Where is Gold in Chalcopyrite and Bornite found?
Native Gold (Au) in Chalcopyrite (CuFeS2) and Bornite (Cu5FeS4)
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Open the appGold in Chalcopyrite and Bornite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Gold in Chalcopyrite and Bornite
Bingham Canyon Mine, Utah, USA
A world-renowned porphyry copper deposit where gold is a significant byproduct, often found in association with chalcopyrite and bornite.
Grasberg Mine, Papua, Indonesia
One of the largest gold and copper mines globally, with gold occurring in association with copper sulfides in a porphyry-skarn system.
Chuquicamata Mine, Antofagasta Region, Chile
A massive porphyry copper deposit where gold is recovered as a byproduct from sulfide ores, including chalcopyrite and bornite.
Olympic Dam, South Australia, Australia
A large polymetallic iron oxide copper-gold (IOCG) deposit where gold is associated with copper sulfides.
Collecting tips
- Look for Copper Sulfides. The primary indicator for this association is the presence of chalcopyrite (brassy yellow) and bornite (iridescent tarnish) in the host rock. Gold will be intimately associated with these minerals.
- Examine Hydrothermal Veins and Alteration Zones. Focus on areas with evidence of hydrothermal alteration, such as quartz veins, sericitization, or potassic alteration, which are common in porphyry and epithermal systems.
- Use a Hand Lens or Microscope. Gold in these associations is often microscopic. A hand lens (10x or 20x) or even a petrographic microscope may be necessary to identify fine gold particles within the sulfide matrix.
- Check for High-Density Minerals. Gold is very dense. If you are panning or concentrating samples, look for heavy, metallic yellow flakes in the concentrate.
- Consult Geological Maps and Reports. Research known porphyry copper, skarn, and epithermal gold deposits in your area of interest. These reports often detail the specific mineral associations.
Quick Check
- Color:
- Metallic yellow (gold), brassy yellow (chalcopyrite), brownish-bronze with iridescent tarnish (bornite).
- Luster:
- Metallic.
- Streak:
- Gold: Golden yellow. Chalcopyrite: Greenish-black. Bornite: Grayish-black.
Explore Gold in Chalcopyrite and Bornite
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