Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Alma Lincoln Mine, Idaho Springs District, Clear Creek Co., Colorado, USA

This page is currently not sponsored. Click here to sponsor this page.
Lock Map
Latitude & Longitude (WGS84): 39° 44' 57'' North , 105° 33' 1'' West
Latitude & Longitude (decimal): 39.74931,-105.55030
GeoHash:G#: 9xhfnhhse
Locality type:Mine
Köppen climate type:Dfc : Subarctic climate
Other/historical names associated with this locality:Alma-Lincoln Mine

Located on S side of Clear Creek,about 1 mile W of Idaho Springs,in NW1/4,sect.34,T.3S.,R.73W.,at an elevatoin of about 8000'.
Consists of 3 adits,all connected by crosscuts and raises.
Explored 5 viens(Lincoln,South Lincoln,Josephine,Elliot&Barker,Donna Juanita).
Production (1902-1950)=10689 tons of ore,yeilding:41074 ozs.Au,170169 ozs.Ag,443238 lbs.Cu,2064999 lbs.Pb,and 78384 lbs.Zn.
Reference:USGS OFR 66-87(Moench,1966)

Mineral List

23 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

Late Pleistocene
0.0117 - 0.126 Ma

ID: 2208225
Young stream-terrace alluvium

Age: Pleistocene (0.0117 - 0.126 Ma)

Description: Glacial outwash composed chiefly of cobbly pebble gravel that underlies one terrace (locally two) along streams in major mountain valleys near and below lower limit of glaciation and fluvial deposits of nonglacial origin along Pole Creek near Tabernash. Amount and size of small boulders (commonly 30–50 cm in diameter) and cobbles in deposits decrease downstream from ice-contact deposits. Pebbly sand or silty overbank sediments less than about 50 cm thick locally overlie the gravel. Fluvial deposits of nonglacial origin north of Pole Creek, about 1 km southwest of Tabernash, consist of slightly cobbly pebble gravel overlain by about 35 cm of slightly pebbly, sandy, clayey silt overbank sediment. Deposits of unit Qg1 in glaciated valleys are composed of gravelly glacial outwash deposited during the Pinedale glaciation, about 30–12 ka (Nelson and others, 1979; Madole, 1986; Benson and others, 2004, 2005). Cosmogenic dating (based on measurement of isotopes 10Be and 26Al) of Pinedale outwash, 4–14 m above stream level in Boulder Canyon east of Nederland, yielded exposure ages of 32–10 ka (Schildgen and others, 2002). Unit underlies terrace treads commonly about 6 and 12 m above the Fraser River between Winter Park and Fraser, about 5 m above the Fraser River near Tabernash, about 5–9 m above streams tributary to the Fraser River, and commonly less 3 than 12 m above stream level elsewhere in map area. Unit locally may include a minor amount of valley-floor alluvium (Qva). Along Swan River, near southwest corner of map area, unit Qg1 includes extensive dredge tailings produced by placer mining during the late 1880s. Unit Qg1 is a source of coarse aggregate. Estimated thickness 3–20 m

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: 2957947
Biotitic gneiss, schist, and migmatite

Age: Proterozoic (1600 - 2500 Ma)

Description: Locally contains minor hornblende gneiss, calc-silicate rock, quartzite, and marble. Derived principally from sedimentary rocks

Lithology: Major:{biotite gneiss,schist,migmatite}, Minor:{gneiss,calc silicate schist,marble}

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: 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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
U.S. Geological Survey Professional Paper 371

Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: June 16, 2019 00:14:35 Page generated: May 12, 2018 23:37:29
Go to top of page