1854-1857 Ommaney & Co. 1858-1867 Thrybergh Hall Coal Co. 1868-1872 Messrs Charlesworth 1873-1900.

Managing partner from 1861-1864 was Hiram Williams, a man with an interesting mining history from Swansea to Borneo, then back to England - https://www.researchgate.net/publication/332921173_Native_talent_-_a_Williams_family_of_early_Victorian_Swansea (Page 7, Author Martin Laverty)

There were six fatalities in 1863 when “The chair in which a party of miners were descending the shaft suddenly turned on one end. and the men were precipitated a depth of 150 yards, their bodies being dreadfully mutilated”