A stage in coal formation when biochemical action is exhausted
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A primitive milling process whereby ore is placed in a round, rock lined pit and milled by a series of blocks or crushers, suspended by beams radiating from the centre of the pit
The grinding of ore in a rotating cylinder using larger pieces of usually homogenous ore to grind down smaller pieces into finer grades
Sandstone with high feldspar content, usually coarse-grained and pink to red
A substance containing gold
A monatomic, inert, colourless gas. Symbol, Ar. Used in light bulbs and fluorescent tubes
A simple rotary, gear-driven drilling device
A type of rock deriving from clay or silt, also lacking the cleavage distinctive of slate
The process of bombarding matter with energy, creating an excited state of the said matter to facilitate the measurement of reflection and/or absorption of the said energy, thereby determining its mineral constituents from correlative readings. This process is used in X-Ray Fluorescent (XRF) mineral determination
A group of igneous and volcanic rocks between the Atlantic suite and the Pacific suite