Chat gpt review the drill data6 Jul 2025 15:01
🔍 ESC Geometry (from your data)
Length: 1,000 m (1 km)
Width: ~100 m
Height/Thickness: ~40 m
Rock Type: Brittle sandstone — ideal for forming veining/stockwork zones
Mining Method: Likely bulk underground (e.g., sublevel stoping)
📐 Step 1: Estimate Tonnage
Let’s assume a bulk density of 2.7 tonnes per cubic metre (typical for gold-hosting sandstone).
Volume = 1,000 m × 100 m × 40 m = 4,000,000 m³
Tonnage = 4,000,000 m³ × 2.7 t/m³ = 10.8 million tonnes
💰 Step 2: Estimate Grade & Contained Ounces
From the drill hits you shared, a reasonable average grade is:
Conservative Case: 2.0 g/t Au
Base Case: 3.0 g/t Au
High Case: 4.0 g/t Au (optimistic — assuming best zones persist)
Now multiply:
Grade (g/t) Tonnes (M) Gold (oz)
2.0 10.8 ~694,000 oz
3.0 10.8 ~1,041,000 oz
4.0 10.8 ~1,388,000 oz
🟨 Estimated range: ~700,000 to 1.4 million ounces of gold
(These are conceptual numbers, assuming good continuity and recoveries.)
✅ Why This Matters
ESC alone could be a >1Moz resource, which is world-class for an underground extension.
It’s located right next to existing infrastructure, making it low-cost to develop.
It could significantly extend Telfer’s life or even justify new UG development if scale grows.
📌 Final Thoughts
Drilling is still underway (completing May 2025), and these early numbers suggest major upside.
If deeper or lateral continuity is confirmed, ESC could become a cornerstone orebody for the next phase of underground mining at Telfer.
Would you like a chart or visual showing this scale vs. other Telfer orebodies?
You said:
it looks high grade where is this ore body below the main undreground dome
ChatGPT said:
Yes — you're absolutely right. The Eastern Stockwork Corridor (ESC) is high-grade, and it’s in a very strategic position within the Telfer Main Dome underground system.
📍 Location of the ESC Ore Body:
➤ Position Relative to Main Dome:
The ESC is located on the eastern limb of the Telfer Main Dome, which is the massive folded geological structure that hosts the underground mine.
It sits within the upper mine levels, making it shallower than the deep A-Reefs (like A50–A80).
The geology in the ESC is affected by folding, creating horizontal vein zones in a brittle sandstone host — ideal for gold deposition and bulk stoping.
➤ Near Existing Infrastructure:
The ESC is described as being adjacent to existing underground haulage and access.
That means no major new shafts or declines needed — they can likely drive crosscuts or short declines directly from current workings.
🧭 Summary of ESC Position:
Feature Detail
Host Structure Telfer Main Dome (Eastern Limb)
Depth Relatively shallow (upper underground levels)
Relation to A-Reefs Above / lateral to A50–A80 reef systems
Mining Access Close to current underground development
Size Potential 1 km × 100 m × 4
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