Job 28:2-6

2Iron is taken out of the earth, And copper is smelted from the stone ore.

3Man puts an end to darkness [by bringing in a light], And to the farthest bounds he searches out The rock buried in gloom and deep shadow.

4He breaks open (mine) shafts far away from where people live, [In places] forgotten by the [human] foot; They dangle [in the mines] and hang away from men.

5[As for] the earth, out of it comes food, But underneath [its surface, down deep] it is turned over as fire.

6Its stones are the bed of sapphires; It holds dust of gold.