Description
'Dinas quartzite mine survey of workings. Scale 40ft - 1 inch. Redrawn from original mine owner's plan. Amended and further detail added 12/11/1987 by G. J. Christian, unit two cave research and exploration.' Collected as part of archaeological work at Glyn Neath Gunpowder Works, conducted by Elizabeth Tough and team in the 1980s.
