References
1 Gold Mines in Japan, The Mining & Materials Processing Institute of Japan, 1990.
2 Sumitomo Metal Mining Co. Ltd. (Editorial Committee), Oct. 2003. The Konomai Mine History 50th Anniversary - The History of Sumitomo Konomai Gold Mine, p. 59 – 73.
3 Metals Mining Agency Japan (MMAJ), 1990. Nippon Mining Corp (NMC) Survey Report 3, p. 58-64 & 76-79.
4 Metals Mining Agency Japan (MMAJ), 1995. Survey Report 1995, No. 7 - Geological Structure of the Northern Hokkaido Region B. p. 6-24.