Yes yes Rob ~ Main is a common addition as in Barnsley Main just a 15 mins walk from where I live ~ but WHY Main was my concern, cannot find an explantion as to why some had Main and others not, I suggest it was the parent/original/first/main shaft sunk and which could well have access by the cage/pit head to the coal workings ~ many pits also had underground access to other pits

Grimethorpe and Ferrymore I believe were close to each other and North Gawber and Woolley were also

By why some Main and others not?

Ray