Right now I'm power mining too. I use rimmington mines where there are 2 rocks. ALL you need is 2 rocks unless you have a good Internet connection unlike me. What you do is mine one, drop, mine one and drop then repeat. Also try to leave the bottom 2 rows empty like so I I I I I I I I I I I I I I I I O I I I OOOO O= room for ores I=item of your choice. I usually put saphs as you get more gems and they weigh nothing. If you have a good Internet connection, try alkarid mines. Near the top there are 3 rocks usually having at least 1 person in it. That why you need a good Internet connection, to out mine them. Just try to repeat above but have all empty spaces in your inventory. I'd mine, mine, mine then drop as many as you can before the rocks come back.