value of the soil high value point is greater than or equal to a second preset gold abnormal value or whether the arsenic abnormal value is greater than or equal to a second abnormal arsenic abnormal value, and obtaining a first judgment result;
2) if the first judgment result is yes, namely the gold abnormal value is greater than or equal to a second preset gold abnormal value, or the arsenic abnormal value is greater than or equal to a second abnormal arsenic abnormal value, the soil high value point is a grade 1 check point; if the first judgment result is negative, judging whether the gold abnormal value of the soil high-value point is greater than or equal to a third preset gold abnormal value or whether the arsenic abnormal value is greater than or equal to a third preset arsenic abnormal value, and obtaining a second judgment result; the third preset gold abnormal value is smaller than the second preset gold abnormal value, and the third preset arsenic abnormal value is smaller than the second preset arsenic abnormal value;
3) if the second judgment result is yes, the soil high value point is a level 2 check point; if the second judgment result is negative, judging whether the gold abnormal value of the soil high-value point is greater than or equal to a fourth preset gold abnormal value or whether the arsenic abnormal value is greater than or equal to a fourth abnormal arsenic abnormal value, and obtaining a third judgment result; the fourth preset gold abnormal value is smaller than the third preset gold abnormal value, and the fourth preset arsenic abnormal value is smaller than the third preset arsenic abnormal value;
4) if the third judgment result is yes, the soil high value point is a 3-level check point; if the third judgment result is negative, judging whether the gold abnormal value of the soil high-value point is greater than or equal to a fifth preset gold abnormal value or whether the arsenic abnormal value is greater than or equal to a fifth abnormal arsenic abnormal value, and obtaining a fourth judgment result; the fifth preset gold abnormal value is smaller than the fourth preset gold abnormal value, and the fifth preset arsenic abnormal value is smaller than the fourth preset arsenic abnormal value; the fifth preset gold abnormal value is greater than the first preset gold abnormal value, and the fifth preset arsenic abnormal value is greater than the first preset arsenic abnormal value;
5) if the fourth judgment result is yes, the soil high value point is a 4-level check point; if the fourth judgment result is negative, the soil high value point is a grade 5 check point.
More specifically, the first predetermined gold outlier is 20, and the first predetermined arsenic outlier is 40; a second predetermined arsenic outlier of 300 and a second predetermined arsenic outlier of 600; a third predetermined gold outlier is 200 and a third predetermined arsenic outlier is 400; a fourth predetermined gold outlier is 100 and a fourth predetermined arsenic outlier is 200; the fifth predetermined golden outlier is 50 and the fifth predetermined arsenic outlier is 100. Classifying the soil high value points according to the abnormal values of Au (gold) and As (arsenic) (unit: ppb) can comprise: let a be Au-As-abnormal, when there is a binary function y be f (a; b). Then the grade 1 check point is defined as y1 ═ f (a ≧ 300; b ≧ 600); y2 ═ f (300 > a ≥ 200; 600 > b ≥ 400) is a level 2 checkpoint; y3 ═ f (200 > a ≥ 100; 400 > b ≥ 200) is a grade 3 checkpoint; y4 ═ f (100 > a ≥ 50; 200 > b ≥ 100) is a 4-grade checkpoint; and y5 is a grade 5 check point, f (50 & gta & gt20; 100 & gtb & gt40).
In S3, according to the classification result, the sampling of the basic analysis sample by the portable spectrometer may include, for different levels of the inspection points, adopting different sampling methods, specifically including:
1) for level 1 checkpoints, level 1 checkpoints need to find the source of the exception, and the sampling method used is: the method comprises the steps of utilizing a backpack to drill a basement rock to expose a basement rock abnormal source, specifically utilizing a backpack drill to drill a basement rock, determining a plurality of measurement points on a drilled rock core along the depth direction of a drill hole based on a preset length, wherein the preset length can be 5cm, and then utilizing a portable spectrometer to determine the arsenic abnormal change value of each measurement point on the drilled rock core. And carrying out sectional sampling according to the arsenic abnormal change value to obtain a plurality of basic analysis samples corresponding to the grade 1 inspection point. Specifically, after determining the As abnormal change value in the columnar drilling core, registering the position with the analysis result of more than or equal to 0.02 percent of the As abnormal change value, simultaneously carrying out subsection sampling to obtain a basic analysis sample, and carrying out subsection sampling according to the subsection range of the As abnormal change value of more than or equal to 0.02 percent and less than 0.1 percent, the As abnormal change value of more than or equal to 0.1 percent and less than 0.5 percent and the As abnormal change value of more than or equal to 0.5 percent, and simultaneously ensuring that the length meets the test quality requirement of the sample. It should be noted that, during sampling, a split core sampling mode is adopted, that is, a columnar drill core is split into two halves, and one half is taken as a basic analysis sample.
2) For level 2 checkpoints and level 3 checkpoints, level 2 checkpoints and level 3 checkpoints need to approximately pinpoint the source of the anomaly in a sampling manner: judging whether the class 2 check point or the class 3 check point is in the extending direction of the mineralization alteration zone in which the class 1 check point is positioned; if so, sampling the 2-level check point or the 3-level check point in a sampling mode of the 1-level check point to obtain a plurality of basic analysis samples corresponding to the 2-level check point or the 3-level check point; if not, sampling is carried out on the mineralization alteration zone around the 2-level check point or the 3-level check point, and a plurality of basic analysis samples or spectrum samples corresponding to the 2-level check point or the 3-level check point are obtained; specifically, the sampling mode of the level 2 checkpoint or the level 3 checkpoint is as follows: for the section with better bedrock exposure, the notch sample is mainly used, and the other sections are mainly used for picking up the block sample. It should be noted that the spectrum sample and the basic analysis sample do not belong to one type, the basic analysis sample is quantitative, and the spectrum sample belongs to semi-quantitative, for example, the abnormal source in some area cannot be determined, the spectrum sample can be collected to judge whether the abnormal source exists, and the spectrum analysis cost is low and fast.
3) For the 4-level check point and the 5-level check point, a route investigation mode is adopted, and the specific sampling mode is as follows: sampling is carried out on the mineralization alteration zone around the 4-grade check point or the 5-grade check point, and a plurality of basic analysis samples or spectrum samples of the bedrock corresponding to the 4-grade check point or the 5-grade check point are obtained. The sampling mode of the level 4 check point or the level 5 check point is as follows: mainly adopts the sample picking and checking.
The portable spectrometer is an auxiliary means for sampling a notch sample and a core sample, and if the sample is sampled in a block sample picking mode, the portable spectrometer cannot be used. In sampling, sampling of basic analysis samples is performed in order from the level 1 checkpoint to the level 5 checkpoint.
As an alternative embodiment, if the analysis results of the basic analysis sample and the spectrum sample in the steps 2) and 3) show that the position of the check point is in a region where the Au is abnormally obvious, that is, the basic analysis sample result is greater than 0.1g/t, and the spectrum sample result is greater than 20ppb, then the sampling method in the step 1) needs to be performed.
Gold ore is different from non-ferrous metal mineral products, the gold ore is completely based on sampling and testing results, the selection of sampling positions is important for accurately delineating a gold ore mineralizer, continuous sampling is often adopted in the conventional means in the past, the accurate boundary of the ore body and surrounding rocks is difficult to identify by the method, and the phenomena of reducing grade and even leaking ore exist. In the embodiment, the position of the gold mineralized body is accurately determined by analyzing the arsenic concentration of the rock core through the portable spectrometer by utilizing the gold arsenic correlation, and the ore is not easy to leak
In addition, in the embodiment, a soil high-value point (also referred to as a soil abnormal point) is introduced first, a soil abnormal region is defined by using the gold-arsenic correlation, and soil abnormal inspection is performed in different regions, so that the abnormal inspection efficiency can be improved. And secondly, the abnormal values of the gold and arsenic soil are classified, and the inspection is sequentially carried out according to the sequence from the level 1 inspection point to the level 5 inspection point, so that the key inspection area can be accurately identified. For the grade 1 check point and other check points in the extension direction of the grade 1 check point, the backpack drill is adopted to obtain the core, and in sampling, the portable spectrometer is utilized to rapidly analyze the core obtained by the backpack drill, so that the arsenic abnormal areas are effectively distinguished, samples in different arsenic abnormal areas are taken in a segmented manner, the samples are taken in a targeted manner, the sampling efficiency and the sampling accuracy are improved, and more favorable evidence is provided for the subsequent ore body demarcation. Because the topography in the south Qinling mountain area is steep, the covering layer is thick, the disclosure and identification of the primary abnormal source by the channel exploration work are difficult, and the local environmental protection policy is strict, according to the conventional method, the channel exploration project can not disclose the bedrock, and meanwhile, the risk problems of environment damage and the like are caused by surface excavation. This embodiment utilizes the knapsack to bore and replaces the groove to visit and construct, can guarantee engineering progress and quality.
After the mineralized body is defined based on the analysis result of the basic analysis sample, the rapid prospecting method of the embodiment can further comprise the step of drawing a planar geological map of the mineralized body according to the position range of the defined mineralized body.
S4: arranging an audio magnetotelluric sounding profile perpendicular to the trend of the mineralized body, carrying out measurement along a section line to form an AMT inversion result, and determining the deep extension condition of the mineralized body;
an audio frequency earth electromagnetic sounding (AMT) section is arranged perpendicular to the trend of the mineralizer, the distance between the sections is 200 meters, the point distance is 20-40 meters, and the point distance between the two sides of the mineralizer within the range of 40 meters is 20 meters. And carrying out route navigation through a GPS handset or a Beidou handheld terminal, carrying out measurement along a section line, carrying out computer data processing on data acquired in the measurement process to form an AMT inversion result, and determining the extension condition of the deep part of the mineralized body by combining geological knowledge. The audio magnetotelluric sounding method is selected, the problem of poor gradient effect in induced polarization of a high cutting area is solved, the deep extension condition of the mineralized body is effectively controlled, and a basis is provided for resource potential evaluation.
After determining the deep extension of the mineralized body, the rapid prospecting method of the embodiment further comprises the following steps: and (3) comprehensively mapping geophysical prospecting data, chemical prospecting data, the position and deep extension condition (namely mineralization information) of the mineralized body and a structural lithology map (namely geological information) to obtain a synthetic map of the mineralization information, wherein the synthetic map of the mineralization information is used for showing the plane and space distribution characteristics of the mineralized body so as to basically determine the plane and space distribution characteristics of the mineralized body.
S5: and carrying out deep verification on the mineralized body distribution drill holes to finish the gold ore searching process.
S5 may include:
1) perpendicular to the mineralized body, arranging a measurer to determine the position of the mineralized body, the surface mineral engineering position and the topographic line by using RTK (real-time kinematic), determining the attitude of the mineralized body, and determining the optimal drilling position according to the attitude of the mineralized body; the ore body occurrence is an important factor of spatial distribution of the ore body, and comprises the ore body trend, inclination, dip angle, lateral camber, dip angle and the like.
2) After the measuring personnel retest the drilling position, drilling at the optimal drilling position by using a modular portable drilling machine to obtain a bedrock core; the modularized portable drilling machine is convenient to move and install, small in occupied area and capable of meeting the requirement of green reconnaissance.
3) And (4) splitting and sampling the rock core of the bedrock, combining the position of the split sample with a portable spectrometer, numbering according to arsenic element abnormality, and performing sectional sampling. Finally, determining the real deep extension condition and grade change of the mineralized body according to surface engineering;
4) and carrying out geophysical prospecting well logging at the construction drill hole of the modular portable drilling machine, detecting abnormal information and continuity of the mineralized body at a short distance, evaluating the stability and continuity of the mineralized body, evaluating the potential of mineral resources, and simultaneously guiding the next engineering construction.
5) And after the well logging is finished, carrying out full-hole cement hole sealing on the drilled hole to finish the ore searching process of the gold ore.
The later stage of this embodiment is verified and is adopted portable rig of modularization, accords with green investigation technical requirement. Because the vegetation is luxuriant in the areas of the mountains of south and Qin mountains, the terrain is steep, the vegetation is damaged by conventional groove exploration and drilling construction, water and soil loss is caused, and the environmental influence is severe, equipment such as a backpack drill, a modularized portable drilling machine and the like is utilized, and new technologies and new processes such as 'replacing grooves with drills' and 'one-base porous' are adopted, so that the damage to the surface vegetation and the environmental pollution are reduced as much as possible, and meanwhile, the problems of exploration work and environmental protection of areas difficult to enter can be effectively considered, and the requirements of green exploration and sustainable development are met.
The embodiment provides a method for quickly finding gold ores in a high-cutting shallow-coverage area of the south Qinling mountain, which is characterized in that through refining inspection work in different stages, a portable equipment backpack drill and a portable spectrometer are used for quickly controlling a corrosion change zone, basic analysis samples are accurately adopted, the operation quality and efficiency are greatly improved, meanwhile, a modularized portable drilling machine is used for meeting the requirements of green exploration and sustainable development, and the conventional ore finding idea is optimized.
The rapid prospecting method used in this embodiment is further described below by way of an embodiment:
a: determining a gold favorable mineralization area through area remote sensing, geophysical prospecting and chemical prospecting data, carrying out comprehensive research on a selected area, carding typical gold deposits in the area, and summarizing mineral deposit mineralization elements;
b: b, carrying out 1:5 water system sediment measurement work on the gold selected in the step A in an ore forming area, and meanwhile, carrying out screening and checking work according to abnormal sorting to select a key working area;
c: and C, aiming at the key working area selected in the step B, carrying out 1:1 ten thousand special geological survey, filling and drawing a structural lithology graph, determining an ore control structure and an ore-containing construction, collecting basic chemical samples in a section with intense alteration, preliminarily checking the trend of mineralization clues and alteration zones in the area, and preferably selecting an ore-finding target area. In the embodiment, the Wangzhuangjin ore-finding target area is preferably selected according to the abnormal data of 1:5 ten thousand water system sediments in the region of Shaanxi ten-day shown in FIG. 3.
D: and C, carrying out 1:1 million soil geochemical measurement work aiming at the gold prospecting target area selected in the step C, wherein the mesh degree is 100 meters multiplied by 40 meters or 100 meters multiplied by 20 meters, and the trend of the mineralization alteration zone is arranged mainly according to the step C. The primarily determined abnormal zone of the Wanzhuang jin prospecting target area is characterized in that 1:1 ten thousand soil geochemical measurements are laid, the mesh degree is 100m multiplied by 40m in the example, the soil point positions are laid as shown in figure 4, a 1:1 ten thousand soil measurement unit element abnormal and comprehensive abnormal graph is finally formed according to the measurement result, and the Wanzhuang jin geochemical graph is shown in figure 5;
e: and D, classifying the soil high value points generated in the step D, As shown in figure 6, mainly according to abnormal values (unit: ppb) of Au and As: if a is Au abnormity, b is As abnormity, a binary function y is f (a; b), and y1 is f (a is more than or equal to 300; b is more than or equal to 600) is used As a grade 1 check point; y2 ═ f (300 > a ≧ 200; 600 > b ≧ 400) is the level 2 checkpoint, corresponding to the level 1 checkpoint shown in FIG. 6; y3 ═ f (200 > a ≧ 100; 400 > b ≧ 200) is the level 3 checkpoint, corresponding to the level 2 checkpoint shown in FIG. 6; y4 is a level 4 checkpoint (100 > a ≧ 50; 200 > b ≧ 100), corresponding to the level 3 checkpoint shown in FIG. 6; y5 is the level 5 checkpoint (50 > a ≧ 20; 100 > b ≧ 40), corresponding to the level 4 checkpoint shown in FIG. 6. A grade 1 check point needs to find out an abnormal source, a backpack is used for drilling a roadbed rock abnormal source to be revealed, a portable spectrometer is used for determining a point position on a drilled core every 5 centimeters, determining abnormal change of As in the core column, registering the position with the abnormal change of the analysis result of As more than or equal to 0.02 percent, and simultaneously carrying out sectional sampling on a basic analysis sample (the abnormal change of As more than or equal to 0.02 percent and less than 0.1 percent, the abnormal change of As more than or equal to 0.1 percent and less than 0.5 percent and the abnormal change of As more than or equal to 0.5 percent), and simultaneously ensuring that the length meets the test quality requirement of the sample; 2. a 3-level check point needs to roughly find out an abnormal source, the check point in the extension direction of a 1-level zone needs to be merged into the 1-level check point for inspection, other point positions need to adopt a bedrock basic analysis sample and a spectrum sample respectively in a altered zone near the abnormal source, and further work is adopted according to the result; 4. and a route investigation mode is adopted at the 5-level check point, a basic analysis sample of the matrix alteration zone near the abnormal source is adopted, and further the next step of work is carried out according to the result.
F: e, determining a mineralized body according to the result of the basic analysis sample acquired in the step E, and drawing a planar geological map of the mineralized body;
g: and F, arranging an audio frequency earth electromagnetic sounding (AMT) section perpendicular to the direction of the mineralizer determined in the step F, wherein the distance between the sections is 200 meters, and the point distance is 20-40 meters (the point distance between the two sides of the mineralizer is 20 meters in the range of 40 meters). And performing air route navigation through a GPS handset or a Beidou handheld terminal, and performing measurement along a section line. And acquiring related data, performing computer data processing to form an AMT inversion result, and determining the deep extension condition of the mineralized body by combining geological knowledge. When the power-induced escalator is selected, as can be seen from fig. 7 and 8, the apparent resistivity and the apparent polarization rate are greatly influenced by the valley, and the interpretation effect and the geological information are not accordant. Subsequently, audio magnetotelluric sounding (AMT) is adopted for verification, as shown in FIG. 9, AMT inversion results show that the depth of a mineralized body is extended to a certain extent and is consistent with the geological knowledge of the region, and the effectiveness of the AMT is reflected;
h: and compiling a mineral information comprehensive map, and synthesizing and mapping the physical and chemical exploration data, the mineralization information and the geological information to basically determine the planar and spatial distribution characteristics of the mineralized body.
I: perpendicular to the mineralizer determined in step F, H, the surveyor determines the position of the mineralizer and the topographical lines using RTK, and determines the optimal drilling location from the mineralizer speciation. Through early-stage correlation work, the spreading form of the mineralizer is determined, and as shown in fig. 10, drilling holes are distributed for deep verification;
j: and (4) surveying the drilling position again by the measuring personnel, and subsequently acquiring the bedrock core by utilizing the modularized portable drilling machine.
K: and (4) performing core splitting sampling on the core obtained in the step (I), and determining the deep extension condition of the mineralizer and the grade change of the mineralizer according to surface engineering.
L: and D, performing geophysical prospecting well logging aiming at the construction drill hole in the step J, detecting abnormal information and continuity of the mineralizer in a short distance, evaluating the stability and continuity of the mineralizer, evaluating the potential of mineral resources, and guiding the next engineering construction.
M: and D, after the well logging is finished, carrying out full-hole cement hole sealing on the construction drill holes in the step J.
Through the steps, the determination and the verification of the ore-finding target area can be completed conveniently and efficiently. The rapid prospecting method of the embodiment improves the prospecting efficiency and quality and solves the resource environment problem on the premise of effectively reducing the environmental damage.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, the specific embodiments and the application range may be changed according to the idea of the present invention.
Claims (10)
1. A fast ore finding method for gold mine in a high-cutting shallow coverage area of the south Qinling mountain is characterized by comprising the following steps:
carrying out comprehensive research on the research area, and determining a gold prospecting target area;
carrying out 1:1 ten thousand soil geochemical measurement work in the gold prospecting target area to form a single element abnormal graph; the single element abnormality map comprises an Au abnormality map and an As abnormality map;
classifying the soil high-value points according to the single element abnormal graph, sampling basic analysis samples by using a portable spectrometer according to a classification result, and determining a mineralizer based on the analysis result of the basic analysis samples; the soil high value point is a soil result point of which the gold abnormal value is greater than or equal to a first preset gold abnormal value or the arsenic abnormal value is greater than or equal to a first preset arsenic abnormal value in the soil result points of 1:1 ten thousand soil geochemical measurement work;
arranging an audio magnetotelluric sounding profile perpendicular to the trend of the mineralized body, carrying out measurement along a section line to form an AMT inversion result, and determining the deep extension condition of the mineralized body;
and carrying out deep verification on the mineralized body distribution drill holes to finish the gold ore searching process.
2. The rapid prospecting method according to claim 1, wherein the step of carrying out comprehensive research on the research area and determining the gold prospecting target area specifically comprises:
determining the beneficial mineralization area through the area remote sensing data, the geophysical prospecting data and the chemical prospecting data of the research area;
carrying out 1:5 ten thousand water system sediment measurement work in the beneficial gold mining area, and determining a key working area;
and carrying out 1:1 ten thousand special geological surveys in the key working area to determine a gold prospecting target area.
3. The rapid prospecting method according to claim 2, characterized in that before determining a gold favorable mineralization area, the rapid prospecting method further comprises: carrying out comprehensive research on the research area, carding typical gold deposits in the research area, summarizing mineral deposit forming elements, and obtaining intra-area gold mineralization and alteration characteristics; the intra-gold mineralization alteration characteristic in the area is used for assisting the gold mine prospecting process.
4. The rapid prospecting method according to claim 2, wherein the step of carrying out 1:1 ten thousand special geological surveys in the key working area and the step of determining the gold prospecting target area specifically comprises the steps of:
1:1 ten thousand special geological surveys are carried out in the key working area, and a structural lithology graph is drawn;
determining a section with intense alteration according to the structural lithology graph;
and collecting basic chemical samples in the section with intense alteration, determining the trend of a mineralization alteration zone according to the analysis result of the basic chemical samples, and determining a gold prospecting target area.
5. The rapid prospecting method according to claim 4, characterized in that when 1:1 ten thousand soil geochemical survey works are carried out in the gold prospecting target area, the mesh size is 100m x 40m or 100m x 20m, and the arrangement of the soil result points is carried out according to the trend of the mineralization alteration zone.
6. The rapid prospecting method according to claim 1, wherein the classifying the soil high-value points according to the single element anomaly map specifically comprises:
judging whether the gold abnormal value of the soil high-value point is greater than or equal to a second preset gold abnormal value or whether the arsenic abnormal value is greater than or equal to a second abnormal arsenic abnormal value to obtain a first judgment result;
if the first judgment result is yes, the soil high value point is a level 1 check point;
if the first judgment result is negative, judging whether the gold abnormal value of the soil high-value point is greater than or equal to a third preset gold abnormal value or whether the arsenic abnormal value is greater than or equal to a third preset arsenic abnormal value, and obtaining a second judgment result; the third predetermined golden outlier is less than the second predetermined golden outlier; the third predetermined arsenic outlier is less than the second predetermined arsenic outlier;
if the second judgment result is yes, the soil high value point is a level 2 check point;
if the second judgment result is negative, judging whether the gold abnormal value of the soil high-value point is greater than or equal to a fourth preset gold abnormal value or whether the arsenic abnormal value is greater than or equal to a fourth abnormal arsenic abnormal value, and obtaining a third judgment result; the fourth predetermined golden outlier is less than the third predetermined golden outlier; the fourth predetermined arsenic outlier is less than the third predetermined arsenic outlier;
if the third judgment result is yes, the soil high value point is a 3-level check point;
if the third judgment result is negative, judging whether the gold abnormal value of the soil high-value point is greater than or equal to a fifth preset gold abnormal value or whether the arsenic abnormal value is greater than or equal to a fifth abnormal arsenic abnormal value, and obtaining a fourth judgment result; the fifth preset golden outlier is less than the fourth preset golden outlier; the fifth predetermined arsenic anomaly value is less than the fourth predetermined arsenic anomaly value;
if the fourth judgment result is yes, the soil high value point is a 4-level check point;
and if the fourth judgment result is negative, the soil high value point is a 5-level check point.
7. The rapid prospecting method according to claim 6, wherein the sampling of the basic analysis sample by the portable spectrometer according to the classification result specifically comprises:
for the grade-1 check point, performing bedrock drilling by using a backpack drill, determining a plurality of measurement point positions on a drilling core along the drilling depth direction based on a preset length, and determining an arsenic abnormal change value of each measurement point position by using the portable spectrometer; performing segmented sampling according to the arsenic abnormal change value to obtain a plurality of basic analysis samples corresponding to the grade 1 inspection point;
for the class 2 checkpoint and the class 3 checkpoint, determining whether the class 2 checkpoint or the class 3 checkpoint is in a direction of extension of a mineralization alteration zone in which the class 1 checkpoint is located; if so, sampling the level 2 check point or the level 3 check point in a sampling mode of the level 1 check point to obtain a plurality of basic analysis samples corresponding to the level 2 check point or the level 3 check point; if not, sampling is carried out on the mineralization alteration zone around the 2-level check point or the 3-level check point, and a plurality of basic analysis samples or spectrum samples corresponding to the 2-level check point or the 3-level check point are obtained;
for the class 4 checkpoint and the class 5 checkpoint, sampling is performed on the mineralized altered zone around the class 4 checkpoint or the class 5 checkpoint resulting in several elementary analytical or spectral samples corresponding to the class 4 checkpoint or the class 5 checkpoint.
8. The rapid prospecting method according to claim 6, characterized in that the sampling of the basic analysis samples is carried out sequentially in the order from the level 1 checkpoint to the level 5 checkpoint.
9. The rapid prospecting method according to claim 4, wherein after determining the deep extension of the mineralized body, the rapid prospecting method further comprises:
comprehensively mapping the geophysical prospecting data, the chemical prospecting data, the position and deep extension condition of the mineralized body and the structural lithology map to obtain a synthetic mine information map; the synthetic mine information map is used for showing the plane and space distribution characteristics of the mineralized body.
10. The rapid prospecting method according to claim 1, wherein the deep verification of the mineralized body arrangement drill hole specifically comprises:
determining the position of an ore body, the position of an earth surface mineral engineering and a terrain line by utilizing RTK (real time kinematic) perpendicular to the ore body, determining the attitude of the ore body, and determining the optimal drilling position according to the attitude of the ore body;
drilling at the optimal drilling position by using a modular portable drilling machine to obtain a bedrock core;
splitting and sampling the bedrock core, and determining the real deep extension condition and grade change of the mineralized body according to surface engineering;
performing geophysical prospecting well logging at the drill hole, detecting abnormal information and continuity of the mineralized body, evaluating the stability and continuity of the mineralized body, and evaluating the potential of mineral resources;
and carrying out full-hole cement hole sealing on the drilled hole to finish the gold ore finding process.
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