Asking the pikas politely…
RESOURCE Ouray is located in a region of high heat flow, about 170 mW/ m (Zacharakis, 1981). Active faulting and a moderate to high level of seismic activity also characterize the region that lies in the northern portion of the San Juan Mountains, among the youngest mountains in Colorado. The San Juans are composed primarily of Tertiary volcanic rocks that were deposited upon an already varied topography of horst and graben, basin, and dome (McCarthy, 1981). Post volcanic caldera collapse and resurgence produced ring faults and radial fractures that provide an avenue for hydrothermal solutions and base metal precipitation (Burbank, 1941). The Ouray Graben is an east-west trending feature bordered by the Sneffels Horst to the south, and the Uncompahgre Uplift to the north-northwest (Baars and See, 1968). Ouray is bounded by the Ouray Fault to the south which is associated with the hot springs at Box Canyon. The Ouray Fault is one of several faults of NNW to ENE trend that make up the complex 5 km (3 miles) wide fault zone (Meyer et al, 1982).
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