Boyd’s Bible Dictionary:
A metal well known to ancients
(Num. 31:22); evidently dross (Isa. 1:25). Imported from Tarshish (Ezek. 27:12).
Concise Bible Dictionary:
Punch Design on Tin Plate
This is the stannum of the ancients, found alloyed with lead, but separated by smelting. It is not known to have been found in Palestine, but would have been early known there and was imported from Tarshish (Num. 31:22; Isa. 1:25; Ezek. 22:18,20; Ezek. 27:12).
Tin Ore