The old company store, Jamison Supply No. 20, is located on PA Rt. 981, at Phillips Street.  It is a stretcher-bond red-brick building with a single story.  It has a gable roof, and a clay tile foundation.  The building has been remodeled and is currently used as a residence.

The mining complex at the Jamison No. 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.  The motor barn is a common-bond red-brick building and measures 152 ft. x 37 ft.  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.  It is also a common-bond red-brick building with one story;  It measures 75 ft. x 30 ft. and contains multi-pane double-hung windows.  The roof is supported by steel scissors trusses.  The office is also a common-bond red-brick building, containing one-and-a-half stories, a gable roof, and twelve-over-twelve-light double-hung sash wondows.  Inserted in concrete is "Jamison Plant #20".

Despite the slump in the coal market after the First World War Jamison' s mine at Pleasant Unity was one of the region's largest coal producers.  In 1921, a year when the coal industry was suffering from the effects of a nationwide economic slump, Jamison No. 20 mine operated 302 days and the 293 men and boys employed there produced nearly 500,000 tons of coal.  Unlike most of the other Jamison coal properties in Westmoreland County which were leased in 1922 to the Keystone Coal & Coke Company, the Jamison No. 20.

In 1919 Jamison No. 20 Mine produced 141,350 tons of coal, it worked 302 days, with 130 employees.  There was one fatal accident and 1 non-fatal accident in 1919.

During the 1920's Jamison's miners used three electric machines for mining the coal and nine electric locomotives for hauling the coal from the mine. About 240 persons were employed each year at the mine and production was consistently between 400,000 and 500,000 tons of coal per annum.  Jamison No. 20 Mine maintained these produced levels even during the depression of the 1930's.  By 1940 the mine employed 300 miners, and was equipped with seventeen trolley locomotives, Jamsion continued operations at the Pleasant Unity plant until the early 1960's, when it closed the Jamison No. 20 Mine.

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