Offer unsolicited

Welcome to the forum: Sounds like mineral leases. Don’t proceed until you learn about the process.
More important than the bonus are the terms and royalty percentage.

Beware of Delivering Lease Without Payment:

Failure of a company to pay a lease bonus is a theme that has been raised in this forum far to often. Below are a few discussions on the topic. It is always best to exchange a lease for a check at the time of the transaction. This may not always be possible because of distance. In such cases it is probably better to have an escrow company or attorney to hold the lease until the consideration is paid.

Sometimes companies file leases without payment of bonuses.

There have been cases were companies take leases but never file them. They return the leases later stating that they were never funded by the company. In the meantime, the mineral owner cannot sign with another company.

It is much easier to prevent the issue than to remedy it after the fact.

Below is a sample of Nightmares: