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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.
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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.
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3) Prospecting at Glengarry
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Front: "Don single jacking, Glengarry mine" MacDonald knight using a hammer and drilling steel to create holes in rock. From the USDA Forest Service website: "Single jacking involves an individual holding a drilling steel in one hand and hitting it with a hammer held in the other. The single jacks have 3- or 4-pound heads and 10-inch handles. The short handle helps you place blows accurately and resists breaking better than longer handles. Engineer's...
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4) 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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