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There are a limited number of commercially available diamond mines currently operating in the world, with the 50 largest mines accounting for approximately 90% of global supply. [1] Diamonds are also mined alluvially over disperse areas, where diamonds have been eroded out of the ground, deposited, and concentrated by water or weather action.
World's only perfect diamond found here. [citation needed] Kelsey Lake Diamond Mine: Colorado: State Line Kimberlite District McKenzie Bay: 1976–2001 The United States' first modern diamond mine. Jastro Winkle Alluvial Diamond Field: California: California: Unknown–present
In October 2018, a yellow diamond of 552 carat was found at the mine. This is the largest diamond ever found in North America. [12] On January 23, 2024, a Northwestern Air charter flight carrying workers to the mine crashed shortly after takeoff from Fort Smith Airport, killing six people and injuring one. [13] [14]
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. The gem was cut and polished by legendary New York diamond cutter Bill Goldberg which yielded a 5.39-carat (1.078 g) faceted stone that sold for $87,500. [5] [16]
Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however.
For the first 60 years of the 20th century, diamonds originated from kimberlite pipes and alluvial deposits in places such as Africa and some from South America. Later, diamond discoveries were made in the Soviet Union (now Russia). [2] Since the 1990s, major diamond discoveries were made and mining operations began.
Unearthing pink diamonds. Most diamond deposits are found in the middle of ancient continents — within volcanic rocks that have rapidly transported diamonds from deep inside Earth’s interior ...
The most prominent lamproite diamond source is the Argyle diamond mine in Australia. It is notable that the physical characteristics of Australian lamproite and the Arkansas deposit differ markedly. From the discovery in 1906 into the 1960s, the historical record shows that geologists consistently classified the Arkansas deposit as Kimberlite.