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Xinjiang Copper-Gold Mine Underground Pre-Support
The project is in Ili Prefecture, Xinjiang Uygur Autonomous Region, at an elevation of 2,500–2,600 meters, representing a typical high-altitude mining environment. The underground workings contain abundant groundwater, and up to 40% of the rock formations are prone to collapse, resulting in highly complex geological conditions.
The project plans four mine tunnels, with a total planned excavation length of approximately 17 km, of which the fractured zone accounts for about 6.8 km. Tunnel face dimensions are 4.2 m × 3.7 m, reduced to 4.0 m × 3.6 m after shotcreting. The original construction method used drill rods to insert φ40 small advance pipes, supported by high-density steel arches. This method resulted in frequent supports, slow advance, high costs, and significant safety risks.
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The Sinorock team completed four cycles of on-site anchor drilling tests, achieving a total drilling length of 448 m. The advance support depth increased from 4 m to 8 m, blasting depth improved to 1.5–2.5 m, and steel arch spacing increased to 1.5–2.5 m. Calculations show a 30–40% reduction in construction costs and over 40% increase in construction efficiency. The method has now been widely applied to fractured zones in this mine.
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Sinorock provided on-site support, collaborating with local technicians to conduct experiments and analyses. The self-drilling canopy support proved effective, further improving construction efficiency.
