在采矿作业中，平行铁轨早已被用来运送大件的货物，但马匹仍然是主要的运输工具。
Parallel rails had long been used in mining operations to move bigger loads, but horses were still the primary source of power.
柴油铲运机是地下采矿作业中的高效运矿设备。
Diesel driven LHD units are highly efficient ore hauling equipment in underground mining operations.
寻找新矿物质的来源可能包括采矿作业的尾矿和生活垃圾。
Such sources could include tailings from mining operations and consumer waste.
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