The company that has your mineral interests under lease should be the last thing you worry about in this situation. You signed a contract with them, it will terminate some time this year, they apparently are interested in renewing the lease. If you sell the property, the deed will be recorded and that provides constructive notice to the Lessee. You don't need to do anything else at this point. What to do with the mineral interest is an independent decision from the decision to sell your house and the surface estate. If your property is in an urban or suburban area, your lease may already include a no surface occupancy clause which gives the Lessee the right to pool your lease with others, but not the right to enter on or drill any wells on your property. If your property is urban or suburban and does not include this provision, you should certainly think about it for any future lease. If the property is rural, you can include similar restrictions on drilling within a set distance from any house or structure. These types of restrictions should reduce any fear that a prospective surface only purchaser might have about buying your house.
A decent rule of thumb, for mineral interests in a non-producing area, is that the value of the minerals is roughly equal to 3 times what they would bring in a typical lease bonus transaction. Most people when buying a house aren't willing to pay extra to receive the mineral rights, but they will be more than happy to accept them as part of the deal if they don't have to pay more. If you sell your house and don't get an offer that adequately compensates you for the mineral rights, simply reserve the minerals. If the buyer objects, wait for the next buyer.