A 'dismal' decade for copper discovery - Mining Journal
Anthropological Papers: Prehistoric Copper Mining in Michigan : The Nineteenth-Century Discovery of "Ancient Diggings" in the Keweenaw Peninsula and Isle Royale Volume 99 (Series #99) (Paperback) - Walmart.com
Copper - Wikipedia
bne IntelliNews - bneGREEN: Iran hails discovery of largest copper deposit in Middle East
GreenTech targets VMS copper discovery at Yannery in bid to grow Whundo project - Stockhead