So the comprehensive evaluation studying of geotechnical engineering environment for metal mining is of great significance.

因此对金属矿山岩土工程环境进行综合评价研究具有重要意义。

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As a country being abundant in coal natural resources, it is a new subject by carrying out phytoremediation technology in heavy metal mining areas.

对于我国这样一个矿业资源丰富的大国，在矿区进行水体重金属修复是一项新的课题。

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Mobility between surface mining, underground mining, coal or metal mining sectors may be limited by differences in production technologies and licensing requirements.

表面开采，地下开采，煤或金属采矿行业之间的流动性可能会因生产技术和许可要求的差异而受限制。

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Severe disruption to platinum group metal mining is expected to reduce supplies from South Africa by over 600, 000 oz.

FORBES: Platinum Prices Get White Hot, Surpass Gold Again

The Nikkei will rid itself of 30 metal, mining and petrochemical companies in favor of mobile-phone and electronics makers.

CNN: The Week Ahead: The Market Story Continues

The materials sector, including metal and mining companies, lagged all industries with a 55% drop in profits and 19% decline in market value.

FORBES: The World's Biggest Companies