Valhalla Lost

Where can I find the Ore Elementals or do I have to mine them up?

you can sort of mine them up by igniting the miners crates you find while digging. The ore elementals sometimes pop up then. Or you can go to the forbidden mines and you will find a lot there - roaming around. From the Abbey take the north path towards saranth and turn left at the mountains. Along the south side of the mountain you will find a cave, enter and hope for the best.

i would say forbidden mines but it is quite hard solo it is an einherjar boss area so the mobs there come in packs but if you kite them around some you should be fine if you need help dont be affraid to ask someone in game im sure they will tag along and help you out