世界黄金总产量的一半到三分之二来自砂金矿床。从某些主要产区采出的黄金多达311吨。所有主要产区和许多产量较少的产区有着类似的特点。研究这些特点,可以了解矿床中黄金的来源。熟悉金矿床的地质历史,就能得出有益的砂矿和原生矿床勘探工作的结论。经调查,在世界17个砂金矿区中只有4个矿区的基岩是石英岩或砂岩,其余矿区都 Half of the world’s gold output to two-thirds comes from placer gold deposits. As much as 311 tons of gold are produced from some of the major producing areas. All major producing areas and many less producing areas have similar characteristics. Study these characteristics, you can understand the source of the gold in the deposit. Familiar with the geological history of the gold deposits, you can draw conclusions of beneficial exploration work of placer and primary deposits. After investigation, only four bedrock out of the 17 sand gold mining areas in the world are quartzite or sandstone, and the rest are