free-milling gold

free-milling gold

[′frē ‚mil·iŋ ′gōld]
(metallurgy)
Gold that has a clean surface so that it readily amalgamates with mercury (by gravity or on blankets) after liberation by comminution.
References in periodicals archive ?
The good news about Prestea ores, which will be treated over the next 5 to 6 years, is that its coarse, free-milling gold has less arsenopyrite content.
The percentage of recovery was over 95% (w/w), which complies with the recovery rate expected for a free-milling gold ore (see figure 1).
Gold is associated with sphalerite and pyrite, and is typically identified visually as free-milling gold within quartz or at the margins of sulfide crystals.
The M1 South underground will kick-off WAFs mining development at Sanbrado, with the underground development accessing high-grade, free-milling gold mineralisation located directly beneath the proposed M1 South open pit at approximately 120m vertical.