20 Mine is located off PA Rt. 981, .3 miles north of Pleasant Unity. It consists, ca.1994 of the machine shop, motor barn, and office. It contains one-story and rests on a concrete foundation. Steel Fink trusses support the roof.
Railroad tracks extend through the north side of the building.
The motor barn is used, ca.1994, as an office and showroom by a firm that sells farm equipment. Serving as a storgae shed, ca.1994, for the farm equipment firm is the former machine shop. The roof is supported by steel scissors trusses. Office Building, Jamison No. Buiding Jamison No.