THIS is the passage I was trying to find earlier today...
"Surely there is a mine for silver, and a place for gold to be refined.
Iron is taken out of the earth, and copper is smelted from ore.
Miners put an end to darkness,
and search out to the farthest bound
the ore in gloom and deep darkness.
They open shafts in a valley away from human habitation;
they are forgotten by travelers,
they sway suspended, remote from people.
As for the earth, out of it comes bread;
but underneath it is turned up as by fire.
Its stones are the place of sapphires,
and its dust contains gold.
That path no bird of prey knows,
and the falcon's eye has not seen it.
The proud wild animals have not trodden it;
the lion has not passed over it.
They put their hand to the flinty rock
and overturn mountains by the roots.
They cut out channels in the rocks,
and their eyes see every precious thing.
The sources of the rivers they probe;
hidden things they bring to light."