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Alkalic Complexes 

 Iron Hill near Powderhorn, Colorado - Image courtesy USGS

Alkalic complexes in
Colorado's Wet Mountains and the Powderhorn district near Gunnison, Colorado contain carbonatite and a variety of other exotic rock types.  Both complexes contain abundant rare earth elements.

Indeed, Powderhorn (also known as Iron Hill) contains the nation's largest volumetric deposit of rare earths as well as the world's largest titanium deposits.
Map of the Powderhorn Mining District.
Click to enlarge image

View Iron Hill in Google Earth

Find more information about the valuable mineral deposits of Alkalic Complexes in the Colorado Geological Survey Bookstore Resource Series:
Alkalic Igneous Rocks of Colorado and Their Associated Ore Deposits
Last Updated: 10/25/2012 3:27 PM 
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