Figure 2. Identification of rock types using immobile-element ratios, diamond drillhole DRN-1, Tanah Laut property, Kalimantan. The Zr/TiO2 ratio provides a more informative indicator of rock type than the Al2O3/TiO2 ratio in this terrane, as Al2O3/TiO2 ratios of mafic to dacitic rocks in island-arcs show rather limited variations. The gold occurrences are in the veined and altered dacitic and andesitic rocks.

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