Sudbury Mining District – History, Geology and Mineralogy
Quartz is a common vein filling in the Sudbury ores but does not often occur in specimen quality crystals. Quartz mostly occurs only as crystals 15mm in size. Silver. Silver occurs in quantity in solid solution, particularly with copper minerals. The copper refineries in the Sudbury District have produced hundreds of millions of troy ounces of silver as a byproduct of electrolytic .