Okay, I'm a lv. 280 Goblin Engineer and 260 Mining. Lately I've been neglecting my Engineering for the sole purpose of gaining money through Mining, but I just can't seem to do it. From lv. 42-45 (45 now) I've been doing nothing with my ores and bars but selling them (or making the odd Deadly Blunderbuss/Deadly Scope). I know Earthen Ring's Auction House prices fluctuate a lot more than other servers I've been on, but this is ridiculous. I make a lot of money one day, and lose my butt the next. I never can anticipate how to sell my bars.
Anyone have any advice for making money with mining? I'm not quite high enough level to get into the zones with Thorium yet ...