Magic will also be affected by the planet's unique structure, though we won't completely take magic powers away. Since the atmospheric conditions of Alemar III are different than they are on Earth, Gold is going to get a different result than he would back home. Namely, due to all that extra electromagnetic friction, there's going to be a lot more resistance when trying to manipulate the physical make-up of himself or objects around him. Teleportation and telekinesis will be highly unstable; for instance, if you try to teleport you may not end up where you planned, or it might cause you pain--not to mention the worry of not all of you ending up where you thought you were going (it's the same reason transporter beams won't be used). If you try to move an object telepathically, you'll have little control or precision over it--so a gentle nudge could turn into a hard push, causing more damage than intended.

In the case of healing by magic, Gold would have to be very careful he didn't lose control and cause more damage to the person than good. Small heals like relieving pain should be fine, but if he'll be setting bones or trying to knit wounds, it's going to be as unwieldy as moving rocks without causing more cave-ins. We're also inclined to say that apparition won't work, since this will be about pooling what resources the team collectively has when disaster strikes.

Does that work as an explanation for you? We welcome you to play with things and explore Gold's frustration when he realizes his magic isn't working quite right. A little magic shouldn't hurt anyone, but remember it always comes with a price. :)