I have spent hours this winter running black sand thru my blue desert fox concentrattor- seems to work quite well although I make sure that some black sand goes intothe collector cup so that only a minimal amount of gold is lost. then painstakingly pan the remainder out. Altough i found out that muriatic acid will disolve the black sand away - waiting for a warm day to do it outside!
Any body use muriatic acid before?
Peter
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