One of the more tangible benefits that accrued to Rome from the conquest of an empire was the acquisition of significant mineral resources, significant because Italy, although rich in iron, could not provide a sufficient supply of the whole range of metals needed by the Roman state for coinage and by members of the élite for the luxury artefacts that helped to enhance their social status. Once Rome had gained control over metalliferous regions of the Mediterranean, Romans, and especially Italians, were not slow to become involved in mining overseas, while the state came to gain considerable revenue from the leasing of contracts for the right to exploit state-owned mineral resources.
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J. C. Edmondson (1989) studied this question.
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