英和和英

出典:『Wikipedia』 (2011/07/14 22:10 UTC 版)

英語による解説

引用

Uranium mining is the process of extraction of uranium ore from the ground. As uranium ore is mostly present at relatively low concentrations, most uranium mining is very volume-intensive, and thus tends to be undertaken as open-pit mining. It is also undertaken in only a small number of countries of the world, partly because sufficiently high uranium concentrations to motivate mining at current prices are rare.