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The Gravity-Borax Method GBM is still unknown to most Artisanal and small-scale gold miners (ASGMs) worldwide as most still use mercury to extract gold. "Whole-ore amalgamation" is a technique that requires the use of 10–25 g of mercury to produce 1 g of gold.

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GRG has been defined as the gold content of an ore that can be recovered by gravity into a very small mass, typically less than one per cent (Laplante, Woodcock and Huang, 2001).

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