The conditions and result of a commercial scale trial of gold extraction from stripped barrenore by heap leaching process are reported.
介绍了用堆浸法从剥离贫矿石中回收黄金的工业试验条件及结果。
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Escondida means "hidden" in Spanish, and it refers to the fact that the copper ore body was buried beneath hundreds of meters of barren rock, and the surface geology gave no signs of its presence.
On a recent rainy afternoon, Zeng Guohui, a 41-year-old laborer, walked to an abandoned mine where he used to shovel ore, and pointed out still-barren expanses of dirt and mud.