'Ore' in the Bible

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

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

“I [the Lord] have set you as an assayer [O Jeremiah] and as a tester [of the ore] of My people,That you may know and analyze their acts.”

They are all the worst [kind] of [stiff-necked, godless] rebels,Going around spreading slander.They are [not gold and silver ore, but] bronze and iron;They are all corrupt.