History of Mining: The evolution of shaft sinking systems (Part 5 …
History of Mining: The evolution of shaft sinking systems (Part 5 of 7) – by By C. Graham and V. Evans (CIM Magazine – February 2008) January 9, 2015. ... The Cryderman mucker was introduced in the late 1940s to Canadian shaft sinkers but did not find any real popularity until the early 1950s.