Statistics for occurrence #1 of “silver mines” in chapter 12 of Thomas R. Martin, An Overview of Classical Greek History from Mycenae to Alexander:

...hrough their fortified port. They could pay for the food with the huge financial reserves they had accumulated from the dues of the Delian League and the income from their silver mines . The Athenians could also retreat safely behind their walls in the case of attacks by the superior Spartan infantry. From this impregnable position, they could launch sur...
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