Mn Types
Manganese ores of South America are largely of Precambrian age and largely occur in Brazil.
(1) Archean: Matthews Ridge (Guyana), Marau, Urandi, Buritirama
(2) Paleoproterozoic: Azul, Conta Historia, Maripa (Suriname), Morro da Mina, Serra do Navio
(3) Neoproterozoic: Urucum-Mutun
(4) Phanerozoic: Coquimbo (Chile)