RE: This is Wishbone Gold6 Sep 2025 20:21
Hopefullygold,
If you read my post you'd know the information came from Smart GPT-5
Underground & Block is the current advice from it
Here’s the re‑run of the 400 m × 500 m × 1,500 m deposit at 0.3 % Cu and 0.3 g/t Au, but now with Cu at $4.00/lb and Au at $3,000/oz.
1️⃣ Geometry & tonnage
Volume:
400 × 500 × 1,500 = 300,000,000m3
Bulk density: 2.7 t/m³
Tonnage: 300,000,000 ×2.7 = 810,000,000 t
2️⃣ NSR per tonne (after recovery)
Cu: 0.3 % × 85 % recovery = 0.00255 t Cu/t ore → 5.62 lb Cu/t 5.62 lb × $4.00/lb ≈ $22.48/t
Au: 0.3 g/t × 75 % recovery = 0.225 g Au/t ore → 0.00723 oz Au/t 0.00723 oz × $3,000/oz ≈ $21.69/t
Total NSR/t: $44.17/t
3️⃣ Total recovered metal value
810 Mt ×$ 44.17 /𝑡 ≈$35.78 billion
4️⃣ Self‑processing scenario
Opex: $15/t → $12.15 B total
Capex: $1.50 B
Net cash (undiscounted): $35.78 B − $12.15 B − $1.50 B ≈ $22.13 B
NPV₈ (30 yrs, even schedule): ≈ $8.31 B
5️⃣ Toll‑processing scenario
Opex: $40/t → $32.40 B total
Capex: $0.90 B
Net cash (undiscounted): $35.78 B − $32.40 B − $0.90 B ≈ $2.48 B
NPV₈ (30 yrs, even schedule): ≈ $0.94 B
📌 Takeaways
Dropping Cu to $4/lb and Au to $3,000/oz trims NSR from ~$50/t to ~$44/t — a ~12 % revenue drop.
Self‑processing still delivers a robust multi‑billion NPV at these grades and prices.
Tolling becomes much tighter: NPV under $1 B, highly sensitive to toll fee, mining cost, and grade/recovery uplift.
If you want, I can now run a break‑even NSR analysis for the tolling case — showing exactly what Cu/Au price or grade you’d need to push that NPV back into the $2–3 B range.
LOTM
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