APPLICATION OF HIGH-DENSITY RESISTIVITY METHOD IN DETECTING WATER-BEARING STRUCTURES AT A SEABED GOLD MINE

Abstract

The water in the overlying rock of seabed gold mine directly threats the exploitation safety. The strike drift at −135 m level of the Xinli mine district of Sanshandao gold mine in Shandong province, was selected to be the applicable site for high-density resistivity method, which was used to detect water-bearing structures in the surrounding rock 200 meters below a measuring line of 635 m long. Three DC devices including Wenner, Dipole-Dipole, and Schlumberger were implemented in the selected drift respectively, authenticated each other and collected good detections. The apparent resistivity inversion results of these devices give the consistent conclusion that three different resistive layers exist under the strike drift. The rock mass of 30 m thick under the level of −135 m is a high resistivity layer, which indicates no or little water in the rock mass between the levels of −135 m and −165 m. The rock mass ranging from 30 m to 60 m in depth under the level −135 m has low resistivity and bears fracture water. And a very high resistivity layer deeper than 60 m under the −135 m indicates that the aquosity of the rock mass under −200 m progressively decreases. These detection results show good agreement with the conclusions of field hydrogeology surveys and hydrological structure analyses and that high-density resistivity method is feasible for uncovering water-bearing structures in drift.