Hi - my name is XXXXX XXXXX I'm a Business litigation attorney.
You are not liable for the actions of another - - even if it occurs on your property.
Therefore, if your interest is force pooled with the others and mineral, oil, gas, etc. excavation occurs on your property, then the company performing the work is liable to you (as a landowner) and the public in general to perform the operations safely.
If the excavation company is negligent or otherwise causes damage or harm to the property (i.e. - - pollutes the water), then it is the company's fault. In fact, you and the public would have claims against the company for their actions and damage to your property.
The contract SHOULD contain some type of indemnity provision or agreement that says the excavation company will take full responsibility for its activities and will hold you and the other owners harmless and defend you against any claims that stem from activities that they perform.
If there is no such provision in the agreement, you should push for one. Even if there isn't such a provision, you should be able to get protection legally, but it would take filing a lawsuit to obtain the protection. Thus, a simple indemnity provision in a contract is easier and much cheaper.