Jefferson and Clearfield Coal & Iron Company, a subsidiary of Rochester and Pittsburgh Coal Company, opened the Ernest No. 1 coal mine in 1902, and the first coal was shipped in 1903. By 1907, 274 beehive coke ovens had been constructed next to the tipple. Eventually, mines numbered 2, 3, and 4 were opened. The Ernest mines produced Freeport seam coal until 1965.
There is also a Protestant church in Ernest, but there was not really a parking place where I could stop and photograph it.
Sources:
Rose, Kenneth, editor. Indiana County, Pennsylvania; An Inventory of Historic Engineering and Industrial Sites. 1993.
http://patheoldminer.rootsweb.ancestry.com (now defunct) by Ray Washlaski. Accessed here through the Wayback Machine.
Pennsylvania Mine Map Atlas, 10 Apr. 2021, www.minemaps.psu.edu/.