Marine sedimentary manganese deposits form where manganese is chemically concentrated and precipitated within sedimentary environments. Subsequent weathering and groundwater processes may produce supergene enrichment, increasing manganese grades near the surface. Mineralogy, oxidation state, impurities, and the degree of enrichment influence resource quality and processing requirements.
The following Elements and Minerals may be found in this Deposit Type.
Mineral: Pyrolusite - MnO₂ - Pyrolusite is a major manganese oxide and the most common manganese ore mineral.