World Library  
Flag as Inappropriate
Email this Article

Colorado Mineral Belt

Article Id: WHEBN0000044965
Reproduction Date:

Title: Colorado Mineral Belt  
Author: World Heritage Encyclopedia
Language: English
Subject: San Juan Mountains, Geography of Colorado, Index of Colorado-related articles, Colorado, Crime in Colorado
Collection: Mining in Colorado, Regions of Colorado
Publisher: World Heritage Encyclopedia

Colorado Mineral Belt

Approximate boundaries of the Colorado Mineral Belt with inner area having principal mining districts.[1]

The Colorado Mineral Belt (CMB) is an area of ore deposits from the La Plata Mountains in Southwestern Colorado to near the middle of the state at Boulder, Colorado and from which over 25 million troy ounces (778 t) of gold were extracted beginning in 1858. The belt is a "northeast-striking zone defined by: a Proterozoic shear zone system (McCoy, 2001); a suite of Laramide-aged plutons and related ore deposits (Tweto and Sims, 1963); a major gravity low (Isaacson and Smithson, 1976); low-crustal velocities; and high heat flow (Decker et al., 1988)."[2] Mining districts include:[1]

The belt lies within a zone that has been geologically active at intervals beginning from near the time of crustal accretion in central Colorado at least 1.6 billion years ago until the present. Parts of the CMB follow shear zones of Precambrian age[1] and the Paleozoic and Mesozoic. Igneous rocks intruded about 60 to 70 million years ago during the Laramide orogeny are associated with the belt and once were thought to be responsible for most of the ore deposits.[3] Now many of the important ore deposits are thought to be genetically related to younger magmatism, some at least as young as about 25 million years.


  1. ^ a b Tweto, Ogden; Sims, Paul K. (1963) (abstract with link to PDF). Precambrian Ancestry of the Colorado Mineral Belt. (Report). Bulletin 74. Geological Society of America. pp. 991-1014. Retrieved 2014-03-02.
  2. ^ CD-ROM Working Group, Structure and Evolution of the Lithosphere Beneath the Rocky Mountains: Initial Results from the CD-ROM Experiment. GSA Today 12, #3, p. 4-10, 2002. [2]
  3. ^ Charles G. Cunningham, et al (1994). Ages of Selected Intrusive Rocks and Associated Ore Deposits in the Colorado Mineral Belt (Report). Bulletin 2109. United States Geological Survey. Retrieved 2014-03-02.

External links

  • Map of the Colorado Mineral Belt
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from World eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.