You can deed off the mineral right assuming you actually own them to begin with. Are you sure you have title to them? Lots of folks don't realize they do not have a true "fee simple" title to the mineral right.
You can write a simple mineral deed to transfer your mineral rights. Since over-conveyence is possible, I would make sure the deed is vetted first. Secondly, you will have to disclose that the minerals are not transferred in the sale of the house. Same issue with water rights. If you have water rights, they have to be explicitly defined for a proper deed.
Depending upon the size of the parcel, retaining the mineral right comes with it a possible loss in value to the surface property. Two reasons, First, they might want them and think they have "value". Secondly, since the owners would have a loss of control over the mineral rights, they might have some resistence to buying the property. That is especially true if the area is "hot" for exploration and doubly true the smaller the parcel.
If you have a small parcel (20 ac or less, maybe larger), then when you deed off the mineral rights you might be able to deflect that last doubt of a buyer by not retaining the right of engress/egress on the surface. In other words, the land owner can prevent a company from building a well location on the property but they could not stop a horizonally drilled well from penetrating beneath them. Colorado also has some viewscape issues regarding locating a well near a house..