Cefn Arda Pit, Gorseinon, is thought to have reached to the Swansea four-feet vein, and to have been a shaft belonging to Mountain Colliery (Nprn 80621). Dates of operation uncertain.

Strahan, A. Cantrill, T.C., Dixon, E.E.L. & Thomas, H.H., 1909. The geology of the South Wales Coalfield.

RCAHMW, 2009.