Burgundy Diamond Mines has reported a 6% increase in Probable Ore Reserves at its Ekati diamond mine for 2025, offsetting a 4% depletion in Indicated Mineral Resources due to ongoing mining and revised pit designs.
- 6% increase in Probable Ore Reserves at Ekati
- 4% depletion in Indicated Mineral Resources from mining
- Lynx open pit resources removed due to flooding
- Updated geological models and prefeasibility studies underpin changes
- Mining ongoing at Sable, Misery Main, and Point Lake
Ore Reserves Rise Despite Resource Depletion
Burgundy Diamond Mines Limited (ASX:BDM) has unveiled its 2025 Mineral Resources and Ore Reserves update for the Ekati diamond mine, revealing a nuanced picture of the operation’s underground and open pit assets. While Indicated Mineral Resources have declined by 4% due to mining depletion, Probable Ore Reserves have increased by 6%, reflecting revised pit designs and an updated prefeasibility study for the Fox underground pipe.
The company reports mining activity continued through 2025 at the Sable open pit, Misery Main underground, and Point Lake open pit. Notably, Lynx Mineral Resources were removed from the statement as the open pit has been flooded for reclamation purposes, signaling a shift away from that asset.
Geological Model Updates Drive Reserve Growth
The increase in Ore Reserves owes much to the updated geological models, particularly at Fox and Sable. The Fox Mineral Resource model was revised following additional drilling and a new prefeasibility study completed in 2025, which supports underground mining using a sublevel retreat method. Similarly, the Sable open pit saw changes to its operating pit design, aimed at unlocking additional ore at the pit bottom after mining was briefly paused in 2025 and resumed in early 2026.
These technical updates have translated into a 2.4 million tonne (Mt) increase in Probable Ore Reserves, now totaling 42.9 Mt at an average grade of 0.4 carats per tonne (cpt), yielding 16.1 million carats (Mct). This contrasts with the 2024 Ore Reserves of 40.5 Mt at 0.4 cpt and 16.8 Mct, with minor variation in carat estimates likely due to rounding and updated recovery assumptions.
Resource Depletion Reflects Active Mining and Model Refinement
On the Mineral Resources front, the statement reports a total of 124.7 Mt at 1.1 cpt for 131.5 Mct, down from 130.4 Mt at 1.0 cpt for 136.2 Mct in 2024. This 4% decrease in Indicated Resources and 0.2% in Inferred Resources is consistent with ongoing production drawdown at active pits and underground operations. The Misery Main Mineral Resource model was updated with bulk sample and drilling data from 2025, refining grade and tonnage estimates.
Mining at Point Lake was suspended mid-2025 after initial stripping began in late 2024, reflecting operational challenges that have also impacted the company’s financial results earlier in the year. The suspension at Point Lake followed tariff-driven pressures and operational adjustments, as detailed in Burgundy’s recent financial disclosures.
Robust Governance and Environmental Compliance
Burgundy’s reporting adheres strictly to the JORC Code 2012 and ASX Listing Rules, with Mineral Resources and Ore Reserves prepared by Competent Persons registered with the Northwest Territories and Nunavut Association of Professional Engineers and Geoscientists. The company maintains rigorous internal controls and governance over resource estimation, supported by extensive drilling, sampling, and processing data accumulated over more than two decades of Ekati’s operation.
Environmental stewardship remains a priority, with Ekati operating under comprehensive Environmental Agreements and permits with Canadian regulatory bodies. The removal of Lynx resources due to flooding aligns with reclamation efforts and regulatory compliance, underscoring Burgundy’s commitment to sustainable mine closure practices.
Operationally, the company continues to leverage its experience with both open pit and underground mining methods, including sublevel retreat mining at Misery Main and Fox. Processing plant configurations and recovery factors are regularly updated to reflect technological and operational advances, ensuring Ore Reserve estimates remain aligned with realistic production expectations.
While the report does not provide explicit forward-looking production guidance, the updated resource and reserve figures will be critical inputs for valuation models and operational planning. Burgundy’s ability to increase Ore Reserves amid resource depletion signals effective mine management and the potential for sustained diamond production from Ekati’s portfolio.
These developments come on the heels of Burgundy’s recent financial challenges and loan facility expansions, reflecting a company navigating complex market and operational headwinds while maintaining a focus on its core asset base. The interplay between reserve growth and prior operational suspensions, such as at Point Lake, will be a key theme for observers tracking Burgundy’s path forward.
Investors may also note Burgundy’s recent Canadian loan facility expansion and its efforts to manage cash flow amid tariff-related disruptions, as well as the company’s ongoing disclosure defense on related-party funding that underpin its financial strategy during this period.
Bottom Line?
Burgundy’s 2025 update balances resource depletion with reserve growth, underscoring the importance of geological refinement and mine design in sustaining Ekati’s production potential.
Questions in the middle?
- How will the suspension and resumption of mining at Point Lake affect near-term production?
- What operational challenges and opportunities arise from the flooding and reclamation of Lynx open pit?
- How might evolving diamond price assumptions impact future Ore Reserve conversions and mine planning?