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Utah oil sands
In the United States a large supply of oil sands are found in Eastern Utah. These deposits of bitumen or heavy crude oil have the ability to generate about 12 to 19 billion barrels from a number of prominent sites.〔("About Tar Sands." ) Oil Shale and Tar Sands Programmatic EIS Information Center. The U.S. Department of the Interior, Bureau of Land Management, 19 Nov. 2008. Web. 14 Oct. 2009〕
== History ==
Since the early 1900s the oil sand deposits have been extracted mainly for the use of road pavement. Later, in the 1970s, oil companies began to experiment with the deposits in the hope of using it for their benefit. These experiments ended in the late 1980s when the technologies being used were concluded inefficient and too expensive.〔"(The Utah Tar Sands. )" Oil Sands Recovery Technology. Nevtah Capital Management Corp., 7 July 2008. Web. 12 Oct. 2009〕 Recently, oil companies have again become interested in Utah's oil sands. Now that conventional oil is becoming harder to find, oil sands have become an alternative fuel source.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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