The Watkins Coal Co., probably named after coal baron Thomas H. Watkins, opened the Watkins No. 1, No. 2, and No. 3 mines circa 1910-15. The Upper Freeport, Lower Freeport, and Lower Kittanning coal seams were mined. Later, Pennsylvania Coal & Coke Co. purchased the Watkins mines, and Watkins No. 1 became Pennsylvania No. 18 mine. Finally, that mine ended up being another portal into Barnes and Tucker Company's sprawling Lancashire No. 15 mine, which closed in 1969.
Sources:
Zern, E. N., editor. The Coal Catalog, Combined with Coal Field Directory. Keystone Consolidated Publishing Company, 1920.
http://patheoldminer.rootsweb.ancestry.com (now defunct), by Ray Washlaski. Accessed here through the Wayback Machine.
Barnes-Watkins Refuse Pile Reclamation Project, Pennsylvania Department of Environmental Protection.