Canterra’s 55% Lundberg copper resource lift: grade–tonnage trade-offs for mine planners
Reviewed by Joe Ashwell

First reported on MINING.com
30 Second Briefing
Canterra Minerals has lifted indicated resources at the Lundberg copper-zinc deposit in Newfoundland by 55% to 26.1 million tonnes at 0.36% Cu, 1.31% Zn and 0.56% Pb, using a pit shell with a 3.16:1 strip ratio and higher metal-price assumptions of US$4.97/lb Cu and US$3,285.90/oz Au. Contained indicated metal now totals 94,800 tonnes Cu, 341,600 tonnes Zn and 146,200 tonnes Pb, while copper-equivalent grade has fallen 13% to 0.87% and individual metal grades are down 12–14%. Canterra is pivoting drilling to higher-grade zones along the 2.5-km Buchans trend, including Two Level and the Lemarchant satellite, to support a hub-and-spoke development concept around the former Buchans mine.
Technical Brief
- Updated Lundberg estimate reports 5.02 g/t Ag and 0.06 g/t Au in the indicated category.
- Inferred resource totals 870,000 tonnes at 0.48% Cu, 2.21% Zn, 1.13% Pb, 20.87 g/t Ag, 0.28 g/t Au.
- Contained inferred metals: 4,200 t Cu, 19,200 t Zn, 9,900 t Pb, 580,000 oz Ag, 7,800 oz Au.
- Pit shell captures 97% of total tonnage as indicated, but is explicitly a reporting constraint, not a mine plan.
- Metal-price assumptions increased to US$4.97/lb Cu, US$1.35/lb Zn, US$0.95/lb Pb, US$42.30/oz Ag, US$3,285.90/oz Au.
- June hole H-26-3561 at Lundberg intersected 57.2 m at 0.57% CuEq, confirming open extensions.
- September drilling cut 144 m at 0.75% CuEq, including 76 m at 1.0% CuEq, supporting bulk-tonnage potential.
- Two Level hole H-25-3542 returned 4.45 m at 1.11% Cu, 11.38% Zn, 7.02% Pb, 125.5 g/t Ag, 1.24 g/t Au.
- Lemarchant historical resource: 2.4 Mt indicated at 0.68% Cu (~16,500 t Cu) plus 0.56 Mt inferred at 0.45% Cu (~2,500 t Cu).
Our Take
With Lundberg’s indicated copper-equivalent grade now at 0.87% and a strip ratio of 3.16:1, the project will likely need to lean heavily on scale, by-product credits (zinc, lead, silver, gold) and existing regional infrastructure at Buchans to stay competitive against other Canadian VMS-style copper-zinc assets in our database.
Across our 306 copper- and zinc-tagged pieces, there are relatively few junior developers with seven resource-stage deposits in a single historic camp as Canterra has in the Buchans district, which gives the company optionality for a future hub-and-spoke development or toll-milling strategy rather than a single-asset build.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
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