Idrus, A. et al. 2011. Geology and Characteristics of Pb-Zn-Cu-Ag Skarn Deposit at Ruwai, Lamandau Regency, Central Kalimantan. Indonesian Journal on Geoscience. 6, 4 (Dec. 2011), 191–201. DOI:https://doi.org/10.17014/ijog.6.4.191-201.