Where I live they would have the right to buy your land at market rate plus ~25% before they were allowed to mine the area. They could apply for the right to prospect on land you own but have to pay for any significant impact on your ongoing use of the land.

I’d not worry so much about getting a bad deal. Sentimental value in a home on the other hand is something you could not get back.

Consult someone familiar with the law where you live for information that is actually accurate for you.