Please respect other members. Please do not post links or information about hacking/warez/cheats.
Read the rules of these forums as we rarely warn before banning. Lost or need RSS check the forum map.
So get a decent add-on that will help you remember where the nodes are.
Typically though you need to look at the mining skill required to mine those nodes and using the formula of 5 rework that to a level. I'm not 100% sure that this works, but from what I recall it seems to work out.
For example:
Tin is orange at a mining skill of 65, yellow at 90 and green at 115. Divide each of those by 5 and you get 13, 19 and 23. If memory serves me right, you should be looking in zones aimed at a player between level 17 and 22 approximately for mining Tin. (And higher, of course, although other minerals will be more prevalent)
Silver is simply an uncommon tin node, in the same way that gold is an uncommon iron or mithril node. For reference then - Copper is 1, 25 and 47. Tin is 65, 90 and 115. Silver is 75, 100 and 125. Iron is 125, 150 and 175. Gold is 155, 175 and 205. Mithril is 175, 200 and 225.