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 "snippet": " Estimates of the number and size of undiscovered mineral deposits in the US containing gold, silver copper, lead, and zinc. We show permissive tracts, areas where geological analysis indicates that deposits of a specific type may occur shallower than 1km.",
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 "summary": " Estimates of the number and size of undiscovered mineral deposits in the US containing gold, silver copper, lead, and zinc. We show permissive tracts, areas where geological analysis indicates that deposits of a specific type may occur shallower than 1km.",
 "title": "National Mineral Resource Assessment 1998",
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