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Telluride District (Upper San Miguel District), San Juan Mts, San Miguel Co., Colorado, USA

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Location is approximate, estimate based on other nearby localities.
 
Latitude & Longitude (WGS84): 37° 56' 15'' North , 107° 48' 42'' West (est.)
Margin of Error:~0km


A former Au-Ag-Pb-Cu-Zn mining district located in the western San Juan Mountains, in the Uncompahgre National Forest. Discovered in 1875.

Mineralization is generally comprised of polymetallic veins (Mineral occurrence model information: Model code: 85; USGS model code: 22c; Deposit model name: Polymetallic veins; Mark3 model number: 46). Controls for ore emplacement include the types of wall rock, vein intersections, character of fault movement, the presence of intersecting dikes and faults, and abrupt changes in strike or dip. Local alteration is propylitic. Volcanic rocks are propylitically altered with epidote, calcite, chlorite, pyrite, sericitic, argillic, and calc-silicate alteration near the veins; quartz-pyrite-sericite, kaolinite, and epidote-rich calc-silicate skarns. Local rocks within the district are comprised of Eocene prevolcanic sedimentary rocks.

Geologic structures:

Local structures include a NW-trending swarm of dikes, fissures, and veins radiating from the Silverton Caldera, forming a belt of fracture zones, ring faults and dikes, cone sheets, and radial dike swarms.

Regional structures include the Paradox Basin of southeastern Utah and Southwestern Colorado (intracratonic basin), trending NW-SE (elongate structure).

Mineral List

Mineral list contains entries from the region specified including sub-localities

28 valid minerals.

Localities in this Region


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References

Koschmann, A.H., and Bergendahl, M.H. (1968), Principal Gold-Producing Districts of the United States: USGS Professional Paper 610, 283 pp.

Mosier, D.L., Menzie, W.D., and Kleinhampl, F.J. (1986), Geologic and grade-tonnage Information on Tertiary Epithermal Precious- and Base-Metal Vein Districts Associated with Volcanic Rocks: USGS Bulletin 1666, 39 pp.

Fisher, F.S. (1990), Gold Deposits in the Sneffels-Telluride and Camp Bird Mining Districts, San Juan Mountains, Colorado, in: Shawe, D.R., Ashley, R.P., and Carter, L.M.H., editors, Gold-Bearing Polymetallic Veins and Replacement Deposits, Part II: USGS Bulletin 1857-F: F12, F18.

Bartos, Paul J. (1993), Comparison of Gold-rich and Gold-poor Quartz-base Metal Veins, Society of Economic Geologists Newsletter, No. 15, 7 pp.

Friedman, Jules D., and Heler, Joan S. (1994), Tectonic Trends of the Northern Part of the Paradox Basin, Southeastern Utah and Southwestern Colorado, as Derived from Landsat Multispectral Scanner Imaging and Geophysical and Geologic Mapping, USGS Bulletin 2000-C,D, 40 pp.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #60001023.

Mineral and/or Locality  
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