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AbraSilver Expands Diablillos Mineral Resource Estimate to 248 Million Ounces Contained Silver and 2.5 Million Ounces Contained Gold (454 Moz AgEq) in M&I

06.05.2026  |  Newsfile

Highlights Strong Growth at Oculto & Significantly Expands Heap Leach Component

Toronto, May 6, 2026 - AbraSilver Resource Corp. (TSX: ABRA) (OTCQX: ABBRF) ("AbraSilver" or the "Company") is pleased to report an updated Mineral Resource estimate ("MRE") on the Company's wholly owned Diablillos property in Argentina ("Diablillos" or the "Project").

The updated MRE demonstrates significant growth across the Project, with Measured & Indicated ("M&I") resources now totaling 232 million tonnes ("Mt"), containing approximately 248 million ounces ("Moz") of silver and 2.54 Moz of gold (454 Moz silver-equivalent "AgEq"). The contained metal in M&I has increased by a substantial 25% for silver, 48% for gold and 30% for silver-equivalent since the prior mineral resource estimate (the "Prior MRE") from July 2025.

The updated MRE incorporates approximately 13,270 metres ("m") of additional drilling completed since the Prior MRE, bringing the total drilling database at Diablillos to over 170,000 m. The estimate includes mineralization amenable to tank or heap leach processing routes and reflects continued growth across all five deposits at Diablillos - Oculto, JAC, Fantasma, Laderas and Sombra - driven by recent drilling success, improved geological understanding, and updated economic assumptions. The MRE is based on drilling up to December 31, 2025 and does not include any of the Phase VI drilling completed since.

Key Highlights of the Updated MRE (Combined Tank and Heap Leach):

Key Changes Compared to Prior MRE (Tank Leach Only):

John Miniotis, President and CEO, commented, "We're extremely pleased to deliver yet another strong Mineral Resource update at Diablillos, with total M&I now exceeding 450 million ounces of silver-equivalent. This update reflects continued growth in our core deposits while also highlighting a large-scale heap leach opportunity that could enhance the Project's overall development profile. With the DFS on track for completion in Q2 2026, we are progressing toward a formal construction decision, while continuing to generate additional value through ongoing exploration success."

David O'Connor, Chief Geologist, stated, "The updated MRE demonstrates the strong growth potential at Diablillos, particularly at Oculto, where recent drilling continues to successfully expand mineralization. Importantly, the property remains highly-prospective, with multiple target areas still largely untested, and drilling from the ongoing Phase VI program continues to highlight the potential for further meaningful resource growth."

April 2026 Mineral Resource Estimate Statement

Table 1 - Total Diablillos Mineral Resource Summary (Tank & Heap Leach) - As of April 30, 2026.

Zone Category Tonnes
(000 t)
Ag
(g/t)
Au
(g/t)
AgEq
(g/t)
Contained Ag
(000 Oz)
Contained Au
(000 Oz)
Contained AgEq
(000 Oz)
Tank
Leach
Oxides Measured 41,042 100 0.68 159 131,668 896 209,281
Indicated 60,978 41 0.58 92 81,060 1,143 180,078
Measured & 102,021 65 0.62 119 212,728 2,039 389,359
Indicated
Inferred 14,400 25 0.57 74 11,468 262 34,187
Heap
Leach
Oxides Measured 25,469 13 0.09 19 10,997 76 15,425
Indicated 104,491 7 0.13 15 24,328 428 49,342
Measured & 129,960 8 0.12 16 35,325 503 64,767
Indicated






Inferred 34,947 6 0.14 14 6,939 158 16,153
Total Oxides Measured 66,512 67 0.45 105 142,665 971 224,706
Indicated 165,469 20 0.30 43 105,388 1,570 229,420
Measured &
Indicated
231,981 33 0.34 61 248,053 2,542 454,127
Inferred 49,347 12 0.26 32 18,406 420 50,340

Refer to footnotes in Tables 2 and 4

Table 2 - Diablillos Mineral Resource Estimate by Deposit (Tank Leach Material Only) - As of April 30, 2026.

Deposit Zone Category Tonnes
(000 t)
Ag
(g/t)
Au
(g/t)
AgEq
(g/t)
Contained Ag
(000 Oz)
Contained Au
(000 Oz)
Contained AgEq
(000 Oz)
Oculto Oxides Measured 31,443 85 0.86 159 85,507 870 160,890
Indicated 51,617 34 0.66 91 55,745 1,099 150,983
Measured &
Indicated
83,059 53 0.74 117 141,252 1,969 311,872
Inferred 12,145 17 0.62 71 6,705 244 27,810
JAC Oxides Measured 9,600 150 0.08 157 46,161 26 48,392
Indicated 5,192 115 0.04 118 19,125 7 19,729
Measured &
Indicated
14,792 137 0.07 143 65,286 33 68,120
Inferred 874 121 0.01 122 3,407 0 3,432
Fantasma Oxides Measured - - - - - - -
Indicated 1,738 74 0.01 75 4,149 0 4,176
Measured &
Indicated
1,738 74 0.01 75 4,149 0 4,176
Inferred 337 75 0.01 76 814 0 822
Laderas Oxides Measured - - - - - - -
Indicated 1,520 15 0.66 72 726 32 3,501
Measured &
Indicated
1,520 15 0.66 72 726 32 3,501
Inferred 988 14 0.57 63 435 18 2,017
Sombra Oxides Measured - - - - - - -
Indicated 912 45 0.15 58 1,314 4 1,689
Measured &
Indicated
912 45 0.15 58 1,314 4 1,689
Inferred 56 59 0.00 59 106 0 106
Total (tank leach) Oxides Measured 41,042 100 0.68 159 131,668 896 209,281
Indicated 60,978 41 0.58 92 81,060 1,143 180,078
Measured &
Indicated
102,021 65 0.62 119 212,728 2,039 389,359
Inferred 14,400 25 0.57 74 11,468 262 34,187
  1. Mineral Resources are not Mineral Reserves and have not demonstrated economic viability.
  2. The formula for calculating AgEq is as follows: Silver Eq Oz = Silver Oz + Gold Oz x (Gold Price/Silver Price) x (Gold Recovery/Silver Recovery).
  3. The Mineral Resource model was populated using Ordinary Kriging grade estimation within a three-dimensional block model and mineralized zones defined by wireframed solids, which are a combination of lithology and alteration domains. The 1m composite grades were capped where appropriate.
  4. The Mineral Resource is reported inside a conceptual Whittle open pit shell derived using US$ 34.50/oz Ag price, US $3,200/oz Au price, 86.6% process recovery for Au, and 80.9% process recovery for Ag, for the tank leaching and 74.3% process recovery for Au, and 46.8% process recovery for Ag, for the secondary heap leaching.
  5. Open pit optimization was constrained using a dual-process approach, with tank leaching as the primary process (total opex of US$32.30/t) and heap leaching as the secondary process (total opex of US$7.00/t).
  6. The MRE has been categorized in accordance with the CIM Definition Standards (CIM, 2014).
  7. A Net Value per block [NVB] calculation was used to constrain the Mineral Resource, determine the "Benefits = Income-Cost", where, Income = [(Au Selling Price (US$/oz) - Au Selling Cost (USD/Oz)) x (Au grade (g/t)/31.1035)) x Au Recovery (%)] + [(Ag Selling Price (US$/oz) - Ag Selling Cost (USD/Oz)) x (Ag grade (g/t)/31.1035)) x Ag Recovery (%)] and Cost = Mining Cost (US$/t) + Process Cost (US$/t) + Transport Cost (US$/t) + G&A Cost (US$/t) + [Royalty Cost (%) x Income]
  8. The Mineral Resource is sub-horizontal with sub-vertical feeders and has a reasonable prospect for eventual economic extraction by open pit methods.
  9. In-situ bulk densities were assigned to each model domain, according to samples averages for each lithology domain, separated by alteration zones and subset by oxidation.
  10. All tonnages reported are dry metric tonnes and ounces of contained gold are troy ounces.
  11. Mining recovery and dilution factors have not been applied to the Mineral Resource estimates.
  12. The Mineral Resource was estimated by Luis Rodrigo Peralta, B.Sc., FAusIMM CP (Geo), an INSA Consultora Managing Principal Geologist, and an Independent Qualified Person under NI 43-101.
  13. Mr. Peralta is not aware of any environmental, permitting, legal, title, taxation, socio-political, marketing, or other relevant issues that could materially affect the potential development of the Mineral Resource.
  14. All figures are rounded to reflect the relative accuracy of the estimates. Minor discrepancies may occur due to rounding to appropriate significant figures.



Figure 1 - Diablillos Pit Shell Comparison (2026 vs. 2025) Highlighting Resource Growth

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/11792/296232_f6969a39f41eda29_001full.jpg

Updated Tank Leach Mineral Resource Demonstrates Strong Growth at Core Deposits

The updated tank leach MRE reflects continued expansion across the core Oculto and JAC deposits, supported by recent drilling that has improved both scale and confidence in the resource.

Table 3 - Comparison of the April 2026 Tank Leach M&I MRE to the July 2025 Prior Estimate.

Deposit
Category Tonnes
(000 t)
Ag
(g/t)
Au
(g/t)
Contained Ag
(k oz Ag)
Contained
Au
(k oz Au)
Oculto Current Resource Measured &
Indicated
83,059 53 0.74 141,252 1,969
Prior
Resource
Measured &
Indicated
57,382 67 0.82 123,321 1,505
Variance (%) 45% -21% -10% 15% 31%
JAC Current Resource Measured &
Indicated
14,792 137 0.07 65,286 33
Prior
Resource
Measured &
Indicated
13,134 139 0.06 58,492 27
Variance (%) 13% -1% 7% 12% 20%
Fantasma Current Resource Measured &
Indicated
1,738 74 0.01 4,149 -
Prior
Resource
Measured &
Indicated
1,049 72 - 2,436 -
Variance (%) 66% 3% - 70% -
Laderas Current Resource Measured &
Indicated
1,520 15 0.66 726 32
Prior
Resource
Measured &
Indicated
806 17 0.67 428 17
Variance (%) 88% -10% -3% 70% 84%
Sombra Current Resource Measured &
Indicated
912 45 0.15 1,314 4
Prior
Resource
Measured &
Indicated
758 54 0.12 1,317 3
Variance (%) 20% -17% 18% 0% 42%
All deposits (tank leach only) Current Resource Measured &
Indicated
102,021 65 0.62 212,728 2,039
Prior
Resource
Measured &
Indicated
73,129 79 0.66 185,994 1,553
Variance (%) 40% -18% -6% 14% 31%

Notes to Mineral Comparison Table

  1. Key Assumptions in April 2026 MRE:
  1. Key Assumptions in July 2025 MRE:



Figure 2 - Diablillos Mineral Resource Estimate within Conceptual Open Pit

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/11792/296232_f6969a39f41eda29_002full.jpg

Heap Leach Mineral Resource Estimate

The updated MRE includes a significantly expanded heap leach component, representing a large inventory of lower-grade mineralization that was not previously fully captured within the block model. The increase in heap leach mineralization reflects a combination of:

A potential secondary heap leach processing circuit will be evaluated under a PEA and presented with the DFS results by the end of Q2. The heap leach project will be an expansion to the tank leach operation and will be evaluated based on potential construction after the tank leach circuit is operational. The heap leach operation has the potential to convert some of the open pit waste into payable mineralization and effectively lower the future strip ratio. The company intends to present the PEA within the same NI 43-101 Technical Report as the DFS.

Table 4 - Diablillos Mineral Resource Estimate (Heap Leach Material Only) - As of April 30, 2026.

Deposit
Category Tonnes
(000 t)
Ag
(g/t)
Au
(g/t)
Contained Ag
(k oz Ag)
Contained
Au
(k oz Au)
All deposits (Heap leach only) Current Resource Measured &
Indicated
129,960 8 0.12 34,854 503
Prior
Resource
Measured &
Indicated
30,774 13 0.16 12,649 162
Variance (%) 322% -38% -25% 176% 210%

Notes for July 2026 MRE (Heap Leach Material):

  1. Mineral Resources are not Mineral Reserves and have not demonstrated economic viability.
  2. The formula for calculating AgEq is as follows: Silver Eq Oz = Silver Oz + Gold Oz x (Gold Price/Silver Price) x (Gold Recovery/Silver Recovery).
  3. The Mineral Resource model was populated using Ordinary Kriging grade estimation within a three-dimensional block model and mineralized zones defined by wireframed solids, which are a combination of lithology and alteration domains. The 1m composite grades were capped where appropriate.
  4. The Mineral Resource is reported inside a conceptual Whittle open pit shell derived using US$ 34.50/oz Ag price, US $3,200/oz Au price, 86.6% process recovery for Au, and 80.9% process recovery for Ag, for the primary process tank leaching and 74.3% process recovery for Au, and 46.8% process recovery for Ag, for the secondary process heap leaching.
  5. Open pit optimization was constrained using a dual-process approach, with tank leaching as the primary process (total opex of US$32.30/t) and heap leaching as the secondary process (total opex of US$7.00/t).
  6. The MRE has been categorized in accordance with the CIM Definition Standards (CIM, 2014).
  7. A Net Value per block [NVB] calculation was used to constrain the Mineral Resource, determine the "Benefits = Income-Cost", where, Income = [(Au Selling Price (US$/oz) - Au Selling Cost (USD/Oz)) x (Au grade (g/t)/31.1035)) x Au Recovery (%)] + [(Ag Selling Price (US$/oz) - Ag Selling Cost (USD/Oz)) x (Ag grade (g/t)/31.1035)) x Ag Recovery (%)] and Cost = Mining Cost (US$/t) + Process Cost (US$/t) + Transport Cost (US$/t) + G&A Cost (US$/t) + [Royalty Cost (%) x Income].
  8. The Mineral Resource is sub-horizontal with sub-vertical feeders and a reasonable prospect for eventual economic extraction by open pit methods.
  9. In-situ bulk density was assigned to each model domain, according to samples averages for each lithology domain, separated by alteration zones and subset by oxidation.
  10. All tonnages reported are dry metric tonnes and ounces of contained gold are troy ounces.
  11. Mining recovery and dilution factors have not been applied to the Mineral Resource estimates.
  12. The Mineral Resource was estimated by Luis Rodrigo Peralta, B.Sc., FAusIMM CP (Geo), an INSA Consultora Managing Principal Geologist, and an Independent Qualified Person under NI 43-101.
  13. Mr. Peralta is not aware of any environmental, permitting, legal, title, taxation, socio-political, marketing, or other relevant issues that could materially affect the potential development of the Mineral Resource.
  14. All figures are rounded to reflect the relative accuracy of the estimates. Minor discrepancies may occur due to rounding to appropriate significant figures.

Significant Exploration Upside Remains

Diablillos continues to demonstrate strong potential for further Mineral Resource growth, both within and beyond the current footprint. Key target areas include:

The fully funded Phase VI drill program includes approximately 15,000 m of drilling, with results expected to support a future Mineral Resource update in early 2027.

Definitive Feasibility Study Update

The tank leach DFS remains on track for completion by the end of Q2 2026. Feasibility-level engineering has now been completed, and a new mine plan is being developed based on this MRE that will result in an updated Mineral Reserve estimate.

In parallel, the Company has commenced early-stage planning for engineering, procurement and construction activities, positioning Diablillos to advance efficiently toward a formal construction decision.

Mineral Resource Estimate Methodology

Supporting Technical Disclosure

QA/QC and Core Sampling Protocols

AbraSilver applies industry standard exploration methodologies and techniques, and all drill core samples are collected under the supervision of the Company's geologists in accordance with industry best practices. Drill core is transported from the drill platform to the logging facility where drill data is compared and verified with the core in the trays. Thereafter, it is logged, photographed, and split by diamond saw prior to being sampled. Samples are then bagged, and quality control materials are inserted at regular intervals at site; these include blanks and certified reference materials as well as duplicate core samples which are collected to assess sampling precision and reproducibility. Groups of samples are then placed in large bags which are sealed with numbered tags to maintain a chain-of-custody during the transport of the samples from the project site to the laboratory.

All samples are received by the ASA (Alex Stewart Argentina) preparation laboratory in Salta, where they are prepared, then the pulp sachet is directly dispatched to its facility in Mendoza, Argentina, where they are analyzed. All samples are analyzed using a multi-element technique consisting of a four-acid digestion followed by ICP/AES detection, and gold is analyzed by 50g Fire Assay with an AAS finish. Silver results greater than 100g/t are re-analyzed using four acid digestions with an ore grade AAS finish.

Qualified Persons and Technical Information

The site visit, review of various geological aspects including sampling techniques, drill core, logging, assay laboratory, secondary laboratory check samples and updated MRE estimate was done by Mr. Luis Rodrigo Peralta, B.Sc., FAusIMM CP (Geo). Mr. Peralta is an INSA Consultora Managing Principal Geologist, and an independent Qualified Person as defined by NI 43-101. Mr. Peralta has reviewed and approved the technical content of this news release.

The full Technical Report in respect of the updated MRE estimate is being prepared in accordance with NI 43-101 and will be available on SEDAR+ (www.sedarplus.ca) under the Company's issuer profile within 45 days from this news release.

About AbraSilver

AbraSilver is an advanced-stage exploration company focused on rapidly advancing its 100%-owned Diablillos silver-gold project in the mining-friendly Salta and Catamarca provinces of Argentina. The current Measured and Indicated Mineral Resource estimate for Diablillos (tank leach-only) consists of 102.0 Mt grading 65 g/t Ag and 0.62 g/t Au, containing approximately 213Moz of silver and 2.0Moz of gold, with significant further upside potential based on recent exploration drilling. The Company is led by an experienced management team and has long-term supportive shareholders. In addition, the Company has an earn-in option and joint venture agreement with Teck on the La Coipita project, located in the San Juan province of Argentina. AbraSilver is listed on the Toronto Stock Exchange under the symbol "ABRA" and in the U.S. on the OTCQX under the symbol "ABBRF."

For further information please visit the AbraSilver Resource website at www.abrasilver.com, our LinkedIn page at AbraSilver Resource Corp., and follow us on X at www.x.com/abrasilver

Alternatively please contact:

John Miniotis, President and CEO
info@abrasilver.com
Tel: +1 416-306-8334

Forward Looking Statements

This news release contains "forward-looking statements" and/or "forward-looking information" (collectively, "forward-looking statements") within the meaning of applicable securities legislation. All statements, other than statements of historical fact, are forward-looking statements. Generally, forward-looking statements can be identified by the use of forward-looking terminology such as "plans", "expect", "is expected", "in order to", "is focused on" (a future event), "estimates", "intends", "anticipates", "believes" or variations of such words and phrases or statements that certain actions, events or results "may", "could", "would", or the negative connotation thereof. In particular, statements regarding the Company's future operations, future exploration and development activities or other development plans constitute forward-looking statements. By their nature, statements referring to mineral reserves or mineral resources constitute forward-looking statements. Forward-looking statements in this news release include, but are not limited to statements with respect to the results (if any) of further exploration work to define and expand or upgrade mineral resources and reserves at the Project; the anticipated exploration, drilling, development, construction and other activities of the Company and the results of such activities, including the completion of the DFS on the proposed tank leach operation and an accompanying PEA of the additional heap leach option in Q2/2026 and an updated MRE in Q1/2027; the Mineral Resource estimates of the Project (and the assumptions underlying such estimates); the ability of exploration work (including drilling) to accurately predict mineralization; the completion and timing for the filing of the technical report; the ability to realize upon mineralization in a manner that is economic; and any other information herein that is not a historical fact.

The Company considers its assumptions to be reasonable based on information currently available but cautions the reader that these assumptions regarding future events, many of which are beyond the control of the Company, may ultimately prove to be incorrect since they are subject to risks and uncertainties that affect the Company, its properties and business. Such risks and uncertainties include, but are not limited to, changes in demand for and price of gold, silver and other commodities (such as fuel and electricity) and currencies; changes or disruptions in the securities markets; legislative, political or economic developments in Argentina; changes in any of the assumptions underlying the updated MRE; the need to obtain permits and comply with laws and regulations and other regulatory requirements; the possibility that actual results of work may differ from projections/expectations or may not realize the perceived potential of the Company's projects; risks of accidents, equipment breakdowns and labour disputes or other unanticipated difficulties or interruptions; the possibility of cost overruns or unanticipated expenses in development programs; operating or technical difficulties in connection with exploration, mining or development activities; the speculative nature of exploration and development, including the risks of diminishing quantities of grades of reserves and resources; and the risks involved in the exploration, development and mining business and the additional risks described in the Company's most recently filed Annual Information Form, annual and interim management's discussion and analysis and other disclosure documents which are available on SEDAR+ (www.sedarplus.ca) under the Company's issuer profile. The Company's anticipation of and success in managing the foregoing risks could cause actual results to differ materially from what is anticipated in such forward-looking statements. Although management of the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated or intended. The Company disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events or otherwise, except as required by applicable securities laws.

Neither the TSX nor its Regulation Services Provider (as that term is defined in the policies of the TSX) accepts responsibility for the adequacy or accuracy of this news release.

Appendix I - Total Consolidated Mineral Resource Estimate (Tank & Heap Leaching) April 30, 2026

Deposit Zone Category Tonnes
(000 t)
Ag
(g/t)
Au
(g/t)
AgEq
(g/t)
Contained Ag
(000 Oz Ag)
Contained Au
(000 Oz Ag)
Contained AgEq
(000 Oz Ag)
Oculto Oxides Measured 53,747 54 0.55 102 93,891 944 173,602
Indicated 146,634 16 0.32 44 75,326 1,503 194,188
Measured & 200,380 26 0.38 59 169,217 2,447 367,791
Indicated
Inferred 42,950 9 0.28 33 12,147 389 41,783
JAC Oxides Measured 12,765 119 0.07 125 48,774 27 51,104
Indicated 7,863 84 0.03 87 21,286 8 21,963
Measured & 20,628 106 0.05 110 70,060 36 73,067
Indicated
Inferred 1,561 79 0.01 80 3,967 1 4,005
Fantasma Oxides Measured - - - - - - -
Indicated 2,293 63 0.01 63 4,621 0 4,653
Measured & 2,293 63 0.01 63 4,149 0 4,176
Indicated
Inferred 416 66 0.01 66 881 0 889
Laderas Oxides Measured - - - - - - -
Indicated 5,678 9 0.27 32 1,583 50 5,409
Measured & 5,678 9 0.27 32 1,583 50 5,409
Indicated
Inferred 4,135 8 0.22 28 1,115 30 3,362
Sombra Oxides Measured - - - - - - -
Indicated 3,001 27 0.09 35 2,572 9 3,207
Measured & 3,001 27 0.09 35 2,572 9 3,207
Indicated
Inferred 284 32 0.01 33 297 0 300
Total Oxides Measured 66,512 67 0.45 105 142,665 971 224,706
Indicated 165,469 20 0.30 43 105,388 1,570 229,420
Measured & 231,981 33 0.34 61 248,053 2,542 454,127
Indicated
Inferred 49,347 12 0.26 32 18,406 420 50,340

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