Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an orebody, lode, vein, seam, reef or placer deposits.

The health effects of high exposure to radon in mines, where exposures reaching 1,000,000 Bq/m 3 can be found, can be recognized in Paracelsus' 1530 description of a ...

Mining is the extraction of valuable minerals or other geological materials from the earth, usually from an orebody, lode, vein, seam, reef or placer deposits.