It leads into the south end of the side passage off the Masson Cavern show cave, as described in the article published in Bulletin of the Peak District Mines Historical Society, vol.8,no.2,pp.103-108. Autumn 1981. A SURVEY OF THE MASSON CAVE-CUM - MINE COMPLEX, MATLOCK (including Great Masson Cavern, Carding's Nestus, High Loft, Crichman and Gentlewomen's Mines) by Roger Flindall, John Swain and Andrew Hayes.
A large side passage westwards off the show cave route brings one directly to shaft (still open on the surface) which was used recently when working this title (under the incorrect name of Black Ox Mine) for fluorspar. The fluorspar workings include a spacious passage ranging southwards for 60 m through two chambers after which a crawl in old lead workings continues to the base of a 21 m deep shaft (now capped) just inside the Heights of Abraham grounds.