You don't say what level you are. So far, with my level 31 pally, I have found Stonetalon Mountains to be the best I've been to for a fair amount of tin veins, which - as has been said above - occasionally spawn as silver. I saw a mithril vein there once also, but my pally is herb/alch so I couldn't even try to mine it. I have not yet, at my level, seen "abundant silver veins."
I notice these veins because my alt is mining/bs. That alt is a lvl 21 warrior and I was able to get into SM with him without much trouble, but there are areas there that would be a problem if you wander far off the road at that level. Still, I do mine tin, silver, and iron with him there that's close to the road.
If you do go into SM, and you go in through the talondeep path (?), you will need to go southwest to clear that area and then head north when you hit the road to get to Stonetalon Peak where you can grab a FP. Good luck.
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"the people can always be brought to the bidding of the leaders. That is easy. All you have to do is tell them they are being attacked and denounce the pacifists for lack of patriotism and exposing the country to danger. It works the same way in any country."
Hermann Goering, April 1946.