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At the time the sixth-largest diamond ever found in North America, it was described as "almost flawless" and estimated to be worth $250,000. [3] [15] In 1996 the largest diamond found at the mine was discovered. Named the "Colorado Diamond," it was a 28.3-carat (5.66 g) yellow stone and the fifth-largest diamond found in North America.
In 2010, Colorado was the eleventh largest producer. [6] 1999 Leadville The last working mine in the Leadville mining district, the Black Cloud Mine, closed in 1999. [6] 1996 gemstones State Line Kimberlite District The Kelsey Lake Diamond Mine produced quality diamonds up to 26 carats beginning in 1996. [6] 1995 molybdenum: Leadville
The Freedom Diamond, the largest faceted diamond to originate in the U.S., was mined from Northern Colorado in 1997. Now, it's in our nation's capital
Pages in category "Mines in Colorado" The following 13 pages are in this category, out of 13 total. ... Kelsey Lake Diamond Mine; M. Matchless Mine; S. Shenandoah ...
An incident at a former Colorado gold mine that killed a man and trapped a group of tourists for hours underground in 2024 was caused by "operator error," authorities said.
A rescue operation in Colorado on Thursday to bring trapped mining tour visitors out of an underground mine was successful, seven hours after one person died and four others were injured.. Gov ...
The article states that the mine is defunct, and despite this page that says the mine was shut in 2002 due to legal troubles, this article from 2006 says that exports from Colorado to Israel are up 58% due to diamonds from the Kelsey Lake Mine. I'm assuming these haven't just been sitting around for 3 years but I can't find any other info on ...
Now, the company hopes to expand its existing mine at 4301 Pioneer Ave. into previously undisturbed areas of southwestern Pierce County as demand for aggregate rock grows with population increases.