3-D electroexcited exploration of a gold mine in a certain area of Xinjiang

2025/06/20

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Objective and task: Based on the previous geological exploration and production prospecting, the three-dimensional electroexcitation sounding method will be adopted to further clarify the spatial distribution characteristics of the ore bodies in the area.

Instruments :
The acquisition instruments used were 14 V-FULLWAVER and 1 I-FULLWAVER from IRIS Instruments. The processing software includes ERTlab64, ProsysII and Full wave viewer.

Work Deployment:
The three-dimensional excited current detection area is 0.08 square kilometers, with 84 physical points. Data collection was carried out in this work through a combination of four-pole and three-pole sounding. The receiver point distance is 40 meters and the pole distance is 20 meters. The four-pole AB/2 distances are 300, 600, 900 and 1200 meters respectively. The three-pole measurement depth is infinite. The B pole is 2,600 meters away from the center point of the work area.

It is known that gold ore bodies mainly occur in the gold-bearing erosion variants between the F3 and F4 faults. The contour plane of the charging rate at an elevation of 2,030 meters shows that the high charging rate mainly corresponds to the gold ore body. The mining and excavation plan at an elevation of 2,030 meters shows that the mined shafts, mining areas and main roadways all have low charging rates, while the unmined and under-mining gold ore bodies exhibit high charging rates.

The ERTlab64 software was used to further correct the imported data (data screening, rejection, and filtering), so that the apparent resistivity and apparent polarizing rate (charging rate) of the data were as normally distributed as possible. An appropriate number of iterations and residual calculations were selected (5 iterations and 15 residual calculations were chosen for this parameter, with an inversion depth of 600 meters), and the data was inverted. The obtained results are shown in the figure. Finally, the deep extension direction of the ore body was inferred based on the electrical characteristics of the specimen: high polarization rate and high resistance, and the excitation anomaly of the enclosure.

From left to right and top to bottom, the floor plans are 2030m, 2000m, 1965m and 1850m respectively. The anomaly range of D1 gradually decreases with the increase of depth. The anomaly ranges of D2 and D3 first increase and then decrease with the increase of depth, which is consistent with the change trend of ore body No. 2. The anomaly range of D4 gradually increases with the increase of depth and the anomaly gradually lies laterally in the northeast direction.

Based on a thorough study of the existing geological, drilling, hydrological and geophysical and geochemical exploration data of the mining area, combined with the physical property results of this time, the enrichment part of the deposit ore body in the circle was finally inferred according to the charging rate range of 140-160mV/V (the determination of physical property specimens shows that the polarization rate of high-grade gold ore is 15.33%), and the three-dimensional model of gold (chemical) erosion variant was obtained.
It can be inferred from this that the gold mineralization body still extends outward in the southwest direction of the mining area, with an elevation approximately ranging from 2100 to 1850 meters. The deep part towards the northeast of the mining area may be the source of the gold-bearing hydrothermal fluid of the Solbas ceramic gold deposit. The gold ore body still extends to the deep part towards the northeast, with an elevation approximately ranging from 1900 to 1750 meters. The middle part of the mining area is the main area for mining and excavation, with a high degree of ore body enrichment. Through analysis, it is inferred that the ore body in the middle of the mining area gradually pointed out at an elevation of about 1700 meters. Therefore, further work in the southwest and northeast directions of the mining area is not only conducive to expanding the gold reserves, but also has practical significance for the continuation and sustainable development of the mine.