TYPE CHROMIUM DEPOSITS BUSHVELD

TYPE CHROMIUM DEPOSITS BUSHVELD

Geological features: chromite occurs at the base and intermediate areas of a layered sequence of mafia to ultramafic igneous nature.

Tectonic relationship: cratonic areas

Age of mineralization: Precambrian but appears to tertiary

Associated rock types: basic and ultrabasic rocks

Form of deposits: stratified and lenticular

Structure and texture: texture layering, scattered accumulation

ore minerals: chromite, ilmenite, pyrrhotite, pentlandite

Gangue minerals: olivine, plagioclase, pyroxene.

Weathering: chromites residual and alluvial soils

Control of mineralization: anostoxitas, and orthopyroxene mainly dunites

Tonnage and typical law: 20-60% chromium oxide III and reserves of 1 to several million MT.