Carl, r.w.Kennedy has the right idea. Evaluate what the minerals are worth to you long term, your current needs and expectations for your lifestyle, and the emotion of “seller’s remorse.” Know beyond a doubt that the potential buyers are motivated by economic gain and that their only emotion is in the risk to reward potential. In other words, guard against the cost of losing the opportunity of your ownership of the minerals (your opportunity cost in selling them).
If you are in a hot area, there are several ways to realize some additional cash without giving up the long term potential of mineral ownership.