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In page Roman Empire:

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The main mining regions of the Empire were the Iberian Peninsula (silver, copper, lead, iron and gold);[1] Gaul (gold, silver, iron);[2] Britain (mainly iron, lead, tin),[3] the Danubian provinces (gold, iron);[4] Macedonia and Thrace (gold, silver); and Asia Minor (gold, silver, iron, tin). Intensive large-scale mining—of alluvial deposits, and by means of open-cast mining and underground mining—took place from the reign of Augustus up to the early 3rd century, when the instability of the Empire disrupted production.[citation needed]