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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.
Where are coal mines located?
Coal mines are located underground
Which US state has the most collieries?
There are a total of fifty-two coal mines in the United States. The state with the most collieries is Wyoming which has thirteen coal mines and they are surface mines.
How many underground mines did PA have in 2001?
Pennsylvania (73 underground mines, 58.1 million short tons).
How many underground mines are there in Australia?
There are too many underground mines to list. Australia is very rich in mining resources.
How did they mine salt in the past?
In underground mines, as today in many mines.
Did every mine have a shaft?
No, not every mine had a shaft. Some mines used adits, which are horizontal tunnels dug into the side of a hill or mountain to access the mineral deposits underground. Adits were particularly common in hilly or mountainous regions where it was easier to dig horizontally than vertically.
What is SIC 1222?
includes establishments primarily engaged in producing bituminous coal in underground mines or in developing bituminous coal underground mines.
What US state mines the most copper?
arizona
Where in Britain can you find underground salt?
You can find it in the underground salt mines in England
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.
Where do you find zinc most common in underground or open cut mines?
I researched zinc earlier this year. Zinc is found in ores of some gems so probably most common with open cut mines.
