Well, I don't have an options account, but I would say buying call options on GDX fairly out of the money would be a nice lotto ticket.
Silver doesn't have an ETF, but I would think buying MVG or any of the producers would be a very nice play. From what I can see, it looks like you have Silverstone already (SVRCF?), a very nice play. I can see Silver plays like First Majestic, CDE, Impact, ECU and Sabina doubling in value within 2 years.
If Gammon gets their litigation ironed out, that could be a huge gold play.
You already have some very good exposure from what I can see.
sp71