There are 7 million salt mines.
Open cast mines, coal mines, silver mines, land mines.
364
very deep
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
The reason is that many mines have sunk under water and there is gold in mines so that is why .
It is unknown how many actual gold mines there are or where. There where many gold mines during the gold rush and after.
To work in the mines
234billoin mines are in the world
mines have one shaft
Many mines of many kinds, producing many things, are located in the USA.
In underground mines, as today in many mines.
There were many types of mines used in World War Two. Magnetic mines were some of them.
many mines closed because the cost of operating them had become too high
Four (4)what is thye lotcation of the four mines
King Solomon's Mines has 320 pages.
There are too many underground mines to list. Australia is very rich in mining resources.