Method for judging tunnel gravity of deep extension of low-density upright ore body

A low-density, ore body technology, applied in the direction of measuring gravitational field, measuring devices, instruments, etc., can solve problems such as difficulty in obtaining accurate and high-precision three-way gradient values, inability to judge the deep extension of ore bodies, and small three-way gradient values , to achieve the effect of shortening the prospecting cycle, reducing the cost of prospecting, and having little impact

Active Publication Date: 2021-06-25
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

However, in the patent, four parameters are used for the positioning detection of the ore body. Due to the small space of the tunnel and the small gradient values ​​in the three directions, it is generally difficult to obtain accurate and high-precision gradient values ​​in the three directions, and it is not possible to Judging the deep extension of the ore body; this study invented a method for judging the deep extension of the low-density upright ore body using only a single parameter of tunnel gravity anomaly

Method used

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  • Method for judging tunnel gravity of deep extension of low-density upright ore body
  • Method for judging tunnel gravity of deep extension of low-density upright ore body
  • Method for judging tunnel gravity of deep extension of low-density upright ore body

Examples

Experimental program
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Effect test

Embodiment 1

[0049] Example 1: This method carried out tunnel gravity detection in the deep part of a coal mine in eastern Yunnan, and achieved good prospecting results, as follows:

[0050] (1) Systematic collection, measurement, and statistics of the average density of rocks and ores in the survey area

[0051] A total of 55 pieces of rock and ore samples were collected in the survey area, including 20 pieces of rock (5 pieces of fine sandstone, 5 pieces of siltstone, 5 pieces of shale, and 5 pieces of argillaceous limestone), and 35 pieces of coal mines. The density measurement results of rock and ore samples are shown in Table 1; the average density of coal ore in the survey area is 1.67g / cm 3 , the average rock density is 2.60g / cm 3 , the average density of rock is 0.93g / cm higher than that of ore 3 , that is, the ore in the survey area is a low-density vein-shaped ore body, which has the premise of density difference for the application of this method;

[0052] Table 1 The results...

Embodiment 2

[0076] Embodiment 2: This method carried out tunnel gravity detection in the deep part of a halite mining area in central Yunnan, and achieved good prospecting results, as follows:

[0077] (1) Systematic collection, measurement, and statistics of the average density of rocks and ores in the survey area

[0078] A total of 55 pieces of rock and ore samples were collected in the survey area, including 15 pieces of halite ore and 30 pieces of rock (surrounding rock) (10 pieces of mudstone, 10 pieces of argillaceous siltstone, and 10 pieces of quartz sandstone). The density measurement results of ore samples are shown in Table 5; the average density of halite in the survey area is 2.28g / cm 3 , the average density of surrounding rock is 2.78g / cm 3 , the average density of the ore is 0.5g / cm lower than that of the surrounding rock 3 , that is, the halite ore in the survey area is a low-density vein-shaped ore body, which has the premise of density difference for the application o...

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Abstract

The invention discloses a method for judging tunnel gravity of deep extension of a low-density upright ore body. The method comprises: obtaining Bouguer gravity anomaly through field tunnel gravity observation, various corrections of observation data and the like; obtaining residual gravity anomaly through field separation of Bouguer gravity anomaly; and judging whether an ore body is a vertical ore body or not according to the residual gravity anomaly symmetry of the tunnel, and judging the deep extension characteristics of the low-density vertical ore body according to the positive and negative characteristics of the residual gravity anomaly of the tunnel. According to the method, the problem of how to quickly judge the deep extension of the low-density ore body when the ore body is seen in a single tunnel or multiple tunnels is solved, so that an important basis is provided for deep prospecting engineering arrangement, and a new method is provided for deep ore body resource distant view judgment.

Description

technical field [0001] The invention relates to a tunnel gravity method for judging the deep extension of a low-density upright plate-shaped ore body, belonging to the field of mineral resource exploration. Background technique [0002] In the process of ore deposit exploration, when ore bodies are discovered through pit exploration engineering, people are usually very concerned about how much the discovered ore bodies extend to the deep. To know the deep extension of the ore body, the most direct way is to control the ore body in the deep construction tunnel or drilling engineering. However, before designing deep prospecting tunnels or boreholes, it is necessary to predict the deep extension of the ore body. Therefore, prior to design, geophysical surveys are generally carried out. Geophysical methods include gravity prospecting, magnetic prospecting, electrical prospecting, seismic prospecting, radioactive prospecting, geothermal prospecting, etc. Generally speaking, sei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V7/00
CPCG01V7/00
Inventor 韩润生王季雨李文尧
Owner KUNMING UNIV OF SCI & TECH
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