Partially metamorphosed volcanic rocks
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Category: <span>M</span>
To surround with a trench or ditch, usually purpose built to hold water
A sulphide ore of arsenic, arsenopyrite. FeAsS
A geological time, 24 million to 5 million years ago, during which modern mammals and birds appeared
The process by which a mineral is first introduced to rock
The process, in whole or partially, of exploiting minerals for human use
A homogenous substance with defined chemical and physical properties, whose constituents are listed on the periodic table of elements
Calculated reserves with an approved plan of extraction
A measure of electric voltage, one-thousandth of a volt
Ore with sufficient values and characteristics to be capable of mechanically milled