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.
Based on the results from this preliminary testwork, the material may be tentatively classified as free milling.
The ore is free milling, with excellent gold recovery of greater than 94%.
Historical data indicates that the mine was initially developed in 1908 and yielded free milling gold ore grading as high as 2.
The Challenger ore is free milling and is processed by gravity concentration, followed by a conventional carbon-in-pulp plant.
This extended mine plan would see the Yellowknife operations gradually convert over to a fully refractory operation as free milling reserves at the Con Mine are depleted.
The vein contains free milling gold and gold-enriched copper mineralization.
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