Black Stone Minerals, L.P. is an owner of oil and natural gas mineral interests in the United States. The Company's principal business is maximizing the value of its existing portfolio of mineral and royalty assets through active management and expanding its asset base through acquisitions of additional mineral and royalty interests. As of December 31, 2016, it owned mineral interests in approximately 15.5 million acres, with an average 45.7% ownership interest in that acreage. As of December 31, 2016, it also owned nonparticipating royalty interests in 1.5 million acres and overriding royalty interests in 1.5 million acres. As of December 31, 2016, these non-cost-bearing interests, which it referred to collectively as its mineral and royalty interests, included ownership in 50,000 producing wells. As of December 31, 2016, its mineral and royalty interests were located in 41 states and in 64 onshore basins in the continental United States.