placer mining

用法例句

A place where a placer deposit is washed to extract its mineral content.

砂矿开采地一个用来清洗出有用矿物的砂矿开采地

Mechanized placer mining, with special devices for washing and separating waste from valuable minerals, is used in productive alluvial deposits.

机械化砂矿开采用于含矿量丰富的砂矿床．利用专门设备来淘洗、分离废物与有用矿物。

Dredging is the most important placer-mining method today.

挖掘法现在是最重要的砂矿开采的方法。

Placer mining: Oldest method of recovering gold from alluvial deposits.

砂矿开采:从冲积层回收黄金的最古老方法。

The feasibility analysis of shore mineral exploitation of madagascar

马达加斯加海滨砂矿开采的可行性分析

In its most basic form, all the equipment a placer miner needs is a pan and flowing water.

在最原始的砂矿开采中，砂矿工人所需的设备只是一个淘沙盘和流水。

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。

Strengthening Management and Protection of Sand,Stone and Clay Resources;

加强砂石土开采管理,切实保护矿产资源

Predicting Study on Inrush of Sand and Overburden Failure of the Full Mechanized Top-coal Caving under Loosening Sandstone Aquifer in the Tie-bei Coal Mine;

铁北煤矿松软砂岩含水层下综放开采覆岩破坏及溃砂预测研究

A Study on the Engineering Geology Characteristics and on the Mechanics of Water and Sand Bursting from the Overlying Strata of Mining Coal Seam in Qidong Coalmine;

祁东煤矿开采煤层上覆岩土体工程地质特征与突水溃砂机理研究

MINING PLAN AT DEPTH OF BAGUAMIAO GOLD DEPOSIT IN SHAANXI PROVINCE--Discussion on filling treatment of goaf of mullock heaps and tailings by means of open-stope method

陕西八卦庙金矿床深部开采方案——空场采矿法废石尾砂空区充填处理的讨论

To discover and open(a vein or deposit) in mining.

采采矿时发现和开采出（矿脉或矿床）

sluice ore,ie to separate it from gravel,etc

冲洗矿砂（使之与砂砾等分开）

Mining Technical Study on the 2nd Sandstone in Baoshan Western Ore

宝山矿西部2号砂岩矿体采矿技术研究

mining concession

矿山开采（特许）权

To extract from a mine or from mined ore.

开采从矿或矿石中提取

To excavate the earth for the purpose of extracting ore or minerals.

开矿，采矿为开采矿石或矿物而挖掘土地

retreating mining method

后退式开采法(采矿)