I don't know what it is like crossing back into the US with rocks. But coming to Canada, if you have a clean criminal record and less that 10K CDN cash, just leave your firearms at home and all will be good. It is a long drive from Arkansas. It is not easy to find silver but the area is beautiful. Some world class fishing nearby. People are friendly. If you plan on driving up, I would be happy to meet you for a coffee north of Toronto and then you only have 7 hours to go...