Mites suck. You can pitch the whole thing sterilize and start fresh, but if you really want to you can control and try to eliminate them and work through to get a pretty good harvest. You have a few options but your best bet if you can keep them under control is to finish up your plants and not let them near any other plants treat them like a biohazard. One thing I suggest you pick up right now is a NO PEST strip and hang it in there, some people swear by these I haven't really tested it's limits yet. I too recieved clones with mite. First I bought Doktor Doom spray to kill the adults and larva but not the eggs, knocked them back but didn't work. I picked up End All and sprayed them for a while again and it worked very well but my plants were too bushy to get every spot. If your plants are small enough make up a batch of this stuff and dip you plants right in there. If they are bigger get to sponges and sandwhich each leaf in the two and wipe it clean, just do your healthiest plant first. It is supposed to kill eggs too. I froze my plants for 4 hours this winter to try and kill them but I just slowed them down, I've sprayed them with water to knock them off, pruned infested leaves, and blown with fans. I just was fortunate enought to start a batch of clones that were mite free and to ever pre cation, in the mean time I took my 7 infest plant through flower and got a pound out of them. There is hope but it is hard work.