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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)." Mining districts include:[2]

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  • Colorado Mineral Belt (en)
  • Colorado Mineral Belt (it)
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  • 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)." Mining districts include:[2] (en)
  • La Cinta mineraria del Colorado (in lingua inglese: Colorado Mineral Belt, abbreviata in CMB) è un'area di giacimenti minerari che va dalle montagne di La Plata nel Colorado sud-occidentale fino al Boulder, al centro dello Stato. Un'ipotesi recente, invece, collega i giacimenti più importanti a fenomeni magmatici più recenti, alcuni dei quali sono iniziati 25 milioni di anni di fa. (it)
name
  • Colorado Mineral Belt (en)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath/CO_Mineral_Belt.jpg
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date
  • March 2014 (en)
location
  • Colorado (en)
map caption
  • Approximate boundaries of the Colorado Mineral Belt with inner area having principal mining districts. (en)
map image
  • CO Mineral Belt.jpg (en)
reason
  • What is the name of the larger "zone"? (en)
has abstract
  • 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)." Mining districts include:[2] * district * Leadville mining district, named for Leadville, Colorado * district 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 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. 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. (en)
  • La Cinta mineraria del Colorado (in lingua inglese: Colorado Mineral Belt, abbreviata in CMB) è un'area di giacimenti minerari che va dalle montagne di La Plata nel Colorado sud-occidentale fino al Boulder, al centro dello Stato. La regione ha prodotto la maggior parte delle ricchezze minerali del Colorado per decenni, dai primi anni del 1800 sino ad oggi. Numerosi prospettori arrivarono da tutte le parti del paese per cercare fortuna nelle montagne del Colorado. Quando i prezzi dei minerali divennero alti, le attività estrattive raggiunsero un boom, creando grandi comunità come Leadville. Successivamente, in seguito al calo dei prezzi o all'esaurimento delle riserve, molte città si depopolarono. Durante questi anni sono stati estratti oro, argento, rame, zinco e molibdeno, per un valore di oltre 5,5 miliardi di dollari. La cintura si trova all'interno di una zona che è stata geologicamente attiva a intervalli, dal momento dell'accrescimento della crosta nel Colorado centrale, avvenuto circa 1,6 miliardi di anni fa, fino ad oggi. Parti della CMB seguono le zone di taglio di età precambriana, paleozoica e mesozoica. Rocce ignee intruse circa 60-70 milioni di anni fa durante l'orogenesi laramide sono associate alla cintura e un tempo si pensava che fossero l'origine della maggior parte dei giacimenti minerari. Un'ipotesi recente, invece, collega i giacimenti più importanti a fenomeni magmatici più recenti, alcuni dei quali sono iniziati 25 milioni di anni di fa. (it)
orogeny
  • Laramide (en)
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