Bolton Gill and Hebden Gill Lead Workings, Hebden. Yorkshire Dales. Archaeological Survey Report

The earliest mining activity within the study area was on the northern side of Bolton Gill, and was characterised by a series of hushes extending down the valley. The date of the
hushes is very uncertain, and from a technological perspective could potentially be of any date within the broad range of the fifteenth to the seventeenth centuries.
Across the northern side of Bolton Gill is a small mining landscape comprising two parallel lines of shafts which were serviced by a dressing floor on the lower, undulating ground. The amount of spoil associated with these shafts was not substantial and the implication is that the shafts were not dug to a great depth and the workings were relatively non-intensive; however, they were collectively sufficiently productive to warrant the establishment of a local dressing floor. There are documentary references to the mine operations of William Ridley in 1759, which provides details of the working of up to four shafts; they are not specifically located but believed to be from this area of Bolton Gill.
Across the area of Bolton Haw Side, there is a series of shafts that pre-date the workings of the Hebden Moor Mining company, and these probably correspond to documented coal
working throughout the eighteenth century.