References
- Rowland MG. 2001. Geology of the Spence porphyry copper deposit, northern Chile, Rio Algom internal report.
- Rowland MG, Clark AH. 2001. Temporal overlap of supergene alteration and high-sulfidation mineralization in the Spence porphyry copper deposit, II region, Chile, Abstract, Annual Meeting, Geological Society of America, Session 150.
- Sillitoe RH. 2011. Comments on the Cerro Colorado and Spence hypogene models, northern Chile, BHP Billiton internal report.