Black Stone Minerals, L.P. is an owner and manager of oil and natural gas mineral interests in the United States. The Company's principal business is maximizing the value of its existing mineral and royalty assets through active management and expanding its asset base through acquisitions of additional mineral and royalty interests. It owns mineral interests in approximately 16.8 million gross acres. It also owns nonparticipating royalty interests (NPRIs) in 1.8 million gross acres and overriding royalty interests (ORRIs) in 1.6 million gross acres. The Company owns mineral and royalty interests in 41 states in the continental United States, including all of the onshore producing basins. Many of these interests are in active resource plays, including the Haynesville/Bossier shales in East Texas/Western Louisiana, the Wolfcamp/Spraberry/Bone Springs in the Permian Basin, the Bakken/Three Forks in the Williston Basin, and the Eagle Ford shale in South Texas.