yer but for just the average prospector sometimes just crushing it up will tell you if you want to go back and dig up more or its not worth your time or effort if your not getting anymore than say 2 specks of gold for every 4 to 6 kg of quartz crushed it is worth it if you can cyanide treat it and leach it with mercury but handing those chemical's are highly risky and dangerous and I wouldn't do it if I was just the average hobbyist