placer mining的例句大全

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.

About Environmental Protection in Gold Placer Mining Design

砂金矿开采设计中的环保问题

Boulder is a special issue for gold placer mining. The article expounds the distribution regularity of boulder in different sections of the alluvial gold placer and points out the impacts of boulder in mining and the issues that shall be concerned for mining and design.

巨砾是砂金矿开采时遇到的特殊问题，本文阐述了巨砾在河流冲积砂金矿床不同地段的分布规律，指出巨砾对矿床开采的影响，及在开采、设计中应注意的问题。

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.

Sur face hydraulic mining of Placer in China

我国砂矿的露天水力开采

In which a long history of placer gold mining.

其中砂金开采历史悠久.

On ways to reduce placer gold loss in mining and dressing processes

采选工艺过程中减少砂金流失途径的探讨

Study on automatic control of mining and mineral processing for beach placer

海滨砂矿采选工艺自动控制的研究

In the last few years, the studies on amelioration and utilization of frozen soils are on the upgrade. There is a good beginning in the studies on placer gold mining and utilization of thermal pile in cold regions.

冻土改造和利用兴起，在寒区砂金矿开采、热桩利用等方面有了良好的开端。

Discussion on placer gold mining methods in permafrost area

关于永久冻结砂金矿开采方法的探讨

Research on Placer Gold Mining under Paddy Field-the Technology of Biological Field Recovery

稻田砂金开采生物复田技术研究