Location: |
Gold-platinum placer. Kalimantan, Indonesia |
Major Minerals: |
Gold-silver alloys, zircon, ilmenite, magnetite, cassiterite, pyrite |
Minor and trace Minerals: |
Include platinum-iron alloys, iridosmine, osmiridium, chromite, cinnabar, marcasite, rutile. |
Textures: |
The gold fineness is related to its colour and reflectance. Gold enrichment rims have lower reflectance and are deeper yellow than the silver-rich cores. Copper-bearing gold-silver alloys are pinker than gold-silver alloys |
References: |
Stumpfl and Clark, 1965; Stumpfl, 1974; Bowles et al., 1984 |