The Chewelah district in Stevens County produced 1.7 million troy ounces (53 metric tons) of silver and 5,000 metric tons of copper from quartz-carbonate veins. Chalcopyrite is the principal ore mineral. The deposits are hosted in shear zones in argillite of the Precambrian Belt Supergroup.Allen V. Heyl and others, Silver, in United States Mineral Resources, US Geological Survey, Professional Paper 820, p.594-595 Silver-mining stocks were a mainstay of the Spokane Stock Exchange.
