Note that your reference using USGS is only a database and all the information is from other sources. The USGS has not mapped this area and probably never will as it is not part of the US.
Some of the best volcanogenic massive sulphide deposits with gold are through ON and QC associated with the Abitibi Greenstone Belt, which is dominantly mafic in composition. A great example is Val d'Or.. or Valley of Gold.
That being said, the information I have read is very interesting. And this part of the province has the correct geologic terrane since it once represented ocean floor. VMS deposits are formed through subaqueous volcanic eruptions; think black smokers you may have seen on TV. NL is an excellent example of a Wilson cycle, which records the opening and closing of an ocean basin. In this case the Avalon Pennisula was part of Europe and the West Coast part of NA and the middle was ocean floor that got sandwiched. Excellent place to find economically viable deposits!