1·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。
2·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。
3·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。
4·This paper describes basic characteristics of dredging, application of dredging technology in the world beach placer mining, and dredging future.
本文摘要介绍了船采的基本特征，船采工艺在国内外的应用概况以及发展前景。
5·In conducting coastal open air placer mining or shore-based well drilling to exploit seabed mineral resources, effective measures must be taken to prevent pollution to the Marine environment.
露天开采海滨砂矿和从岸上打井开采海底矿产资源，必须采取有效措施，防止污染海洋环境。
6·In this paper, the parametric measurement, the control method and the research on equipment in mining and mineral processing for beach placer are described in detail.
本文详细叙述了海滨砂矿采选工艺中这些参数测量及控制的方法和设备的研究。