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My level 32 Hunter is at 118 Mining (or somewhere around there) and everything is grey except for Silver, which is green. I've never been a Miner before, but from what I get, Silver is a rarer deposit.
How am I supposed to get my mining up? The only thing that gives levels is green and a rarer spawn.
Don't worry about it. The only thing that mining level affects is the ability to mine higher level nodes. You can level up on just mining even if you never smelt; you will just naturally level up on the nodes in your current area to tackle the next one. The only way you could be unable to mine is if you used mining infrequently and progressed to the next level of difficulty before you were ready. If you mine a lot, this won't happen.
The ability to smelt the ore should be available about the time you are mining it.
So, if you are saying smelting silver is green (you are a fairly accomplished silver smelter) and you are only seeing silver rarely, you can smelt way above the level you currently need to. Mine a bit more, and more smelting will open up.