Underground mines need high-volume mine skips that can move vast quantities of raw ore to the surface at once. For instance, in its natural form, gold ore isn't pure gold at all. Smelting and separation procedures must isolate the gold from impurities and minerals like quartz and silver. If gold mines hope to increase their volume, they need to move more ore.
http://www.wabicorp.com/custom-made-ore-skips-reach-deepest-depths-earth/
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