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Cinders

Small fragments of lava or smelter material around 1cm

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Chute

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

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Cobalt

A silver-gray, metallic element. Symbol, Co

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Conglomerate

Sedimentary rock consisting of rounded pebbles cemented into a solid mass

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Cone crusher

A crushing machine using a tapered gyrating cylinder revolving on its axis within an outer chamber

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Concrete

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