|Rough diamonds including several fancy diamonds from the Argyle diamond mine, |
Australia. Photo "Copyright © 2014 Rio Tinto."
Diamonds were found in a group of kimberlites along the edge of the Wyoming Craton in 1975 in both Colorado and Wyoming. Several detrital diamonds were found in the Wyoming Province in Montana in the past and more recently diamonds were recovered in a kimberlite in that region. Additionally, kimberlites, lamproites and lamprophyres were found all over the Wyoming Province but these remain a scientific curiosity. Over the next three decades, Wyoming spent essentially nothing compared to the $billions that have been spent in Canada exploring and developing diamond deposits. Yet, hundreds of cryptovolcanic structures of unknown origin remained unexplored and have yet to be drilled in the Wyoming Province. Is the Wyoming Province also a major diamond province? After many years of talking to hundreds of geologists and prospectors about the kimberlites and potential placer diamond deposits, one prospector finally panned one of the many locations suggested by the author and reportedly found a cache of diamonds including one, flawless, 6-carat diamond verified by a university in North Carolina.
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|Cryptovolcanic structure near Douglas Creek in the Medicine Bow Mountains|
of Wyoming. This has been suggested to be an impact structure, but it
is more likely to be a kimberlite pipe.
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|Two excellent quality diamonds found by prospector Paul Boden in 1977.|
These were recovered with gold in a long tom build on Cortez Creek in the
Medicine Bow Mountains not far from the above cryptovolcanic structures
|General map showing diamond mines and diamond anomalies in North America. It should be apparent there is|
considerable potential. Much of the high potential for commercial diamond deposits are areas known as cratons (from
Hausel, 2007, 2008).
|View of the Wyoming craton showing locations of kimberlites|
and related anomalies.
|Another cryptovolcanic structure (circular depression) filled with water and surrounded by calcium-carbonate rich soil.|
The depression sits on granite in Colorado. So, is this a kimberlite, an impact depression, or just a lake?