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    • Four Mile Canyon

    • Four Mile Canyon

    • A lattice of pine boughs and grasses lies on a pile of mine tailings in order to prevent its erosion. The pile is in Fourmile Canyon in Boulder County, Colorado.

    • Boulder County (Colo.)--1950-1960.; Tailings (Metallurgy)--Colorado--Boulder County--1950-1960.

    • 1958

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