Charles Ellicott Commentary Deuteronomy 8:9

"a land wherein thou shalt eat bread without scarceness, thou shalt not lack anything in it; a land whose stones are iron, and out of whose hills thou mayest dig copper." — Deuteronomy 8:9 (ASV)

Whose stones are iron, and out of whose hills you may dig brass. —We do not hear of mining operations in Palestine from sacred history. “Brass,” i.e., copper; and so in all passages.