تعدين النحاس في الولايات المتحدة - المعرفة
2024year8month1day Alaska is not currently a significant copper producer.. Russian explorers discovered copper on the Kasaan Peninsula of Prince of Wales Island in southeastern Alaska about 1865. Mining began in the period 1895–1900, and continued until shortly after World War I.Copper is present as chalcopyrite, occurring with magnetite, pyrite, garnet,
