| 翻訳と辞書 |
| gold prospecting ： ウィキペディア英語版 |
gold prospecting
Gold prospecting is the act of searching for new gold deposits. Methods used vary with the type of deposit sought and the resources of the prospector. Although traditionally a commercial activity, in some developed countries placer gold prospecting has also become a popular outdoor recreation.
==Prospecting for placer gold==
Prospecting for placer gold is normally done with a gold pan or similar instrument to wash free gold particles from loose surface sediment.〔J.M. West (1971) ''How to Mine and Prospect for Placer Gold'', US Bureau of Mines, Information Circular 8517.〕 The use of gold pans is centuries old, but is still common among prospectors and miners with little financial backing.
Deeper placer deposits may be sampled by trenching or drilling.〔J.G. Stone and others, "Using diamond drilling to evaluate a placer deposit: a case study," ''Mining Engineering'', September 1988, p.875-880.〕 Geophysical methods such as seismic, gravity or magnetics may be used to locate buried river channels that are likely locations for placer gold.〔Scott A. Stebbins (1987) ''Cost Estimation Handbook for Small Placer Mines'', US Bureau of Mines, Information Circular 9170.〕 Sampling and assaying a placer gold deposit to determine its economic viability is subject to many pitfalls.〔''Placer Examination Principles and Practice'' (n.d.) US Bureau of Land Management, Technical Bulletin 4.〕
Once placer gold is discovered, the gold pan is usually replaced by sluices or mechanical devices to wash greater volumes of material. Discovery of placer gold has often resulted in discovery of hardrock gold deposits when the placers are traced to their sources.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「gold prospecting」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|