I don't know why a tailor would want mining, except as money to sell from the auction house. I personally think anyone who buys more than the occasional stack from the AH is a fool, though, so I don't try to sell it normally.
I've said in the past that the best second profession for tailors is either enchanting (another stand-alone skill) or skinning (which helps support it a little.)
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Also I think every profession buys True Silver, and who gets Silver? Miners, who makes True Silver when its not found? Alchy's. So Tailor/Miners have their purpose.
Silver is the rare form of tin. Truesilver is the rare form of Mithril. Neither is used for anything that I know of outside of smithing and engineering.
Alchemists don't make Truesilver. In all my time in beta, I not once did a transmute for anyone despite advertising for it...not even Arcanite.
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Leatherworkers can -make- Heavy leather out of medium leather, which lets them then sell it in stacks for a nice amount when people want to make silk packs.
Since when? Only combination skill I knew of was leather scraps into light leather.