It is assigned by the placer.

它是由放置器指定的。

Indonesia is rich in gold placer resources.

印度尼西亚砂金资源丰富。

Placer deposit is highly developed in USSR.

苏联的砂矿矿床比较丰富。

The origin of the deposit belongs to Quarternary eluvial placer type.

矿床成因属第四纪残积型。

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。

Site investigation drill and placer exploration drill have much in common.

工程勘察钻机和砂矿钻机之间具有许多共同之处。

Shore REE placer is one of the most important exogenetic ore deposits of REE.

外生稀土矿床中最重要的是海滨砂矿。

This primitive form of placer mining is still used in some places for panning gold.

这种原始的砂矿开采形式至今还在一些地方用来淘金。

Liaoning Xiuyan nephrite Placer deposit (XNPD) is a secondary deposit of primary nephrite ore.

辽宁岫岩软玉砂矿(又称河磨玉矿)是原生软玉矿的次生砂矿床。

I got educated on placer mining, and heard all about the controversy over the use of water cannons.

我得到的教育砂金开采，并听取了所有的争议，使用水炮。

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。

Placer mining is based on the FACT that heavier substances can be separated from lighter ones in water.

较重的物质可在水中与较轻的物质分离，砂矿开采正是利用这个原理。

Distribution of gold placer deposits is closely related with gold-bearing horizon, morphology and tectonism.

使金重新分布，砂金分布与金源、地貌和新构造运动关系密切。

Roseville is located in Placer County and is nearly equidistant from the Sierra Nevadas and the Pacific Coast.

罗斯维尔位于普莱瑟郡，距离塞拉利昂内华达州和太平洋海岸几乎相同。

Tungsten mineralization types in Yaoling zone are divided into quartz vein, greisen, altered granite and placer.

瑶岭钨矿带钨矿成因类型有石英脉（带）型、云英岩型、蚀变花岗岩型和砂矿床。

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。

Platinum is found usually as alloys of 80-90% purity in placer deposits or more rarely combined with arsenic or sulfur.

通常铂在砂矿中以合金形式存在，其中包含80～90%的纯铂，或者不多见的是与砷或硫结合在一起。

The regenerated mineralization of placer gold by thawing action are also proved through simulation, contrast and experiment.

并通过模拟对比实验结果，论证了融冻作用使砂金再生成矿。

Placer gold samples are rich in light REE, the characteristics of REE contents of which partly inherited from hard rock gold.

砂金样品则以较富集轻稀土为特征，稀土元素含量继承了岩金的部分特点。

Owing to the metallogenetic inheritance of placer gold and mountain gold, their liquid-inclusion composition are very similar.

由于成矿作用的继承性、砂金的气液包体成分同原生的金十分相似。

The studied platinum - gold placer occurs in Quaternary alluvial - diluvial a piedmont valley of ultrabasic rocks, Northwest China.

该铂- 金砂矿产于超基性岩体山前谷地的第四纪冲积- 洪积层中。

The Luohe gold-bearing Placer was formed by the intensive denudation of the dispersive mineralization of gold in the upper catchpit.

洛河砂金矿是在上淤汇水盆地中金的分散矿化被强烈剥蚀下形成的。

The writer takes Baishui gold placer as an example and suggests a "synthetic block method"for the calculation of gold placer reserves.

作者以白水砂金矿为例，提出合成块段法计算砂金储量的方法。

Thailand is one of main countries producing tin in the world, and its ore deposit types are the shallow-sea deposit placer tin in main.

泰国是世界上产锡的主要国家之一，其矿床类型主要是浅海沉积型砂锡矿。

Thus it will guarantee the primary placer gold sampling and reduce the Labour intensity of workers, in order to raise the drilling efficiency.

从而能保证取出原生矿样，并降低工人的劳动强度，实现钻进的高效率。

Placer tin deposit in xupu occurs in alluvial sediment of quatemary system and cassiterite chiefly concentrates at the bottom of gravel layers.

溆浦砂锡矿床赋存在第四系冲积层中锡石主要富集在底部砂砾石层。

Placer tin deposit in Xupu occurs in alluvial sediment of Quatemary SyStem and CaSSiterite chiefly concentrates at the bottom of Gravel layers.

溆浦砂锡矿床赋存在第四系冲积层中，锡石主要富集在底部砂砾石层。