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Deep beneath the BHH kimberlite field lies a 2.0 to 2.4 billion year old Precambrian craton called the Buffalo Head terrane, which has no exposure at surface.The Precambrian craton is overlain by about 1,600 m (5,200 ft) of Paleozoic and Mesozoic sedimentary rocks, which are covered by as much as 200 m (660 ft) of unconsolidated glacial and post-glacial sediments of Quaternary age.
The North American craton is the bedrock forming the heart of the North American continent, and the Canadian Shield is the largest exposed part of the craton's bedrock. The Canadian Shield is part of an ancient continent called Arctica, which was formed about 2.5 Ga during the Neoarchean era.
The Canadian Shield, Precambrian shield, makes up the bedrock geology highlighted by rocks and lakes [2] and a boreal forest area. There are transitional areas between boreal and tundra flora. [3] The lower boundary of the Canadian Shield cuts across the province diagonally from the latitude 57 degrees in the northwest to 54 degrees in the ...
The Nooitgedacht Glacial Pavements comprise a geological feature between Kimberley and Barkly West, South Africa, pertaining to the Palaeozoic-age Dwyka Ice Age, or Karoo Ice Age, (some 300 million years ago) where the glacially scoured (smoothed and striated) ancient bedrock (re-exposed by erosion) was used, substantially more recently, during the Later Stone Age period in the late Holocene ...
A. ^ Harry Winston Diamond Mines owns 40% and Diavik Diamond Mines, which is 100% owned by the Rio Tinto, owns 60%. B. ^ Dominion Diamond Corporation owns 88.9% while Charles Fipke and Stewart Blusson each own 10%. C. ^ Mountain Province Diamonds owns 44%, De Beers Canada 51% and Camphor Ventures 4.9% D. ^ Pine Point and Port Radium are ghost ...
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]
The Perris Block south of the Perris Plain and San Jacinto Basin is characterized by the extension of the Perris Plain, the Plains of Leon that includes within it the Domenigoni Valley and western Diamond Valley, the upper part of the valley of Warm Springs Creek and connecting tablelands, French Valley, Auld Valley and Buck Mesa. [6]
Crater of Diamonds State Park is a 911-acre (369 ha) Arkansas state park in Pike County, Arkansas, in the United States.The park features a 37.5-acre (15.2-hectare) plowed field, one of the few diamond-bearing sites accessible to the public.