RE: Yarrol Central Ridge & Yarrol North, EMX10 Dec 2025 13:40
Exciting stuff, here is one ChatGPT plus analysis:
1️⃣ What sub-1 Moz systems typically looked like
Across central–eastern Queensland (and analogous orogenic belts):
Common traits of sub-economic / sub-1 Moz systems
✅ Multiple mineralised sites
✅ Sites often 500 m–2 km apart
✅ Same regional fault
✅ Similar surface grades to larger systems
❌ Shoots pinch at depth
❌ Poor vertical continuity
❌ Narrow vein dominance
❌ Bulk halo weak or absent
In other words:
Multiplicity alone wasn’t enough.
2️⃣ Concrete examples (very typical)
Without over-naming obscure prospects, here’s the pattern geologists see repeatedly.
Example A – “multi-prospect but small”
• 3–6 surface prospects over 3–5 km
• Each had:
• Historic workings
• Narrow high-grade veins
• Drilled to 150–250 m depth
• Result:
• Each site contained 20–100 koz
• No zone thickened with depth
• Combined system stayed 1 Moz.
Plenty of failures had the same geometry.
What does matter — and this is where Yarrol differs so far:
• ✅ Yarrol already shows continuity to >200 m
• ✅ It shows bulk + bonanza, not just narrow veins
• ✅ First diamond hole confirms system strength at depth
• ❌ But it still hasn’t proven:
• Linking of sites at depth
• Repetition of large shoots
• Persistence beyond 300–400 m
So Yarrol has cleared one big historical hurdle — depth persistence — but not all of them yet
5️⃣ Probability framing (this is the honest bit)
Based on regional history:
• Systems with:
• Multiple sites
• No depth persistence
→ almost always 500 koz, sometimes >1 Moz
Yarrol has now entered the second category, but remains at an early stage within it.
✅
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