The Torah promises [successful] copper mining in Israel's mountains:
אֶרֶץ אֲשֶׁר ... וּמֵהֲרָרֶיהָ תַּחְצֹב נְחֹשֶׁת׃
a land ... from whose hills you can mine copper. (Deut 8.9)
I tried to Google, but the only evidence I've found was Solomon's Mines in Timna (c.900 BC), which seems to be outside the borders of Eretz Israel.
Are there additional copper mines within the borders of the Promised Land the Torah talks about that were known from the times of the conquest (c.1500 BC)?
The real question here is not about mining, it's about whether the Torah's promises should be understood literally or metaphorically (like most of my questions probably). Once we reject the fact that it is an existing phenomenon we need to seek a metaphorical explanation.