I made mine about 35 years ago but I cant remember the brand it was , but I ended up giving it to a club member of mine when I couldn't get out anymore. But I have 2 battery powered blower ( E-GO 450 & 550 CFM) that I've been thinking about one of them....Trouble with them is that they only run (like gangbuster's) for about a hour wide open . A wired blower like Goodygu posted is a real good one to start with. Just remember to add your own filter over the fan blade to slow down it's eventual destruction for the fine rocky dust your sucking up ! And inspect (look for small cracks in the blade) your fan blade BEFORE you leave to go prospecting ! Good luck & have fun !