Figure 10 Last RNS26 Sep 2025 13:38
As per the last RNS Figure 10, I asked Chat GPT the follwing.
In gold exploration what is the significance of a drill core containing Massive coarse grained carbonate vein with minor quartz concentrated on the edges of the vein. There is fine grained disseminated pyrite on the surfaces of vugs within the vein
The answer as follows-------
🪨 Your Core Description
Massive, coarse-grained carbonate vein → strong hydrothermal fluid flow channel.
Minor quartz concentrated at vein margins → suggests a multiphase vein history (early quartz, then later carbonate flooding).
Fine-grained disseminated pyrite coating vug surfaces → hydrothermal sulfide deposition inside open-space cavities (vugs).
🔑 Significance in Gold Exploration
Evidence of a Mineralizing Fluid System
The presence of pyrite in vugs is important — vuggy textures mean the vein once held open space for fluid circulation, and precipitation of pyrite shows sulfide saturation.
Sulfide deposition indicates the fluids were capable of carrying and precipitating metals, including gold.
Association With Gold in Orogenic Systems
In many orogenic gold deposits, pyrite (especially fine-grained or arsenian) is the main host of refractory gold.
The fact that it occurs inside the vein rather than just in wall-rock alteration makes this vein more prospective than a barren carbonate fill.
Paragenesis (Timing of Vein Filling)
Quartz on the edges, carbonate in the middle = classic paragenetic sequence:
Early silica-rich fluids deposited quartz along vein margins.
Later carbonate-rich fluids flooded the fracture, filling the rest.
The pyrite in vugs could represent a late-stage sulfide pulse — often coinciding with or just after gold deposition.
Geochemical Implications
Even if visible gold isn’t present, pyrite can trap micron-scale gold.
This style of pyrite is a prime candidate for assay and trace-element analysis (e.g., Au, As, Sb, Hg, Te).
Arsenic-rich pyrite, in particular, is a strong gold pathfinder.
Exploration Vectoring
If this vein is part of a larger vein system, you may be on the periphery of a gold-bearing structure.
Look for:
Increasing quartz content toward the center of the vein system.
More sulfides (arsenopyrite, chalcopyrite, galena, etc.).
Wall-rock alteration halos (ankerite, sericite, silica, chlorite, sulfidation).
✅ Bottom Line
Your described vein is not likely barren.
The combination of:
Quartz at vein edges (early phase)
Carbonate flooding (later sealing event)
Pyrite in vugs (sulfide deposition in open space)
…strongly suggests this vein was part of a hydrothermal system capable of precipitating gold.
It should be:
Assayed for Au (even if nothing is visible).
Checked for pyrite chemistry (As, Sb, Te content can indicate fertility).
Considered in context: does this vein cut through a major shear zone or structure? If so, you may be close to the main mineralized shoot
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