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- Pumping operations in the Cripple Creek district, Colo.
- Operations and costs at the St. Joe Mining & Milling Co., Boulder, Colo.
- Mining and milling methods and costs at the Alice Unit of the American Smelting & Refining Co., Alice, Colo.
- Mining and milling methods and costs at the Black Hills Tin Co., Tinton, S. Dak.