Timbers of concrete supporting a shaft opening
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Tag: <span>C</span>
An ore of mercury, 3[HgS]
A rectangular wood plank used for levels in scaffolding
Small fragments of lava or smelter material around 1cm
Ore broken by hand or small tools
A channel, tunnel, gate or opening purpose-built for moving ore
The point at which 2 distinct rock types meet
The genetic association between igneous rocks derived from the same parent magma
Sedimentary rock consisting of rounded pebbles cemented into a solid mass
A crushing machine using a tapered gyrating cylinder revolving on its axis within an outer chamber