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A channel, tunnel, gate or opening purpose-built for moving ore

A silver-gray, metallic element. Symbol, Co

An isometric metallic mineral, Cr

Large grains of Gold

The metamorphic processes which form coal

A carbonaceous rock formed through the alteration of plant remains, used as fuel

A compacted mass of mineral matter

A hardened rock-like mixture of sand or gravel, water, and Portland cement

A processing machine that assists in the separation of particles by weight and density

The heaviest collected particles or minerals reduced from a larger unclassed volume