The Long Meg Plaster Company Ltd. was established in 1880, driving an underground drift upon which operations commenced in 1885.
The workforce in this year is recorded as being 12 (all Surface), the name of the mine Long Meg Drift and agent A.K.Busby.
(after the plaster company's deputy chairman William Steuart Trimble) that was delivered to the site on 10 June 1954 and was transferred in 1969 now resides at the Bowes Railway in Tyne and Wear.
Today the mine is in a poor state of repair however much of the site can be viewed from the public footpath that runs along the banks of the River Eden from Little Salkeld to Lacy's Caves.
The rail tracks have not been lifted in many places and the public footpath follows its path with metalwork and sleepers exposed.