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1. Boyle Bros. on Porphyry Ridge

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Boyle Brothers drill on hole PR-7 on Porphyry Ridge above Lower Fulford in the Fulford Mining District.

2. Examining ore core

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From left, Paul Roebling, Clarence and Helen Dubach examining ore core by barn in Triangle Park. Photograph is dated November/December 1966.

3. Boyle Bros. Diamond Drill

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The Boyle Bros. diamond drill on Hole PR-3 in Upper Town, Fulford, Colorado.
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