Geology and structural control of ore deposition in the Creede district, San Juan Mountains, Colorado

Application of structural geology to mineral and energy resources of the Central and Western United States

“…3), which host the major epithermal base-and precious-metal veins of the Creede District (Steven and Ratte, 1965;Steven and Lipman, 1976;Lipman and Sawyer, 1988;Lipman and others, 1989). The caldera-related ash-flow sheets of the central cluster represent some of the largest volume pyroclastic eruptions known in Earth history (at least 3,000 km3 for the 27.8-Ma Fish Canyon Tuft) and vary in composition from dacite to lowsilica rhyolite, in contrast to the high-silica rhyolite tuff erupted from the Questa caldera.…”

Trace Element Concentration and Speciation in Selected Mining-Contaminated Soils and Water in Willow Creek Floodplain, Colorado

“…Glucose is the primary product of photosynthesis, with acetate (OAc) forming from the glucose as plants decompose. In comparison, Kimball et al [38] found the stream water at the injection point in West Willow Creek a CaHCO 3 -CaSO 4 type water, reflecting the chemical weathering of bedrock in the watershed [44]. Kimball et al [38] further determined these ions and pH remained constant until the inflow of the Nelson Tunnel, at which point the chemical character of water changed to a CaSO 4 type, and pH was lower.…”

“…The area beneath Creede and southward to the confluence of Willow Creek and the Rio Grande is predominately the Creede Formation which is mostly lake and river deposits of reworked ash, sand and gravel, and travertine deposits from numerous mineral hot springs forming after the eruption of the Creede Caldera [41]. Much of the older rocks in the lower part of the water- shed, especially along the waterways, are covered by Quaternary alluvium from Willow Creek and the Rio Grande [44]. The Willow Creek watershed has a 1.6 km vertical relief and is characterized by steep slopes and distinct vegetative communities.…”

Mineral resource potential of National Forest RARE II and wilderness areas in Colorado

“…The Creede mining district, several miles south of the study area, produced significant amounts of gold, silver, lead, and zinc from vein deposits along a system northwest of Creede. These deposits are related to the collapse of the Creede caldera, but are not believed to extend into the study area (Steven and Ratte", 1965). In the central part of the study area a large area of hydrothermally altered rocks is cut by numerous quartz-pyrite veins, some of which contain sparse, local concentrations of base and precious metals.…”

“…The study area is underlain by Tertiary rhyolite and latite flows and tuffs related to the La Garita, Creede, and San Luis calderas Ratte and Steven, 1967;. The Creede mining district adjacent to the western boundary of the study area has produced gold, silver, lead, and zinc from vein deposits in a fractured graben trending northwest from Creede (Steven and Ratte, 1965). These ore deposits are adjacent to the study area, but are not known to extend into it.…”