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The mine produces copper and molybdenum concentrate as well as SX/EW copper cathode from a ROM oxide-leaching system. [1] Sierrita was acquired by Duval Corporation in 1959; Pennzoil acquired a controlling interest in Duval in 1968. [2] Sierrita was operated by Cyprus Mines (later Cyprus Amax Minerals) from 1986 to 1999.
In Arizona, copper mining has been a major industry since the 19th century. In 2007, Arizona was the leading copper-producing state in the country, producing 750 thousand metric tons of copper, valued at $5.54 billion. Arizona's copper production was 60% of the total for the United States. Copper mining also produces gold and silver as ...
Amongst the collection of tools, the Rushmore Drilling Index and Rushmore Drilling Index & Estimated Drilling Days, both designed and owned by the company, are particularly noteworthy. Designed as objective tools for well planning, they index the difficulty and indicate the amount of time a planned well is likely to take to drill to target depth.
Well logging, also known as borehole logging is the practice of making a detailed record (a well log) of the geologic formations penetrated by a borehole.The log may be based either on visual inspection of samples brought to the surface (geological logs) or on physical measurements made by instruments lowered into the hole (geophysical logs).
Your computer's search history is like a diary of your life. If you don't delete it regularly, you might be exposing more sensitive data than you think. So it's a good idea to clear your browsing ...
The earliest record of well drilling dates from 347 AD in China. [1] Petroleum was used in ancient China for "lighting, as a lubricant for cart axles and the bearings of water-powered drop hammers, as a source of carbon for inksticks, and as a medical remedy for sores on humans and mange in animals."
Type this To get this What it searches for {{subst:google}} doc: Pages with the phrase "Google", because the name of this page that you are reading is "Template:Google" ...
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