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Chuquicamata Mine, CODELCO, Chile

I visited this mine in 2016.  Chuqui is the largest Open Pit Copper Mine (by excavated volume) in the world. It is located in the north of Chile, just outside Calama at 2,850 m (9,350 ft) above sea level, 215 km (134 mi) and 1,240 km (770 mi) north of the capital, Santiago

Holes drilled for resin bolts should be ¼ inch larger in diameter than the bolt. If it is increased to 3/8 inch, the pull out load is not affected but the stiffness of the bolt/resin assembly is lowered by more than 80%, besides wasting money on unnecessary resin. Source: Dr. Pierre Choquette 

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