S1:This you have to have 10 mining to mine
S2:This you must have 20 mining to mine.
S3:This you must have 30 mining to mine.
The lower the size the more exp when you tag it. If you get 200 star dust (sd) after it's done (tubbied) there will be a yellow alien. Click on him and he'll give you 50,002gp. He will also give you some runes. There are speacial places for stars to land. Find out on the stars2hunt page.