Dispersion of tailings from the Walton Ba Cu Pb Zn mine site, Nova .
. of 4 Mt barite and. 0.36 Mt of Cu Pb Zn Ag sulphide ore between 1941 and 1978. .. become Canada's largest barite quarry and mine (Boyle, 1972). Production of . present time small scale dispersion occurs by (i) overflow of water from the.