All these metals are worth AT LEAST the cost of getting it out of the ground. That requires labor, equipment, legalities, logistics, security, etc.
When you research which mining stocks to buy, look up their AISC or All-In Sustaining Costs https://www.gold.org/about-gold/gold-supply/responsible-gold/all-in-costs
Copper probably isn't a bad bet, either.
When you research which mining stocks to buy, look up their AISC or All-In Sustaining Costs https://www.gold.org/about-gold/gold-supply/responsible-gold/all-in-costs
Then you have to refine it, mint it, wholesale it