Origin of Material: The raw material for AMIS0407 was supplied by BHP Billiton from the Mamatwan Manganese Mine situated in the Kalahari manganese field, 19 km south of Hotazel, in the Northern Cape Province, South Africa. The ore is a diagenetic to very low grade metamorphic, carbonate-bearing braunitic manganolutite, preserved in the Griqualand West Basin of the 2500 Ma old Neoarchean-Paleoproterozoic Transvaal Supergroup.
Mineral and Chemical Composition: The main manganese mineral is braunite. It is often intergrown with kutnahorite and other minerals (hematite, hausmannite, Mg-calcite, calcite, jacobsite, serpentine and garnet), which are present in variable amounts.
Recommended Concentrations and Limits
(at two Standard Deviations)
Mn M/ICP 35.72 ± 1.02 %
Mn FUS 34.25 ± 3.06 %
Fe M/ICP 4.10 ± 0.26 %
Ca M/ICP 11.04 ± 1.20 %
Specific Gravity 3.74 ± 0.16 %