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Significats de free milling en anglès

Encara no tenim significats per a "free milling".
Ús de free milling en anglès
1
Gold that is not united with other metals is called " free milling gold."
Diggers in the Earth
2
This was free milling.
Scientific American Supplement, No. 360, November 25, 1882
3
There are, however, some high grade ores in narrow fissures and in a few localities free milling ores and placer deposits are found.
A Review of the Resources and Industries of the State of Washing...
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