Hey edstime- Welcome to the board.
In regard to your question, the historical silver:gold ratio for WEM is indeed 14:1. That's an average, though, and individual deposits will vary. You're also right that the smelting process being used won't retrieve all of the silver- probably not the silver oxide (which would predominate after weathering) and maybe not the silver sulfide. So that may have to be stored and dealt with separately. It involves more chemicals than simple melting, so SFMI may not do it themselves. So the metals reported in the PR won't include most of the silver. That will be a bonus at some point.