I dont see the problem with rimmington. And dont shout with capital letters that you dont wanna mine their cause its certainly the best way for xp. If you use the Mine 1 drop 1 (m1d1) option it gets you the most xp possible. And there are bots there frequently, but certainly not always and i guess it more depends what world you train in. Nevertheless, if you got a nice bot you probably autmine the others due to agressive rates you can set.
Im in fact mining iron in rimmington right now and there is another with me (prob a bot aswell) and i autmine him 3/4 of all rocks. If your lvl 30mining with a bronze pickaxe im convinced you wanna try it somewhere else, but if u got a rune pick with 60mining or so, i dont see the problem mining in rimmington. If thats really a no go, then the dwarven mine is your best bet.