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Similarly, the greenstones are also known for their significant deposits of bauxite, manganese and diamonds, along with lesser copper, molybdenum, lead-zinc, chrome and nickel.
During the Tertiary and Quaternary periods, the Guiana Shield has undergone continuous passive subsidence along its oceanic margin, creating deep (2,500m - 4,800m) and mostly offshore sedimentary basins prospective for oil.
REGIONAL GOLD ENDOWMENT The Imataca Complex incorporates substantial iron ore deposits in Venezuela, comparable to similar deposits within Archaean portions of the Leo-Man Shield in Liberia, Guinea and Sierra Leone of West Africa.
Just as the Birimian Series of West Africa is noted for its substantial gold endowment, the lesser explored Barama-Mazaruni Greenstones of Guyana and their equivalents in adjacent countries include several significant gold occurrences such as Omai in Guyana, El Callo, Las Christinas and Brisas in Venezuela, Gross Rosebel in Suriname, and Camp Caiman, Dorlin and Yaou in French Guiana (see Figure below).
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The substantial bauxite deposits of the Guiana Shield typically occur at the contact between recent unconsolidated sediments of the Berbice Formation and the basement successions.