The Heintzelman Mine, at Cerro Colorado, Near Tubac, Arizona.
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The large building at top is the storehouse and offices. The mouth of the main shaft is covered by the small building on the left, from whence Peons are issuing with bags of ore. The smelting a
Report of Frederick Brunckow to a committee of the stockholders of the Sonora Exploring & Mining Co., upon the history, resources, and prospects of the company in Arizona, with an appendix by the committee
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