Drilling methods for ultra-hard stratum for the curtain groutingproject of No. Ⅰ ore body of Great Wall Gold Mine, Qian’an

Abstract:

The curtain grouting project of No. I ore body of Great Wall Gold Mine in Qian’an is of a large-scale, and the geological structure of this mine area is complex. When curtain drilling entered the ultra-hard “slippery” dolomite stratum, the penetration rate became low, which greatly affected the construction schedule. Therefore, various construction technologies have been tested for this stratum in the drilling process, and with the analysis based on the data collected about drill bit types, drilling technologies and drilling parameters in the real drilling process, the most effective drilling methods have been established, which can provide good reference for future prospecting and the second stage curtain drilling project in this area.