GSCU Phase III Drilling vs GreenXmetals drilling results18 Jan 2026 13:04
I owe GSCU no GreenXmetals . Reading an article by Charles Archer about GreenX where he describes some drilling results released back in November as "exceptional", I asked Chatgpt to compare both drilling results. the result:
Below is a direct, technical comparison between the Mostaza Phase III results (Great Southern Copper) and the Ro-series results you’ve provided, focusing on grade, thickness, depth, and overall quality.
1. Headline Comparison (Like-for-Like)
Metric Mostaza (GSCU) Ro-series results
Peak Cu grade 9.76% Cu 2.7% Cu
Typical Cu grade 2–4% Cu 1–2% Cu
Peak Ag grade 700+ g/t Ag 55 g/t Ag
Typical Ag grade 150–300 g/t Ag 15–40 g/t Ag
Max intercept width 7.2 m @ 2.58% Cu 3.7 m @ 1.2% Cu
Depth to mineralisation 30–110 m 268–536 m
Mineralisation style High-level epithermal, chalcocite-rich Deeper, structurally controlled
2. Grade Comparison: Mostaza Is Significantly Stronger
Copper
Mostaza consistently reports 2–4× higher copper grades
Multiple ultra-high-grade spikes (>8–9% Cu) at Mostaza
Ro-series peaks at 2.7% Cu, with most intercepts closer to 1–1.5% Cu
Conclusion: Mostaza has a clear grade advantage, especially for selective underground or small-footprint mining.
Silver
Mostaza silver grades are an order of magnitude higher
Ro-series silver is meaningful but secondary
At Mostaza, silver can materially improve project economics
Silver is a major differentiator in favour of Mostaza.
3. Thickness & Continuity: Mostaza Slightly Better
Both systems show lens-style, narrow but high-grade mineralisation
Mostaza shows:
Multiple stacked lenses
Broader mineralised envelopes (6–7 m zones)
Ro-series intercepts are mostly single narrow hits
Mostaza shows better potential for mineable widths through lens stacking.
4. Depth & Development Implications: Major Advantage to Mostaza
Mostaza
Mineralisation from ~30–110 m depth
Low stripping, early underground access
Lower drilling and development costs
Ro-series
Mineralisation at ~270–530 m depth
Significantly higher:
Capital intensity
Development risk
Time to production
Depth alone gives Mostaza a strong economic and strategic advantage.
5. Geological Upside: Mostaza Has More Growth Optionality
Evidence for:
Stacked sulphide lenses
Multiple mineralising events
1 km of strike continuity
Ro-series appears:
Deeper
More structurally isolated
Less evidence (from provided data) of stacked repetition
6. Bottom-Line Comparison
Relative Quality Score (Exploration Stage)
Project Score (out of 10) Why
Mostaza (GSCU) 8.5–9.0 Higher grades, huge Ag credits, shallow depth, stacked lenses
Ro-series 6.5–7.0 Respectable grades but deeper, narrower, lower silver
Final Verdict
Mostaza’s Phase III results are clearly superior in terms of:
Grade (Cu and especially Ag)
Depth and development potential
Geological upside and scalability
The Ro-series results