Aston Bay Files Technical Report for Storm Copper Project Initial Mineral Resource Estimate

Rhea-AI Summary

Aston Bay Holdings (TSXV:BAY)(OTCQB:ATBHF) has filed a Technical Report for its Storm Copper Project in Nunavut, Canada, detailing an initial Mineral Resource Estimate (MRE). The report highlights:

Indicated Mineral Resources of 8.2 million tonnes at 1.47% copper and 4.5 g/t silver, containing 266.3 million pounds of copper and 1.185 million ounces of silver. Inferred Mineral Resources of 3.3 million tonnes at 1.30% copper and 3.1 g/t silver, containing 95.4 million pounds of copper and 333,600 ounces of silver.

The project shows low-cost development potential with over 90% of contained metal accessible through open-pit mining. All six deposits (Cyclone, Chinook, Corona, Cirrus, Lightning Ridge and Thunder) remain open for expansion. The project is a 20/80 joint venture between Aston Bay and American West Metals , with Aston Bay maintaining a free carried interest until a decision to mine.

Positive

• Substantial initial resource estimate with 266.3 Mlbs Cu in Indicated and 95.4 Mlbs Cu in Inferred categories
• Low-cost development potential with 90% of resources accessible via open-pit mining
• High-grade copper content averaging 1.47% Cu in Indicated and 1.30% Cu in Inferred resources
• Free carried interest until mining decision, reducing financial burden on Aston Bay
• Strategic partnership secured for up to 80% of initial capital development costs

Negative

• Only 56% of mineralized block model currently contained within conceptual mining areas
• No Measured Resources defined yet, requiring additional drilling
• Further metallurgical testing needed across multiple zones

TORONTO, ON / ACCESS Newswire / April 17, 2025 / Aston Bay Holdings Ltd. (TSXV:BAY)(OTCQB:ATBHF) ("Aston Bay" or the "Company") is pleased to announce that a new National Instrument 43-101 ("NI 43-101") Technical Report titled "Initial Mineral Resource Estimate and Technical Report on the Storm Copper Project, Aston Bay Property, Somerset Island, Nunavut, Canada" and dated effective February 7, 2025 (the "Report"), has been filed under the Company's SEDAR+ profile (www.sedarplus.ca).

The Report details an initial Mineral Resource Estimate ("MRE") for the near-surface mineralization (<120 metres ("m") depth) at the Storm Copper Project ("Storm" or the "Project") on Somerset Island, Nunavut (see Aston Bay news release dated March 3, 2025 - Aston Bay Announces Initial Mineral Resource Estimate for Near-Surface Mineralization at the Storm Copper Project, Nunavut, Canada). The MRE includes six near-surface copper (-silver) deposits within the greater Storm Copper area: Cyclone, Chinook, Corona, Cirrus, Lightning Ridge and Thunder.

Storm Copper Initial Mineral Resource Estimate Key Highlights

• Indicated Mineral Resources: 8.2 million tonnes at an average grade of 1.47% copper (Cu) and 4.5 grams per tonne (g/t) silver (Ag), containing 266.3 million pounds (Mlbs) (121,000 tonnes) of copper and 1.185 million ounces of silver (refer to Table 1 for MRE details).

• Inferred Mineral Resources: 3.3 million tonnes at an average grade of 1.30% Cu and 3.1 g/t Ag, containing 95.4 Mlbs (43,000 tonnes) of copper and 333,600 ounces of silver (refer to Table 1 for MRE details).

• Low-cost development potential:

  • Near-surface Mineral Resources accessed primarily with open-pit mining, accounting for over 90% of contained metal in the MRE.

  • 100% of MRE consists of fresh, chalcocite-dominant copper sulphide with metallurgical testwork, which confirms excellent beneficiation potential, including sorting (see Aston Bay news releases dated August 13, 2024 and April 11, 2022).

• Significant growth and expansion opportunities:

  • MRE deposits remain open - All six deposits remain open, offering strong potential for rapid expansion of the Mineral Resource inventory.

  • Cyclone Deeps discovery (2024) - Cyclone-style mineralization located immediately south and faulted down from the existing Cyclone Deposit (1.2% Cu over 10 m from 311 m down hole in drill hole ST24-01; see Aston Bay news release dated September 20, 2024).

  • New high-grade copper discoveries (2024) - The Gap (2.3% Cu over 20 m from 38 m down hole, including 5.3% Cu over 8 m in drill hole SR24-003; see Aston Bay news release dated July 2, 2024), Squall and Hailstorm are located near surface and ready for Mineral Resource definition drilling.

• Belt-scale exploration opportunity - <5% of the 110 kilometre ("km") long copper belt has been adequately explored. Priority targets include the Tempest, Tornado, Blizzard and Seabreeze Prospects, where surface copper-zinc gossans have been identified.

The Storm Copper Project is a 20/80 unincorporated joint venture between Aston Bay and American West Metals Limited ("American West"), the Project operator. Aston Bay maintains a free carried interest until a decision to mine is made upon completion of a Feasibility Study. The MRE and Report in this announcement were prepared by P&E Mining Consultants Inc. ("P&E") at the request of Aston Bay, independently of American West.

Thomas Ullrich, Chief Executive Officer of Aston Bay, commented:

"The filing of this initial Mineral Resource Estimate marks a significant milestone for Aston Bay and the Storm Copper Project. The results confirm the presence of a substantial, high-grade, near-surface copper resource with compelling development potential. Importantly, with all six deposits remaining open and multiple new discoveries made in 2024, we believe we are just scratching the surface of what Storm can deliver.

"Building on this strong foundation, the Company plans to release a Preliminary Economic Assessment in Q3 2025 to further demonstrate the potential of the Project. We recently announced a strategic partnership and funding package covering up to 80% of the initial capital for the development of Storm. This is a strong validation of the Project and highlights a low-risk pathway to potential development¹. We look forward to continuing to advance Storm alongside our partners at American West."

This announcement and the Mineral Resource Estimate for the Storm Project contained in it have been prepared solely by Aston Bay based on relevant available information and have not been reviewed or approved by American West, Aston Bay's Storm joint venture partner. American West is the manager of the Storm Joint Venture and holds the majority 80% joint venture interest. Whilst the information in this announcement pertaining to the estimation and reporting of the Mineral Resources has been reviewed and approved by a Qualified Person and the Mineral Resource estimate has been independently reviewed, the Company considers that it is possible that in preparing any future Mineral Resource Estimate or Mineral Reserve Estimate for the Storm Project, American West may adopt different interpretations, assumptions, parameters or plans, or make different judgements, to those used or made by Aston Bay in the Mineral Resource Estimate contained in this announcement.

Table 1: Indicated and Inferred Mineral Resource Estimate (Effective Date February 7, 2025^(1-9))

Classification	Zone	Cu Cut-off (%)	Category	Tonnage (kt)	Contained Cu (t)	Contained Cu (Mlbs)	Contained Ag (oz)	Cu %	Ag g/t
Open Pit Constrained Mineral Resource Estimate
Indicated	Chinook	0.35	Open Pit	712	14,700	32.4	99,900	2.07	4.36
	Cyclone	0.35	Open Pit	7,073	99,700	219.7	1,022,400	1.41	4.50
	Total Indicated	0.35	Open Pit	7,785	114,400	252.1	1,122,300	1.47	4.49
Inferred	Chinook	0.35	Open Pit	135	2,000	4.3	12,400	1.45	2.86
	Cirrus	0.35	Open Pit	505	3,300	7.2	21,000	0.65	1.29
	Corona	0.35	Open Pit	791	8,400	18.6	38,900	1.07	1.53
	Cyclone	0.35	Open Pit	532	9,400	20.8	110,800	1.77	6.48
	Lightning Ridge	0.35	Open Pit	189	2,500	5.5	31,400	1.33	5.17
	Thunder	0.35	Open Pit	756	11,200	24.7	49,600	1.48	2.04
	Total Inferred	0.35	Open Pit	2,908	36,800	81.1	264,100	1.27	2.82
Underground Constrained Mineral Resource Estimate
Indicated	Cyclone	1.0	Underground	444	6,500	14.2	63,100	1.45	4.42
Inferred	Cyclone	1.0	Underground	426	6,500	14.3	69,500	1.53	5.07
Combined Constrained Mineral Resource
Indicated	Global	0.35/1.0	Combined	8,229	120,900	266.3	1,185,400	1.47	4.48
Inferred	Global	0.35/1.0	Combined	3,334	43,300	95.4	333,600	1.30	3.11

Notes:

1. The Mineral Resources were estimated in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum (CIM), CIM Standards on Mineral Resources and Reserves, Definitions (2014) and Best Practices Guidelines (2019) prepared by the CIM Standing Committee on Reserve Definitions and adopted by the CIM Council.

2. Yungang Wu, M.Sc., P.Geo. of P&E Mining Consultants Inc. is the Qualified Person responsible for the completion of the Mineral Resource Estimation, with an effective date of February 7, 2025.

3. Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.

4. The quantity and grade of the reported Inferred Resources are uncertain in nature and there has not been sufficient work to define these Inferred Resources as Indicated or Measured Resources. It is reasonably expected that most of the Inferred Mineral Resources could be upgraded to Indicated Mineral Resources with continued exploration.

5. All figures are rounded to reflect the relative accuracy of the estimates. Tonnages have been rounded to the nearest 1,000 t. Contained metal values have been rounded to the nearest 100 copper tonnes or 100,000 copper pounds, and to the nearest 100 silver ounces, Totals may not sum due to rounding.

6. Bulk density was assigned based on geological formation. The following median bulk density value for each formation was used: 2.81 g/cm³ (ADMW), 2.78 g/cm³ (BPF), 2.76 g/cm³ (VSM), and 2.68 g/cm³ (Scs).

7. The Mineral Resource Estimation is limited to material contained within estimation domains modelled using a nominal 0.3% copper mineralized envelope. Open pit constrained Mineral Resources are reported within the constraining pit shells, applying a lower cut-off grade of 0.35% Cu. Underground constrained Mineral Resources report all material within the potentially mineable shapes, regardless of whether the estimated grades exceed the optimized cut-off grade.

8. The constraining pit optimization parameters included a mining cost of US$5.00/t for both mineralized and waste material, a processing cost of US$7.00/t processed, and a G&A cost of US$12.00/t processed, resulting in a total operating cost of US$24.00/t. The copper price was set at US$4.00/lb Cu, with process recoveries of 75% for Cu and pit slopes of 45°.

9. Underground Mineral Resources include blocks below the constraining pit shell within underground potentially mineable shapes. A mining cost of US$47/t, in addition to the economic assumptions above, results in an underground Cu cut-off of 1.0%. Potentially mineable shapes encapsulate material within domains with a minimum vertical mining height of 2.5 m. All "take all" material within the potentially mineable shapes is reported, regardless of whether the estimated grades are above the optimized cut-off grade.

The Project also includes the Seal Zinc Deposit, which is located 28 km northwest of the Storm Copper MRE deposits on the northern shore of Aston Bay. The Seal Zinc Deposit hosts current Inferred Mineral Resources of 1.006 million tonnes at an average grade of 10.24% zinc (Zn) and 46.5 g/t Ag, containing 103,000 tonnes of zinc and 1,505,000 ounces of silver. A cut-off of 4.0% zinc equivalent (ZnEq) was applied, using the formula ZnEq% = Zn% + (Ag g/t / 39). The Seal Zinc Deposit MRE was prepared by P&E, with an effective date of October 6, 2017. A supporting Technical Report titled, "Initial Mineral Resource Estimate and Technical Report for the Seal Zinc Deposit, Aston Bay Property, Somerset Island, Nunavut," was also prepared by P&E and is available under the Company's SEDAR+ profile (www.sedarplus.ca).

Storm Copper Mineral Resource Estimation and Classification Methodology

Ordinary Kriging with locally varying anisotropy was used to estimate copper and silver grades within a 5.0 m (X) by 5.0 m (Y) by 2.5 m (Z) block model. The grade estimation process considered capped drill hole composites to ensure appropriate representation of shorter high-grade assays.

Two distinct mineralization styles have been identified at the Storm Copper Project: horizontal, strata-bound mineralization and steeply dipping, structurally controlled mineralization. Certain zones within the project exhibit both styles.

Indicated Mineral Resource block grade interpolation requires data from at least three drill holes within a search ellipse of 75 m by 75 m by 10 m for stratigraphic and mixed mineralization zones, and 35 m by 25 m by 10 m for structural mineralization zones. Inferred Mineral Resource grade interpolation requires data from at least two drill holes within a search ellipse of 120 m by 120 m by 10 m for stratigraphic mineralization, 85 m by 60 m by 10 m for structural mineralization, and 90 m by 90 m by 10 m for mixed mineralization zones. Only composites within a given grade estimation domain were used within that domain.

Measured Mineral Resources have not yet been defined. Further drilling is recommended to improve geological understanding and refine mineralization controls at the Storm Copper Project. Additional metallurgical testing across multiple zones will also be essential to characterize the metallurgical properties of the different mineralized areas.

The Storm MRE tonnage constrained to conceptual open pits and undergrounds represents 56% of the mineralized block model. As potential prices of copper and/or the metallurgical, mining, processing or other costs change, the other 44% of the model not currently contained within the conceptual open pits or undergrounds represents a target for future exploration.

Sampling and Quality Assurance/Quality Control

The analytical work reported herein was performed by ALS Global ("ALS"), Vancouver, Canada. ALS is an ISO-IEC 17025:2017 and ISO 9001:2015 accredited geoanalytical laboratory and is independent of Aston Bay Holdings Ltd., American West Metals Limited, and the QP.

Samples were subject to 33-element geochemistry by four-acid digestion and inductively coupled plasma-atomic emission spectroscopy (ICP-AES) to determine concentrations of copper, silver, lead, zinc, and many other elements (ALS Method ME-ICP61a). Overlimit analyses for copper were re-assayed using an ore-grade four-acid digestion with an ICP finish.

Aston Bay Holdings Ltd. and American West Metals Limited followed industry standard procedures for the work carried out on the Storm Project, incorporating a quality assurance/quality control (QA/QC) program. Blank, duplicate, and certified reference materials (CRM) were inserted into the sample sequence and sent to the laboratory for analysis. QA/QC samples represented approximately 13% of all analytical samples. CRMs and blanks were inserted at a rate of one QAQC sample per 10 samples, and duplicates were collected at a rate of three per 100 samples. No significant QA/QC issues were detected during the review of the data.

Aston Bay Holdings Ltd. and American West Metals Limited are not aware of any drilling, sampling, recovery, or other factors that could materially affect the accuracy or reliability of the data referred to herein.

Qualified Person

The Storm Copper Initial MRE was completed by Yungang Wu, M.Sc., P.Geo. of P&E Mining Consultants Inc. Mr. Wu is a Qualified Person as defined by the NI 43-101 Standards of Disclosure for Mineral Projects and is independent of the Company. Mr. Wu has reviewed and verified the technical data disclosed in this news release related to the MRE.

Michael Dufresne, M.Sc., P.Geol., P.Geo., is a Qualified Person as defined by the NI 43-101 Standards of Disclosure for Mineral Projects, and has reviewed and approved the scientific and technical information in this press release.

About Aston Bay Holdings

Aston Bay is a publicly traded mineral exploration company exploring for high-grade critical and precious metal deposits in North America.

The Company is currently exploring the Storm Copper Property and Cu-Ag-Zn-Co Epworth Property in Nunavut. The Company is also in advanced stages of negotiation on other lands with high-grade precious and critical metals potential in North America

The Company and its joint venture partners, American West Metals Limited and its wholly-owned subsidiary, Tornado Metals Ltd. (collectively, "American West"), have formed a 20/80 unincorporated joint venture in respect of the Storm Project property, which hosts the Storm Copper Project and the Seal Zinc Deposit. Under the unincorporated joint venture, Aston Bay shall have a free carried interest until American West has made a decision to mine upon completion of a bankable feasibility study, meaning American West will be solely responsible for funding the joint venture until such decision is made. After such decision is made, Aston Bay will be diluted in the event it does not elect to contribute its proportionate share and its interest in the Storm Project property will be converted into a 2% net smelter returns royalty if its interest is diluted to below 10%.

FORWARD-LOOKING STATEMENTS

Statements made in this news release, including those regarding entering into the joint venture and each party's interest in the Project pursuant to the agreement in respect of the joint venture, management objectives, forecasts, estimates, expectations, or predictions of the future may constitute "forward-looking statement", which can be identified by the use of conditional or future tenses or by the use of such verbs as "believe", "expect", "may", "will", "should", "estimate", "anticipate", "project", "plan", and words of similar import, including variations thereof and negative forms. This press release contains forward-looking statements that reflect, as of the date of this press release, Aston Bay's expectations, estimates and projections about its operations, the mining industry and the economic environment in which it operates. Statements in this press release that are not supported by historical fact are forward-looking statements, meaning they involve risk, uncertainty and other factors that could cause actual results to differ materially from those expressed or implied by such forward-looking statements. Although Aston Bay believes that the assumptions inherent in the forward-looking statements are reasonable, undue reliance should not be placed on these statements, which apply only at the time of writing of this press release. Aston Bay disclaims any intention or obligation to update or revise any forward-looking statement, whether as a result of new information, future events or otherwise, except to the extent required by securities legislation.

Neither TSX Venture Exchange nor its regulation services provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.

For more information contact:

Thomas Ullrich, Chief Executive Officer
thomas.ullrich@astonbayholdings.com
(416) 456-3516

Sofia Harquail, IR and Corporate Development
sofia.harquail@astonbayholdings.com
(647) 821-1337

¹For additional information on the strategic partnership and funding package, please refer to Aston Bay news release dated April 9, 2025 - Aston Bay Announces Strategic Partnership for the Storm Copper Project, Nunavut, Canada.

SOURCE: Aston Bay Holdings Ltd.

View the original press release on ACCESS Newswire

FAQ

What are the key highlights of Aston Bay's (ATBHF) Storm Copper Project mineral resource estimate?

The project contains 266.3 Mlbs copper in Indicated Resources (8.2Mt at 1.47% Cu) and 95.4 Mlbs copper in Inferred Resources (3.3Mt at 1.30% Cu), with over 90% accessible through open-pit mining.

How much silver is contained in ATBHF's Storm Copper Project resource estimate?

The resource contains 1.185 million ounces of silver in Indicated Resources (4.5 g/t) and 333,600 ounces in Inferred Resources (3.1 g/t).

What is the ownership structure of ATBHF's Storm Copper Project?

The project is a 20/80 joint venture between Aston Bay Holdings and American West Metals , with Aston Bay maintaining a free carried interest until a decision to mine.

What are the expansion opportunities at ATBHF's Storm Copper Project?

All six deposits remain open for expansion, with new discoveries including Cyclone Deeps, The Gap (2.3% Cu over 20m), Squall and Hailstorm, plus additional prospects at Tempest, Tornado, Blizzard and Seabreeze.