A natural resources company with its primary strength in coal, Mitsui Mining is an important member of the Mitsui Group.
Cokes are a major source of earnings.
The company is diversifying into fields such as new materials and environmental businesses. Sumitomo Coal sells imported coal, and generates a significant share of earnings from building materials and machine components. The company is entering new fields such as real estate and retailing. Plans call for the further diversification of operations. A diversified mining organization, Nittetsu Mining generates the largest share of sales from limestone for makers of steel and cement.