Statistics for occurrence #1 of “silver mines” in chapter 12, section 1, subsection 14 of Thomas R. Martin, An Overview of Classical Greek History from Mycenae to Alexander:

...d imported by sea even more heavily than in the past. The damage to Athenian fortunes increased when twenty thousand slaves owned by the state and who worked in Athens' silver mines ran away to seek refuge in the Spartan camp. The loss of these slave miners put a stop to the flow of revenue from the veins of silver ore. So immense was the distress ca...
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