 While the tree had long been known about for its size, the unique status of the Mingo Oak was not recognized until 1931, when John Keadle and Leonard Bradshaw of Williamson took measurements of the tree, and found it to be the largest living white oak in the world. Various estimates place the Mingo Oak's seeding between 1354 and 1361 AD. Using borings from the tree, the Smithsonian Institution determined that the Mingo Oak was the oldest tree of its species. The Island Creek Coal Company, the North East Lumber Company, and the Cole and Crane Real Estate Trust leased 1.5 acres (0.61 ha) encompassing the tree to the West Virginia Game, Fish, and Forestry Commission for it to be managed as a state park for the life of the tree. The commission cleared the surrounding land and made improvements such as seating and picnic accommodations for visitors.
