Sampling Considerations
BLEG requires the collection of large samples, generally greater than 2 kg. It is necessary to collect fine sized material – silt to clay - where the fine flakes of gold will reside. Given their shape, these fine flakes of gold don’t act hydro-dynamically like heavy minerals, and will not settle in the same locations in a stream bed. Where possible, attempts should be made to sample flash flood sites (where finer material concentrates) – overbank deposits.
Read more about this topic: Bulk Leach Extractable Gold