There are only two ways that I know of:
-The first one requires a decently-geared tank. Seeing as the Mage won't be able to stealth you'll have to fight your way through, so it'll be longer and harder, especially without any healer. You might be able to just burn down the mobs quickly, but I never tried it myself. Even if it's level 70 content, it's still heroic and stuff hits pretty hard.
-The second one can be done with any level of gear, but you need to be able to stealth to the boss. There's a spot in the room where you can stand and aggro nothing, so you can HoT the DoT statue and let it bring the boss to 5k health, then just finish it off to have the kill credited to you. It takes roughly 40 minutes though. But again, with a non-stealth mage, you can't do that.
So, you'll pretty much have to go with a tank, and maybe you can heal and just run the place normally, except with fewer people. I can't think of any other way duoing with a Mage, sorry.