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How did they mine salt in the past?
In underground mines, as today in many mines.
How many underground mines did PA have in 2001?
Pennsylvania (73 underground mines, 58.1 million short tons).
What are the attrition rates for underground mines?
In 1998 there were about 860 underground coal mines in operation. By 2001 that number had declined to 719 underground mines.
How many underground mines are there in the U.S.?
In 2001 there were 719 underground coal mines in the United States, which produced 380.6 million metric short tons.
How many underground mines Kentucky have?
As of 2001 Kentucky (264 mines, 80.9 million short tons)
What can be mined underground?
Just about any mineral or metal can be mined underground or at the surface. Some typical underground mines may include gold, silver, coal, uranium, limestone, and salt. Many gemstones such as opal, diamond, emerald, ruby and sapphire are found in underground mines.
Where are coal mines located?
Coal mines are located around the world, with major coal-producing countries including China, the United States, India, Australia, and Indonesia. Specific locations of coal mines can vary widely within each country.
How many gold mines are in australia that are still open?
100,000
How many uranium mines are there?
In the United States, as of 2008, there were 17 sources, and 10 underground mines. http://www.eia.doe.gov/cneaf/nuclear/dupr/umine.html
What is SIC 1222?
includes establishments primarily engaged in producing bituminous coal in underground mines or in developing bituminous coal underground mines.
Is it possible to have a completely underground city?
Easily- many mines have people in them around the clock for years.
What state has the most underground mines?
West Virginia leads the nation in underground coal mining with 193 underground mines that produced 99.6 million metric short tons in 2001.
