In which a long history of placer gold mining.

其中砂金开采历史悠久.

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The operation practice indicated that the remining of placer gold in Laozuoshan Gold Mine was efficacious.

生产实践表明,采金船复采在老柞山金矿的应用是行之有效的.

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A new technic of purifying gold, silver from placer gold without pollution was proposed.

提出了一种无污染从砂金中提纯金 、 银新工艺.

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The fineness of placer gold in this district is apparently featured by inhomogeneity, inheritance and afterdeformation.

该区砂金成色具有明显的不均一性 、 继承性和后期改造性.

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The associated minerals are the important indicator of the genesis and enrichment of placer gold.

伴生矿物是砂金成因和富集规律的重要指示标志.

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Eraluating the mined area is one of effective and dependable ways for exploring placer gold.

指出以过采区为依据寻找砂金矿可靠性大,风险度小,是行之有效的途径之一.

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