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Illustration showing drill core. 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]
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In 1992, Diamond M Corporation acquired ODECO from Murphy Oil for $358 million. [4] 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 ...
In 1888, Edmund J. Longyear, a mining engineer from the first graduating class at the Michigan Mining School, drilled the first diamond core hole in the Mesabi Iron Range in northern Minnesota. [1] In 1890, he formed a contract diamond drilling company to serve the rapidly growing U.S. iron ore mining and steel industry.
Rock core samples, the product of a diamond rig. A pied butcherbird perches nearby. A core sample is a cylindrical section of (usually) a naturally-occurring substance. Most core samples are obtained by drilling with special drills into the substance, such as sediment or rock, with a hollow steel tube, called a core drill. The hole made for the ...
The most widely used definition was developed in 1964 by D. U. Deere. It is the borehole core recovery percentage incorporating only pieces of solid core that are longer than 100 mm in length measured along the centerline of the core. In this respect pieces of core that are not hard and sound should not be counted though they are 100 mm in length.
The exploration diamond drilling process was led by Edmund J. Longyear, who went on to drill 7,100 test pits all across the Mesabi Range. In 1976 the Iron Range Historical Society developed the site as a historic attraction with period drilling equipment. It is now managed by the city of Hoyt Lakes in partnership with the Hoyt Lakes Garden Club.
Two which are located in the Norwegian Sea (PL 1009 B and PL 1064) in Warka and Slagugle, one in the North Sea (PL 917 B) for two discoveries in Busta Voe and Cape Enniberg, and the other is the Hasselbaink prospect, where drilling has already begun. [42] In May 2020, the company sold its assets in Northern Australia to Santos Limited for $1.39 ...