add zinc mines and industry

Having zinc as a raw material allows increasing the choice of products and their respective combinations
zinc + steel = galvanized steel
automotive industry
zinc + air = zinc oxide
medical industry
zinc + carbon/copper = batteries
and other.
the process to obtain pure zinc from zinc ores can be:
roaster:
mineral zinc = zinc sulfide
mineral zinc + air = zinc calcine + sulfur dioxide (gas) (no fuel needed)
sulfur dioxide (gas) + water = sulfuric acid
Leaching Tanks
zinc calcine + sulfuric acid = zinc sulfate + sewage sludge (slag)
Electrolysis
Zinc Sulfate + energy = Pure Zinc
Congratulations for the great game you have raised