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.
Carajás Mine
The Carajás Mine is the largest iron ore mine in the world. It is located in the municipality of Parauapebas, state of Pará in the Carajás Mountains of Northern Brazil. The mine is operated as an open-pit mine, and is estimated to contain roughly 7.2 billion tons of iron ore, plus gold, manganese, bauxite, copper, and nickel.
The mine is located in the mining concession area of the Carajás National Forest, which "contains known reserves of the order of 18 billion tons with an average grade of 65.4% Fe."