Adi Sulaksono Presents Groundbreaking Research on Magmatic Degassing at SGA Meeting 2025

Golden, Colorado – Our geologist Adi Sulaksono took the stage at the prestigious Society for Geology Applied to Mineral Deposits (SGA) Meeting 2025, hosted at The Colorado School of Mines, to present new insights into the magmatic evolution of one of the world’s largest copper-gold deposits: the Grasberg Porphyry Cu-Au Deposit in Papua, Indonesia. His presentation, titled “Igneous Amphibole and Apatite from the Grasberg Porphyry Cu-Au Deposit, Indonesia: Insights into the Magmatic Degassing of Volatiles,” showcased how mineral chemistry can be used to reconstruct volatile behavior and redox evolution within ore-forming magmatic systems. Using EPMA and LA-ICP-MS, he analyzed amphibole and apatite minerals to decipher how chlorine (Cl) and sulfur (S)-bearing fluids separated from magmas during crystallization. Most notably, his results suggest that the mixing of magmas with distinct oxidation states could have generated a large amount of SO2 required to form porphyry deposit. This research provides new constraints on volatile evolution and redox-controlled fluid release in porphyry systems, key processes that govern metal transport and ore deposition. The findings not only enhance understanding of Grasberg’s unique mineralization history but also offer broader implications for exploration models in oxidized arc settings worldwide.