What does GRG stand for?

Gravity Recoverable Gold (value estimation)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.
Business, finance, etc.

Other Resources:

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Samples in periodicals archive:

Each sample was then carefully panned to collect the gravity recoverable gold.

Sacre-Coeur Readies For Test Mining Rich Alluvial Zone At Million ...

This sample was also subjected to a gravity recoverable gold test which clearly indicated that the sample did not contain a significant coarse gold component.

Sur American Gold Corporation: High Grade Gold Assays Such As 127g/t, ...