A Tunnel Gravity Method for Judging the Deep Extension of High Density Vertical Orebody
A high-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
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Embodiment 1
[0049] Embodiment 1: this method carries out gravity detection in the deep tunnel of a certain lead-zinc mining area in Pingbao area, Hunan, and has achieved good prospecting effect, as follows:
[0050] This deposit is a typical representative of magmatic hydrothermal lead-zinc deposits in southern Hunan, and its formation is closely related to the emplacement of early Yanshanian granodiorite porphyry. The deposit is mainly controlled by ore-forming plutons and fault-fold structures. The main ore body is in the shape of a large vein, and mainly occurs in the marbleized limestone of the Shidengzi Formation. Other surrounding rocks include the sand shale of the Qishui Formation and the dolomite of the Zimenqiao Formation. The grade of lead-zinc ore is higher (3.05-3.90g / cm 3 ). The main ore minerals are sphalerite, galena, pyrite, pyrrhotite, and gangue minerals are quartz, calcite, etc. The deposit has experienced decades of development and utilization, and the deep resourc...
Embodiment 2
[0076] Embodiment 2: this method carries out tunnel gravity detection in the deep part of a certain copper deposit 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 35 rock and ore samples were collected in the survey area, including 15 chalcopyrite-bornite ores, 20 rocks (surrounding rocks) (10 massive dolomite, 5 dolomite slate, and volcanic breccia). 5. The density measurement results of ore specimens are shown in Table 5; the average density of chalcopyrite-bornite ore in the survey area is 4.09g / cm 3 , the average density of surrounding rock is 2.59g / cm 3 , the average density of the ore is 1.5g / cm higher than that of the surrounding rock 3 , that is, the copper ore in the survey area is a high-density vein ore body, which has the premise of density difference for the application of this method;
[0079] Table 5 Ore d...
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