Bulk leach extractable gold
Bulk leach extractable gold (BLEG) is a geochemical sampling and analytical technique used in gold exploration. In comparative studies with fire assay methods, it has been shown to improve the detection of low-level gold in large, representative samples and to reduce analytical variability associated with sample heterogeneity and the nugget effect.
Source: Wikipedia — Bulk leach extractable gold (CC BY-SA 4.0)