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This geological map of the district of Toboali (Bangka Island, east of Sumatra) uses colours to depict types of rocks, soils and minerals. Tin mining areas are also highlighted.

A geological map showing the types of rock and minerals found in Blinjoe district on the island of Bangka, off the east coast of Sumatra. Deposits of iron, quartz and tin are marked, and coral is shown at the coast.