Low to moderate tonnage moderate to high-grade deposits
Significance: A major source of the world's copper, zinc, lead, gold and silver
Examples: Flin Flon, Manitoba (Hudbay)
Hosted: In volcanic terrains (often in clusters)
Mineralization: Massive sulphide mineralization
Structures and shape: Lens-like or tabular underlain by stockwork system
Mining Method: Normally using underground methods
Drill Intersection: Several meters to tens of meters in lengthwith combined grades of copper, zinc and lead in the 4-10% range or higher
Tonnage (Mt): 2.0-15.0 Most that are mined exceed 5 Mt
Grades: Cu% 1.0-2.5
Zn%: 2.0-6.0
Pb%: 2.0-6.0
Au(g/t) 0.5-2.0
Ag (g/t): 15.0-50.0+
Source: Vanessa MacLean Resource world magazine April 2013
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