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Prospect Mountain, Leadville District, Lake Co., Colorado, USA

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Latitude & Longitude (WGS84): 39° 8' 1'' North , 106° 16' 5'' West
Latitude & Longitude (decimal): 39.13361,-106.26806
Köppen climate type:Dfc : Subarctic climate

Commodities (Major) - Lead; (Trace) - Zinc, Silver
Development Status: Past Producer

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

Mineral List

1 valid mineral.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on

1000 - 1600 Ma

ID: 3295597
Langhoff Gulch Granite

Age: Mesoproterozoic (1000 - 1600 Ma)

Description: Gray, medium-grained, equigranular to inequigranular, massive to weakly flow-foliated, syenogranite, monzogranite, and granodiorite; mostly monzogranite. Contains about 25–35 percent quartz, 20–40 percent plagioclase, 12–45 percent microcline, 4–20 percent biotite, 1–2 percent muscovite, trace to 1 percent sphene, and trace amounts of zircon and apatite; locally contains sparse rutile and garnet. Almost all modal analyses from 19 stained slabs indicate monzogranite composition. Unit typically weathers to distinctive reddish-brown to light grayish-brown rounded to blocky outcrops. Langhoff Gulch, for which unit is formally named, is located in NE1⁄4 sec. 31, T. 12 S., R. 79 W., about 7 km southeast of the town of Granite. Dikes and bodies of rock included with Langhoff Gulch Granite intrude Elephant Rock Granite (Yge) in many places, such as small stocks of massive to foliated, generally gray to pinkish-gray, medium-grained monzogranite and subordinate quartz monzonite in Buena Vista East quadrangle (Keller and others, 2004). New U-Pb zircon age from location U is 1,441±54 Ma (Moscati and others, 2017). The name Langhoff Gulch Granite is herein formalized and location U on map (38°59 17"N., 106°12 45"W., on the USGS Harvard Lakes quadrangle), in a small abandoned quarry near the mouth of Langhoff Gulch, is hereby designated the type locality. The Langhoff Gulch Granite at two other locations has U-Pb zircon ages of 1,435±26 Ma and 1,438±11 Ma (Moscati and others, 2017). Unit includes granitic rocks in Climax quadrangle (McCalpin, Temple, and others, 2012) that are “similar in texture and composition” to the 1,442±2 Ma Silver Plume Granite (Graubard and Mattison, 1990), which is exposed about 50 km northeast of the map area

Reference: Kellogg, K.S., R.R. Shroba, C.A. Ruleman, R.G. Bohannon, W.C. McIntosh, W.R. Premo, M.A. Cosca, R.J. Moscati, T.R. Brandt. Geologic map of the upper Arkansas River valley region, north-central Colorado. doi: 10.3133/sim3382. U.S. Geological Survey Scientific Investigations Map 3382. [186]

1600 - 2500 Ma

ID: 2855911
Granitic rocks of 1700-m.y. age group

Age: Proterozoic (1600 - 2500 Ma)

Stratigraphic Name: Boulder Creek Granite; Cross Creek Granite; Denny Creek Granodiorite; Kroenke Granodiorite; Browns Pass Quartz Monzonite; Powderhorn Granite; Pitts Meadow Granodiorite; Bakers Bridge Granite; Tenmile Granite

Description: Includes Boulder Creek -M.Y. AGE GROUP (AGE 1650-1730 M.Y.)--Includes Boulder Creek, Cross Creek, Denny Creek, Kroenke, Browns Pass, Powderhorn, Pitts Meadow, Bakers Bridge, and Tenmile Granites, Quartz Monzonites, or Granodiorites; also, unnamed granitic rocks

Lithology: Major:{granite}, Minor:{granodiorite,quartz monzonite}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

1600 - 2500 Ma

ID: 3192520
Paleoproterozoic crystalline metamorphic rocks

Age: Proterozoic (1600 - 2500 Ma)

Lithology: Orthogneiss/paragneiss

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

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