Links to mining history stuff in the Bollington area:
http://www.lhi.org.uk/docs/leafllet.pdf
This article mentions the actual tunnel we went in;
Fireclay
Usually mined with coal, seams of fireclay were to be found under Bollington and stretching to Pott Shrigley and Bakestonedale, all part of the wider Poynton coalfield. The coal and the fireclay were usually interleaved with each other so it made considerable economic sense to mine them both, make bricks of the clay and fire them with the coal. This was how it was done at Hammond's brick works at Pott Shrigley.
Just north of Clarence Mill, along the canal a couple of hundred metres, there is a wharf. If you look carefully you will see that the off-side canal edge is formed from large well dressed blocks of stone. This wharf belonged to John Hall & Sons Ltd and served their mine, the drift shaft of which can still be seen, easiest in winter, alongside the field hedge about 150m from the canal. This gently sloping shaft went back under the hill and the output was fireclay. This was loaded onto day boats (those having no living accommodation) at the wharf and, at one time, taken to Dukinfield near Ashton-under-Lyne, to the east of Manchester. So imagine, if you will, the lot of the poor boatman - he would start early in the morning with his horse towing the boat loaded with about 20 tons of clay up the Macclesfield Canal. Almost three hours to Marple then onto the Peak Forest Canal and spend two hours getting down the 16 locks. A couple more hours to Dukinfield, tie up and unload the clay by hand. Turn the boat, head off back up the Peak Forest Canal, two more hours up the Marple flight and back along the Macclesfield to Bollington. A good sixteen hours work; time to knock off! Do it all again in the morning.
Here's the actual web site
http://www.happy-valley.org.uk/histo...extractive.htm