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Mineral mining
The extraction of valuable minerals or other geological materials from the earth for economic interests.
Industry: Mining
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Mineral mining
差距包裝
Mining; General mining
一種包裝為包含的門側包 3 到 5 yd (2.7 至 4.6 米) 寬下, 一步的缺口至少的道路維修道路,和最後一大包 5 到 7 yd (4.6 到 6.4 m) 寬寬度的方法。廢物包進行至少 2 yd (1.8 米) 寬和不小於寬度的兩倍的煤層厚度。在小條包裝中提供的差距都有明確的支援和允許屋頂分手並流向他們。這投入在地層中張力在道路並降低骨折和迷戀。 ...
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