Murray Brook Minerals Releases Updated Resource Estimate for Its Legacy Cu-Ag Deposit
Rhea-AI Summary
Puma Exploration (PUMXF) subsidiary Murray Brook Minerals received an updated NI 43-101 reporting an inferred resource of 930,000 tonnes grading 0.66% Cu (13.4M lbs Cu) and 3.65 g/t Ag (110,000 oz Ag) at the Legacy Project, effective Nov 28, 2025.
The deposit starts at surface, is contained within a Whittle pit shell at a US$10/t cutoff, and shows expansion potential below the pit. MBM closed a $250,000 FT private placement; Puma holds ~71.6% of MBM.
AI-generated analysis. Not financial advice.
Positive
- Inferred resource: 930,000 tonnes
- Contained copper: 13.4M lbs Cu
- Contained silver: 110,000 oz Ag
- Deposit starts at surface, amenable to open pit
- Closed $250,000 flow-through financing
- Puma ownership: 71.6% of MBM
Negative
- Resource classified as Inferred only, no demonstrated economic viability
- Estimate based solely on historical drilling, many holes from 1970s
- Mineralization below pit excluded pending further drilling
- Historical sampling was selective, possibly biasing grades
News Market Reaction – PUMXF
On the day this news was published, PUMXF declined 0.09%, reflecting a mild negative market reaction.
Data tracked by StockTitan Argus on the day of publication.
Rimouski, Quebec--(Newsfile Corp. - April 22, 2026) - Puma Exploration Inc. (TSXV: PUMA) ("Puma") announces that its subsidiary, Murray Brook Minerals Inc. ("MBM" or the "Company"), has received an updated NI 43-101 Technical Report for its
The updated resource estimate, based solely on historical drilling results, outlines a 930,000 tonnes inferred resource at the Legacy Deposit, containing 13,400,000 lbs Cu @
Figure 1. Legacy Copper-Silver Deposit
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"This technical report for the Legacy Project satisfies the first requirement to list Murray Brook Minerals on a stock exchange. Our aim is to create a separate resource company with MBM, similar to what we accomplished with Canadian Copper, which has proven to be a very successful transaction. As this new spinoff becomes more concrete, we'll announce further details, including the potential distribution of MBM shares to Puma shareholders," noted Marcel Robillard, President and CEO of Puma Exploration. Presently, the proposed spinoff transaction is conceptual, and there is no guarantee it will proceed or be completed.
2025 NI 43-101 Mineral Resource Estimate
SRK Consulting (Canada) was contracted to update its 2015 mineral resource estimate for the Legacy Project (Nowak et al., 2015). 74 historical drill holes used to estimate the resource - 11 were drilled by MBM from 2013 to 2014, while the majority were drilled between 1970 and 1978 by several operators.
Historically, drill holes were selectively sampled at intervals of less than 2 metres, targeting only visible sulphide mineralization. They were primarily assayed for copper and silver. The MBM drill holes also included some assays for gold and zinc.
For the 2025 resource estimation, SRK capped assays at
A Whittle optimized pit shell was applied to constrain the mineral resource estimate. The pit shell was designed using a dollar-value cutoff calculated from the copper and silver grades, using US
Historical drilling and the resource model suggest that mineralization continues at depth and that additional tonnage could be delineated through further drilling.
Table 1 Legacy Mineral Resource Statement, SRK, November 28, 2025, at US
| Category | Cut-off | Quantity | Grade | Contained Metal | |||
| (US$ Value) | (x1000 Tonnes) | Cu (%) | Ag (g/t) | Cu (x1000 Lb) | Ag (x1000 Oz) | ||
| Inferred | In Pit | > 10 | 930 | 0.66 | 3.65 | 13,400 | 110 |
Notes:
- The in-pit portion is reported at a dollar equivalent cut-off value of US
$10 per tonne within a Whittle shell. The Whittle shell was designed based on a slope angle of 45 degrees and90% recovery for copper and56% for silver. - Dollar and Silver Equivalents are based on US
$4.20 Copper, and$30 Silver
Mineral resources are not mineral reserves and do not have demonstrated economic viability.
Historical drilling highlights
Between 1968 and 1998, 63 historical diamond holes were drilled on the Legacy Deposit. In 2013 and 2014, MBM drilled an additional 11 diamond holes and excavated 10 trenches. Some historical drilling highlights are listed below:
In 1970, drill hole R-17 returned a discontinuous section of 150.57 m @
- 11.28 m @
3.16% Cu (152.40-163.68 m) - 5.94 m @
1.97% Cu (221.81-228.75 m) - 11.19 m @
0.95% Cu (244.08-255.27 m)
Other drilling intervals returned impressive results:
R-13 : 17.07 m @
R-16 : 28.68 m @
S-77-4: 2.13 m @
R-21: 4.02 m @
R-03: 9.97 m @
R-07: 13.08 m @
R-17: 4.81 m @
R-14: 5.64 m @
R-20: 10.03 m @
S-78-8: 3.51 m @
Also, the gold potential at Legacy was never assessed, but drill hole MC-92-20 returned 4.00 m of
Increased tonnage potential
The current pit tonnage is constrained to the area near-surface where historical drilling density was sufficient to estimate an inferred resource (Figure 1). Tonnage inside the pit could be substantially increased by twinning some of the older holes that were only selectively sampled. Also, most of the blocks shown below the pit are supported by only very few drill holes. Additional drilling below the pit could identify smaller, higher-grade zones amenable to underground mining.
A two-phase exploration program, with phase I consisting of further surface exploration, including trenching and drilling, and phase II consisting of infill and exploration drilling, is planned for 2026-27.
MURRAY BROOK MINERALS CLOSES
Puma Exploration Inc.'s subsidiary, Murray Brook Minerals Inc. (MBM), closed a non-brokered offering (the "Offering") consisting of 5.0 million flow-through ("FT") common shares of MBM at a price of
The net proceeds of the FT units will be used to incur eligible Canadian exploration expenses and flow-through mining expenditures, as defined under the Income Tax Act (Canada), that will be renounced in favour of the purchasers, with an effective date of no later than Dec. 31, 2026. The funds will advance exploration of the Legacy Project located in Northern New Brunswick.
No finder's fees were paid in connection with the closing of the Offering.
Certain directors and other insiders of the Company participated in the FT private placement. They subscribed for 700,000 FT shares at an aggregate amount of
MORE ABOUT THE LEGACY PROJECT
The Legacy Project consists of four (4) easily accessible claim blocks covering 10,868 hectares, less than 15 km from Puma's exploration office in Saint-Quentin, New Brunswick. The project is contiguous to Puma's McKenzie Gold Project and remains mainly underexplored by modern methods. It hosts high-grade copper-silver skarn mineralization, similar to Osisko Metals' Gaspé Copper in Québec. The Legacy and Gaspé Copper projects share many similarities-they are part of the same Appalachian orogenic system, are the same age, and have similar mineralization and metal associations.
The qualified person has not verified the information on the Gaspe Copper Project and the information on the Gaspe Copper Project is not necessarily indicative of the mineralization on the Legacy property that is the subject of the technical report.
Copper-dominant skarn deposits represent the most common type of skarn and an important source of copper. In Canada, they account for approximately
PUMA EXPLORATION'S DEAR STRATEGY
As part of Puma's successful DEAR strategy - Discovery, Exploration, Acquisition, and Royalties - the Murray Brook Minerals business model is to acquire prospective strategic and critical metals mineral properties with excellent discovery potential that a stand-alone public company can explore and develop. This business model provides Puma's investors with equity interests in another explorer and developer and exposure to other commodities. At the same time, Puma continues to focus on its gold assets.
Following its gold discovery at Williams Brook in 2021, Puma spun off its base metal assets, including Murray Brook West, Chester, and Turgeon, to ensure their proper development and build long-term value.
As a result, Puma currently holds (share prices at market close on April 21, 2026):
- 11,181,058 shares of Canadian Copper (CSE: CCI), trading at
$0.66 CAD (~$7.38M ) - 23,951,040 shares of Raptor Metals Ltd (AUX: RAP), trading at
$0.053 AUD (~$1.27M AUD) - 2,700,000 shares of BWR Exploration Inc. (TSXV: BWR), trading at
$0.02 CAD (~$54 K) - 23,644,165 shares of Murray Brook Minerals (not publicly listed)
Puma also maintains the following net smelter return (NSR) royalties:
2% NSR on Murray Brook West2% NSR on Chester West1% NSR on Beresford Copper2% NSR on Little Stull Lake
QUALIFIED PERSON AND NI 43-101 DISCLOSURE
The scientific and technical content of this press release has been prepared, reviewed, and approved by Dominique Gagné, who is a "Qualified Person" as defined by National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101").
The scientific and technical information related to the Legacy Project in this news release is outlined in the Independent Technical Report for the Legacy Project, Restigouche County, New Brunswick, Canada, prepared by SRK Consulting (Canada) Inc., Dr. Gilles Arseneau, P.Geo., effective November 28, 2025.
The mineral resource presented herein has been estimated in conformity with generally accepted CIM Estimation of Mineral Resource and Mineral Reserves Best Practices guidelines (CIM, 2019). It is reported in accordance with the NI 43-101. The resource estimate was completed by Dr. Gilles Arseneau, P. Geo. (APEGBC #23474), an "independent competent person" as defined in NI 43-101. Mineral resources are not mineral reserves and do not have demonstrated economic viability.
ABOUT MURRAY BROOK MINERALS
Murray Brook Minerals Inc. ("MBM") is a private Canadian mineral exploration company advancing its
ABOUT PUMA EXPLORATION
Puma Exploration is a Canadian mineral exploration company focused on identifying and developing a pipeline of precious metals projects in New Brunswick, near Canada's Renowned Bathurst Mining Camp. Puma has a long history in Northern New Brunswick, having worked on regional projects for over 23 years.
Puma's successful exploration methodology, which combines traditional prospecting methods with detailed trenching and cutting-edge technologies such as Artificial Intelligence, has been instrumental in understanding the region's geology and associated mineralized systems. Armed with geophysical surveys, geochemical data, and consultants' expertise, Puma has developed a cost-effective exploration tool to discover gold at shallow depths and maximize drilling results.
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Visit www.explorationpuma.com for more information or contact:
Marcel Robillard, President and CEO.
(418) 750-8510; president@explorationpuma.com
Mia Boiridy, Head of Investor Relations and Director.
(250) 575-3305; mboiridy@explorationpuma.com
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
Forward-Looking Statements: This press release may contain forward-looking statements. Such forward-looking statements involve several known and unknown risks, uncertainties, and other factors that may cause the actual results, performance, or achievements of Puma to differ materially from those expressed or implied by such forward-looking statements. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date the statements were made, except as required by law. Puma undertakes no obligation to publicly update or revise any forward-looking statements. The quarterly and annual reports, as well as the documents submitted to the securities administration, describe these risks and uncertainties.
To view the source version of this press release, please visit https://www.newsfilecorp.com/release/293715