That's what I did for a while, but they're a bit too pricey right now and they move up too slowly. That and my CX took a beating today (stupid housing). If you want to make money, you cannot be buying yesterday's hot news and mining has been hot news for months.
I've been looking at not growing so fast sectors that will soon need to play catch up... which right now is pharmaceuticals, medicals, drugstores.
I bought NBIX and NUVO for very nice pops in the last 2 days, and I'm watching PFE and BMY for the longer plays. CVS is a nice little canary for me there that cannot lose (but isn't going to soar either).
I rarely give this kind of opinion on a public forum before the fact, so don't get used to it. Do some serious due diligence research before you hop in, but the whole pharma/med sector has not been very hot and may be overdue. There are some very nice up and coming plays in it if you do your homework well.