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The business was founded by Clifford Elphick in July 2005. [3]The company acquired Letšeng diamond mine in 2006, and has since found five of the 20 largest known white gem quality diamonds, elevating the mine to the highest dollar-per-carat kimberlite diamond operation in the world.
Shortly thereafter, Diamond M Corp. briefly changed its name to Diamond M-ODECO Drilling Inc. before becoming Diamond Offshore Drilling, Inc. in 1993. [5] In October 1995, the company once again became a public company via an initial public offering, listing on the New York Stock Exchange. [6] In April 1996, the company acquired Arethusa for ...
UK Coal was the United Kingdom's largest coal mining company, producing approximately 8.7 million tonnes of coal annually from deep mines and surface mines, and possessed estimated reserves in excess of 200 million tonnes of coal. [11] The firm was the successor of British Coal, which was privatised in 1997.
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.
Map of oil and gas fields. This list of oil and gas fields of the North Sea contains links to oil and natural gas reservoirs beneath the North Sea.In terms of the oil industry, "North Sea oil" often refers to a larger geographical set, including areas such as the Norwegian Sea and the UK "Atlantic Margin" (west of Shetland) which are not, strictly speaking, part of the North Sea.
Exploration diamond drilling differs from other geological drilling (such as Reverse Circulation (RC) Drilling [3]) in that a solid core is extracted from depth, for examination on the surface. The key technology of the diamond drill is the actual diamond bit itself. [4] It is composed of industrial diamonds set into a soft metallic matrix.
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In the 1960s and 1970s, Longyear began to diversify into other areas beyond traditional mineral exploration drilling. The company began using diamond bits for drilling and sawing concrete in the construction industry. In 1977, Longyear purchased rights to make concrete saws from the Drillistics Company. The firm's Salt Lake City plant began ...