Imho, it's not worth it to switch to mining at this point. I've always found mining to be a pain.
What level is your toon? If you work your skinning up to 375, you can start farming the thick clefthoof leather from Nagrand which sells for 60g a stack on my server.... within minutes of putting it on the AH. And again, imo, skinning is much easier than farming so your g/hour spent farming will be much higher.
Disenchanting is also a great money maker, but at this point, you're looking at spending a pretty decent chunk of change to move that up as well.
If all you're concerned with is money making, then I would consider herbalism/skinning. Neither one cost anything to level, and they're both very profitable, at least on my server.