dredge,check out Bremang dredge,monster wasn't it!! ant http://www.google.com/url?sa=t&source=web&cd=1&sqi=2&ved=0CCIQxQEwAA&url=http%3A%2F%2Fdocs.google.com%2Fviewer%3Fa%3Dv%26q%3Dcache%3APEwtASvpNO4J%3Awww.sunergygold.com%2Fprojects%2FALLUVIALGOLDMINING.pdf%2Boffin%2Briver%2Bmaps%26hl%3Den%26gl%3Dus%26pid%3Dbl%26srcid%3DADGEESii1sYljkood7ZqhmGHk-iZbVyRZnMf6fj2_JNlCcGVdYHIzhoeBGF0rc8juOS8k4TL6DdL48kOEyObBMe8vzSiNvew_zah-2QO_S0AXfs6k-UqYxrnA1J3eikZCPRtiVNPsP4z%26sig%3DAHIEtbRTkSZJXbqJ2v-inykS38bAd0YHcA&ei=s0tzTunBOePl0QG9w8HJDQ&usg=AFQjCNE1jYtrBrccowBH5rWtQZdKg-wB7Q