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。
2
It is widely used to separate ferrous, nonferrous, nonmetal and rare metal minerals. such as gold mine, copper mine, lead-zinc ore, tinmine 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。
3
The cause of mine pillar destruction in in Dachang Tongkeng TinMine was analyzed from observation by photoelastic stressmeter embedded in mine stope 570.