 Following the discovery of hydrothermal vents, deposits similar to those of oceanic vents and fossilized vent life forms have been found in some SedEx deposits, which leads to a potential degree of overlap between Sedex and Volcanogenic massive sulfide ore deposits.The Sullivan Pb-Zn Mine in British Columbia was worked for 105 years and produced 16,000,000 tonnes of lead and zinc, as well as 9,000 tonnes of silver.It was Canada's longest lived continuous mining operation and produced metals worth over $20 billion in terms of 2005 metal prices.