Spend like an hour researching the most efficient way to sell six thousand metric tons of zinc for its scrap value, then do so. I don't need a bunch of zinc for anything I want to do and money is a generally-useful thing to have.
Zinc is very useful! I wouldn't want to imagine a world without zinc.
Thank goodness we still live in a world of telephones, car batteries, handguns, and many things made of zinc.
Value the mineral and prove ownership, get financing, start a company and sell it by unit wholesale.
Sell it to someone who uses it to galvanize steel, I guess?