Kongsberg Silver Mines
The silver mines of Kongsberg, in Buskerud county in Norway, constitute the largest mining field in Norway, with over 80 different mines. It was the largest pre-industrial working place in Norway, with over 4,000 workers at its peak in the 1770s and supplied over 10% of the gross national product of the Danish–Norwegian union during its 335-year-long history: over 450,000 man-years were expended in the production.
Aurora mine
The Aurora mine is the largest integrated phosphate mining and chemical plant in the world. The mine is located in Richland Township, in Aurora in Beaufort County, North Carolina. The mine which is owned since 1995 by PotashCorp, the world's largest potash producer and the second and third largest producer of nitrogen and phosphate, has an annual production capacity of over six million tonnes of phosphate ore. In 2008 the mine produced 6.6 million tonnes of phosphate ore from which 1.3 million tonnes of phosphoric acid was produced.