An unidentified man searches for tin ore at a sub-Saharan mine.

在撒哈拉以南的矿区，一位身份不明的男子正在寻找锡矿。

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It is widely used to separate ferrous, nonferrous, nonmetal and rare metal minerals. such as gold mine, copper mine, lead-zinc ore, tin mine and so on.

它广泛用于单独的黑色，有色金属，非金属和稀有金属矿物。如金矿，铜矿，铅，锌矿砂，锡矿山等。

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The cause of mine pillar destruction in in Dachang Tongkeng Tin Mine was analyzed from observation by photoelastic stressmeter embedded in mine stope 570.

通过对埋设于570中段光弹性应力计的观测，分析了该中段矿柱破坏的情况及原因。

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Exploration work at a former tin mine in Cornwall may stop because of rising costs concerns, investors say.

BBC: South Crofty tin mine exploration 'could stop'

Elsewhere, an extra pump has been brought in to help stop water from the old Wheal Jane tin mine overflowing.

BBC: Looe main access roads hit by landslips

Dr Carter and his graduate students have been experimenting with a dummy mine in a cake tin full of sand.

ECONOMIST: Landmines: Clearing the killing fields | The