Quantitative characteristics of volcanogenic massive sulphide deposits

CIM Bulletin, Vol. 73, No. 814, 1980

D.F. SANGSTER, Geological Survey of Canada, Ottawa

Eight volcanogenic massive sulphide districts in Canada and Japan, ranging in age from Archean to Miocene, were selected for analysis. The study revealed that: (1) each district has an average diameter of 32 km; (2) the districts contain 4 to 20 deposits each, with an average of 12 deposits; (3) the average total base metal content per district is 4.6 million tonnes, with a coefficient of variation of 32%; (4) ranked in order of size, the largest deposit in each district contains, on average, 67% of the total metal and the second largest about 13%. The remaining deposits range downward in decreasing proportions. Empirical observations such as these may be used for evaluating the undiscovered potential of new districts as well as contributing to a better understanding of the distribution and genesis of this important class of base metal deposits.
Keywords: Ore deposits, Sulphide deposits, Massive sulphides, Volcanogenic deposits, Hokuroku district, Bathurst district, Flin Flon district, Snow Lake district, Noranda district, Matagami district, Manitouwadge district.