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William Franklin and his daughter, Cora Stone, found the Black Hills' richest rock on this date in 1894. Stone picked up a chip of quartz loaded with gold at the base of Mount Aetna. Franklin traveled 20 miles to Rapid City to make the claim and stayed a few days to celebrate his new wealth. When he went home to Keystone, he soothed his angry wife by telling her the new mine was named after her. The Holy Terror Mine became one of the richest in the Black Hills.