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Maid of Orleans (Jumbo; Little Jumbo), Montezuma area, Summit Co., Colorado, USA

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Latitude & Longitude (WGS84): 39° 36' 1'' North , 105° 51' 7'' West
Latitude & Longitude (decimal): 39.60056,-105.85222
Köppen climate type:Dfc : Subarctic climate

Commodities (Major) - Lead, Copper, Zinc, Gold, Silver
Development Status: Producer

Commodity List

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

Mineral List

11 valid minerals.

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 Macrostrat.org

Miocene - Eocene
5.333 - 56 Ma

ID: 2805446
Middle Tertiary intrusive rocks

Age: Cenozoic (5.333 - 56 Ma)

Description: Intermediate to felsic compositions

Lithology: Major:{mafic hypabyssal,felsic hypabyssal}

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]

33.9 - 56 Ma

ID: 2208786
Rocks of Montezuma stock and vicinity, Monzogranite porphyry

Age: Eocene (33.9 - 56 Ma)

Description: Light-tan to gray, medium-grained, porphyritic, alkali-calcic monzogranite and granodiorite with euhedral to subhedral phenocrysts of orthoclase and quartz. Chemical composition indicates alkali-calcic granodiorite (Ed Dewitt, written commun., 2007). Orthoclase phenocrysts form as much as 20 percent of rock and are locally reported as long as 10 cm (Lovering, 1935). Quartz phenocrysts form as much as 10 percent of rock and are commonly partially resorbed. Matrix contains orthoclase, plagioclase, quartz, as much as 3 percent biotite, and trace amounts of hornblende, magnetite, and sphene. Locally includes light-pink aplite dikes (bma) not mapped separately. Includes several small intrusive bodies near Montezuma stock. Zircon fission-track ages between 39.8±4.2 and 34.8±3.7 Ma (Bookstrom and others, 1987); Cunningham and others (1994) reported a zircon fission-track age of 35.0±3.2 Ma; one K-Ar age is 37.0±1.4 Ma (Marvin and others, 1989)

Reference: Kellogg, K.S., Shroba, R.R., Bryant, Bruce, and Premo, W.R. Geologic Map of the Denver West 30' x 60' Quadrangle, North- Central Colorado. USGS Geologic Investigations Series 3000. [35]

1600 - 2500 Ma

ID: 3186950
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 Macrostrat.org, used under Creative Commons Attribution 4.0 License

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


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