placer gold deposit 砂金矿床
placer-gold 砂金
placer gold mine 砂金矿山
placer gold sample 砂金样品
placer gold mining 砂金矿开采
placer gold mineral 砂金成矿
placer gold samples 砂金样品
The coefficient of dissolution can indicate the source of placer gold.
溶蚀系数可指示砂金是近或远原生源金矿。
A placer gold area is usually distributed in the flowing regions of plain terrain, belt-like rivers.
砂金地区一般分布在地形平坦、呈带状的江河流域。
The source materials of the placer gold deposit in the area are from skarn — typed Au — Ag — Cu — Fe polymetallic ore.
矽卡岩型金银铜铁多金属矿床等是本区砂金矿的物质来源。
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