Second Shaft Sinking. Oct 27, 2012 7:43:30 GMT -5 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by John on Oct 27, 2012 7:43:30 GMT -5 Good article on the second shaft sinking done by the NCB at Calverton, in the Coal News Magazine at the NCM's site.www.ncmonline.org.uk/coal_magazine