That part of a company’s ore reserve that can only be accessed following certain capital expenditure which has yet to be approved.
Craton:
A part of the earth’s crust that has attained stability and has been little deformed for a long period of geological time.
Diorite:
A group of plutonic rocks intermediate in composition between acidic and basic.
Felsic:
An igneous rock having abundant light coloured minerals.
Graben:
A block of rock that lies between two faults, and has moved downward to form a depression between two adjacent fault blocks.
Greenstone:
A field term for any compact dark green altered or metamorphosed basic igneous rock that owes its colour to chlorite.
Horst:
A block of rock that lies between two faults and has moved upward relative to the two adjacent fault blocks.
Kaapvaal Craton:
The ancient protocontinental basement of South Africa.
Lacustrine:
Pertaining to sediments formed in lakes.
Mafic:
An igneous rock composed chiefly of dark, ferromagnesium minerals.
Ophiolite:
A group of mafic and ultramafic igneous rocks derived by metamorphism, whose origin is associated with an early phase of the development of a geosyncline.
Plunge:
The inclination of a fold axis or other linear feature, measured in the vertical plane.
Sub-outcrop:
A rock stratum that unconformably underlies another rock stratum.
Syncline:
Concave fold in stratified rock, in which strata dip down to meet in a trough.
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