United States - Mining

Rich in a variety of mineral resources, the United States was a world leader in the production of many important mineral commodities, such as aluminum, cement, copper, pig iron, lead, molybdenum, phosphates, potash, salt, sulfur, uranium, and zinc. The leading mineral-producing states were Arizona (copper, sand and gravel, portland cement, molybdenum); California (portland cement, sand and gravel, gold, boron); Michigan (iron ore, portland cement, sand and gravel, magnesium compounds); Georgia (clays, crushed and broken stone, portland and masonry cement, sand and gravel); Florida (phosphate rock, crushed and broken stone, portland cement, sand and gravel); Utah (copper, gold, magnesium metal, sand and gravel); Texas (portland cement, crushed and broken stone, magnesium metal, sand and gravel); and Minnesota (iron ore, construction and industrial sand and gravel, crushed and broken stone). Oklahoma and New Mexico were important for petroleum and natural gas, and Kentucky, West Virginia, and Pennsylvania, for coal. Iron ore supported the nation's most basic nonagricultural industry, iron and steel manufacture; the major domestic sources were in the Lake Superior area, with Minnesota and Michigan leading all other states in iron ore yields.