New Zealand Gold Prospecting & Metal Detecting Forums Archive

wondering what the best size to classify down to before sluicing i am working on a new highbanker type idea that if it works out could deal with around 100 mm rocks without using a trommel or a pre screen but still be portable i am wondering at what size to start in theory i could screen down to 5mm or less before the sluice box but don't want to loose nuggets this way any suggestions would be helpful