1. Does size matter? Implications for exploration;Crowson,2003
2. Survey of Capacities of Copper Mines, Smelters, Refineries and Copper Wire Rod Plants. Successive editions. International Wrought Copper Council, London, 2000.
3. Tilton, J.E., 2003. Creating wealth and competitiveness in mining. In Mining Engineering, September 2003. Society for Mining, Metallurgy, and Exploration Inc.
4. Innovation, productivity growth, and the survival of the US copper industry;Tilton,1999