Statistics for occurrence #1 of “silver mines” in chapter 9 of Thomas R. Martin, An Overview of Classical Greek History from Mycenae to Alexander:

...ted the Athenian interpretation of their success in helping to turn back the Persians, in achieving leadership of a powerful naval alliance, and in controlling, from their silver mines and the allies' dues, an amount of revenue which made Athens richer than all its neighbors in mainland Greece. The Parthenon, like the rest of the Periclean building prog...
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