Mineral rights value for Medicaid application

New to this realm. My dad owns 15/160 net mineral (15 acres) in Beckham County. Gets royalties from 4 different companies. Was wondering what the value is of the rights. Need to know for Medicaid application reasons.

Description says

E 1/2 SW 1/4 and W 1/2 SE 1/4 of Section 32 Township 12 north range 22 west of the Indian meridan

Pinned location would be nice