Study of the 1850 and 1893 Ordnance Survey maps reveals two sites labelled Mount Osborn Colliery. The Northern site is next to the Barnsley Canal and the southern site is next to the railway close to what is now Barnsley Football Club's ground at Oakwell. The two sites are 700m apart and not linked at surface by a tramway on any of the maps I have seen. By the 1893 survey, the northern site is not named and its tramway to the canal has gone; the southern site is labelled as disused in 1893.
Does anybody know if the mines were linked underground or if it was a case of two separate mines under a single ownership?
I have made an entry for the southern site as the existing AditNow entry relates to the northern site, and illustrated with a map extract in the Archive Album for the southern site.