Underground drilling | Epiroc
Ruby, Sapphire, and Spinel. Corundum and spinel are mingled in alluvial placers. Mining is conducted on a small scale, from Bai Lai in the northeast of Luc Yen to the Na Ha area in the south, near the banks of Thac Ba Lake. The most active sites are along the streams of Cong Troi, in Nuoc Ngap (An Phu area).
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