Job 28:1-2

All metals were precious when Job lived. Men seemed to make metals from ordinary rocks. But the process needed great skill. The workmen had to search for the right rocks. Then they would burn the rocks in the hottest fire. In the end, they would produce a tiny quantity of pure metal.

v3 A man carries his torch into the darkest places. He searches everywhere.

He looks for valuable rocks in the deepest darkness.

v4 He goes away from the town. He goes to places that other people have forgotten.

There, he bores through the rock. He descends into a deep cave. There, he hangs and swings round.