If you are looking for in depth geological information, I found a pretty good explanation of VMS on the Geological Survey of Canada website. Keep a dictionary handy, hehe.

What an incredible source of information on VMS discoveries. A little dated, much of the information is based on books and reports from the late 90s to 2004, so there is no mention of McFaulds Lake. I am sure there will need to be an update.

One thing I noted that was very interesting is the importance of VMS - they are pretty rare:

They typically occur as lenses of polymetallic massive sulfide that form at or near the seafloor in submarine volcanic environments, and are classified according to either base metal content, gold content and host-rock lithology. There are close to 350 known VMS deposits in Canada and over 800 known worldwide. Historically, they account for 27% of Canada's Cu production, 49% of its Zn, 20% of its Pb, 40% of its Ag and 3% of its Au.

Again, this does not take into account the ROF. Typical tonnage of ore is 10M tons and higher (figure 8):