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首先,世界范围内至少发现了六个世界级(100吨以上)的金矿床。它们是加拿大安大略省产在太古代绿岩带中的赫姆洛矿床(储量590吨,品位4—16克/吨),美国加利福尼亚州产在火山一沉积岩区的麦克劳克林矿床(储量100吨,品位4.98克/短吨);美国内华达州卡林型的金坑矿床(储量127吨,品位4.35克/吨);日本九州产在火山岩中的菱刈矿床(储量120吨,品位4.35克/吨);巴布亚新几内亚产在火山岩中的波格拉金矿(储量287吨,品位3.5克/短吨)和利海尔
First of all, at least six world-class (over 100 tons) gold deposits have been discovered worldwide. They are the Hemlo deposits (590 tonnes, grade 4-16 g / t) in the Archean Green Belt, Ontario, Canada, the McCrackin deposit in the California volcanic-sedimentary area (stock 100 Ton, grade 4.98 g / short ton); Carlin-type gold deposit in Nevada, USA (127 tonnes, grade 4.35 g / t); Ling Kari mined in volcanic rocks, Kyushu, Japan Ton); Pogora gold mines (287 tonnes, 3.5 g / short ton) produced in volcanic rocks in Papua New Guinea; and Li Haier