在湖南省沅水流域黔陽、沅陵等地進行地質普查的地質勘探队,在河谷中發现了与砂金共生的金剛石矿。现在这个勘探隊已根据普查資料作出勘探設計,有两个地區已開始勘探。金剛石主要用來製造切削,抽絲和鑽眼的工具,切削特硬的金屬和抽裂电灯泡的钨丝。鑽探机的有些鑽头也镶有金剛石。金剛粉、金剛石石砂輪可用來磨製精密儀器上的軸和玻璃零件。 Geological exploration teams carrying out geological surveys in the Lishui River Basin in Hunan Province and Fuling County have found diamond deposits that are symbiotic with sand gold in river valleys. The exploration team has now made exploration designs based on the census data and two areas have begun to explore. Diamond is mainly used to make tools for cutting, spinning and drilling, cutting extremely hard metals, and cutting tungsten filaments. Some of the drilling machines drill bits are also inlaid with diamonds. Diamond powder and diamond stone wheels can be used to grind axes and glass parts on precision instruments.