free milling
free milling
[¦frē ‚mil·iŋ] (mining engineering)
A process applied to ores which contain free gold or silver and can be reduced by crushing and amalgamation (by gravity or on blankets), without roasting or other chemical treatment.
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Ore is free milling and is treated on-site by conventional crush-grind-carbon in pulp processing to produce gold-silver dore.
Willow Creek gold is reported to be free milling with greater than 80 percent recovery by gravity alone and recoveries up to 95 percent reported from gravity and flotation processing.
An additional benefit is contamination free milling that results from the lack of component wear.
The 2005 Williamson feasibility study concluded all rock types at the Williamson deposit are free milling.
At Tulkubash (including mostly free milling mineralization), resources are believed to be increased by 56% to 501K ounces from 321K ounces, with the sulphide (refractory) section of the resource also increasing by 25% to 5.
Consultant John Wells, who oversaw the test work, said the Goliath gold samples gave "excellent" recovery which is "indicative of free milling, clean, non-refractory ore.
The ore is free milling, with excellent gold recovery of greater than 94%.
The Challenger ore is free milling and is processed by gravity concentration, followed by a conventional carbon-in-pulp plant.
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