Riddle Mine, Riddle, Riddle District, Douglas Co., Oregon, USA
| 'Garnierite'|| Pecoraite|
2 entries listed. 1 valid mineral.
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Mining Annual Review (1985): 326. A nickel mine owned by Hanna Mining Co. Produced 8,000 tons Ni in ferronickel (1984); capacity is 8,200 tons/year. Closed in 1987.
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