A Tunnel Gravity Method for Judging the Deep Extension of Low Density Vertical Orebody

A low-density, ore body technology, applied in the direction of measuring gravitational field, instruments, measuring devices, 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: 2022-05-24
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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  • A Tunnel Gravity Method for Judging the Deep Extension of Low Density Vertical Orebody
  • A Tunnel Gravity Method for Judging the Deep Extension of Low Density Vertical Orebody
  • A Tunnel Gravity Method for Judging the Deep Extension of Low Density Vertical Orebody

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0050] (1) The system collects, measures and counts the average density of rocks and ores in the survey area

[0051] A total of 55 rock and ore samples were collected in the survey area, including 20 rocks (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 specimens are shown in Table 1; the average density of coal ore in the survey area is 1.67g / cm 3 , the average density of rock 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 ore body, which has the premise of density difference for the application of this method;

[0052] Table 1 Rock and ore density measurement results...

Embodiment 2

[0076] Embodiment 2: this method carries out tunnel gravity detection in the deep part of a certain rock salt mining area in central Yunnan, and has achieved good prospecting effect, as follows:

[0077] (1) The system collects, measures and counts the average density of rocks and ores in the survey area

[0078] A total of 55 rock and ore samples were collected in the survey area, including 15 halite ore and 30 rocks (surrounding rocks) (10 mudstone, 10 argillaceous siltstone, and 10 quartz sandstone). The density measurement results of ore specimens are shown in Table 5; the average density of rock salt ore 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 ore body, which has the premise of density difference for the application of this method;

[0079] Table 5 Ore density measuremen...

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Abstract

The invention discloses a tunnel gravity method for judging the deep extension of a low-density upright plate-shaped ore body. Firstly, the Bouguer gravity anomaly is obtained through field tunnel gravity observation and various corrections of observation data. Second, through the field separation of the Bouguer gravity anomaly, the remaining gravity anomaly is obtained. Judging whether the ore body is a vertical ore body according to the symmetry of the residual gravity anomaly of the tunnel, and then judging the deep extension characteristics of the low-density vertical ore body according to the positive or negative of the residual gravity anomaly of the tunnel. This method solves the problem of how to quickly judge the deep extension of low-density ore bodies when single or multiple tunnels see the ore body. It not only provides an important basis for the layout of deep prospecting projects, but also proposes a new method for judging the prospect of deep ore body resources.

Description

technical field [0001] The invention relates to a tunnel gravity method for judging the deep extension of a low-density vertical plate-shaped ore body, and belongs 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 depths. To know the deep extension of the ore body, the most direct method is to control the ore body by constructing tunnels or drilling works to the depths. However, before designing deep prospecting tunnels or drilling holes, it is necessary to predict the deep extension of the ore body. Therefore, geophysical surveys are generally carried out before design. Geophysical methods include gravity exploration, magnetic exploration, electrical exploration, seismic exploration, radioactive exploration, and geothermal exploration. Electric expl...

Claims

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Application Information

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Patent Type & Authority Patents(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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