Any item or instrument from which a price or purpose may be assigned
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Category: <span>A</span>
The amount of work required to be performed, by law, in order to retain possession of mining rights
A test performed on a mineral sample to determine its composition
The inorganic byproduct of combustion
A silicate mineral whose thin, strong fibers separate readily. Used in heat resistance. Known for causing terminal respiratory illness
A steel-gray and brittle metal. Symbol, As. Highly poisonous
A stage in coal formation when biochemical action is exhausted
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