Skinning has quite a few advantages, for example, to get maximum of profit by skinning mobs, you don’t need to invest in a fast mount, and if you have powerful AoE, you can really enhance it. A very nice strategy, which I think it’s the best Cataclysm gold farming for skinners at the moment, is to go to Tol Barad, at the marsh with crocolisks for a skinning session there. You won’t even have to kill any because many players do their Tol Barad dailies and you’ll have plenty of corpses to skin. 
Always try to gather and kill at least 3-4 mobs in the same spot. This way you will save time on your skinning. If you’re planning to roll a skinner and you play Alliance, make sure you choose the Worgen race. They have double skinning speed, due to their sharp claws, apparently. Instance skinning is the best because you can gather much more mobs in one pull, without the aggro to reset. Once they’re all dead, you’ll have a big pile of corpses to skin at the same spot. An excellent instance for Rugged Leather is Dire Maul.
Since the juice of the game has moved into the new zones of Cataclysm -Mt.Hyjal, Vashj’ir, Deepholm, Uldum andTwilightHighlands- the resources that can be gathered here are usually low priced, because many players gather them and sell them. This stands for minerals as well. So, as a miner, it’s best to look nowadays at the prices of minerals at intermediate level, like Adamantite or Fel Iron. Prices for these have gone through the roof lately.
Always check the prices for ore and for the bars made from that particular ore, before auctioning them. Sometimes the prices for bars are much higher and you’ll increase your profits. If you always have jewelcrafting along with your mining, check the prices of the gems that can be obtained from the mineral ore that you gather. Sometimes the gems are much more expensive and prospecting the minerals to sell the gems will be more profitable. As a miner, you need a fast mount to be effective. So, the first and most important investment for you must be the Artisan flying skill.
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