I guess I'd like the prospector to get reasonably compensated for the services, but think indefinite exclusive rights to be passed on for untold generations is

I guess I'd like the prospector to get reasonably compensated for the services, but think indefinite exclusive rights to be passed on for untold generations is excessive, and thus rent. In the case of he farmer the cost/value calculation is probably such that a 10-20 year contract would be enough for the investment to pay off. So it seems I'm arguing that perpetua, inheritable, property rights can be excessive, and thus create rent