Chlorination sp will work but yields a low quality GOld, order 67% nitric from amazon and Urea (to nutrilize any unused quantities) both in amazon, use the HCL and i put in a capfull of Chlorine per 600ml of Aqua regia. (helps the reaction) works well ive been yielding 1 oz per 8 lbs of ore,, but i have a sweet vein so ... i dunno... what kind of seperation are you using? and what kind of seperator ie Salt peter will work but SMB (Sodium metabisulfite) can be bought at your local brewery and drops the gold out like a freak in heat! (1 pound is 1.99$) cheap. effective! either way let us know what your working with mineral wise... maybe we can better help you with it , then the Limp jokes will subside! lol