AbraSilver Drilling at Diablillos Intersects 8.5 Metres at 13.81 g/t Gold at Oculto East

Rhea-AI Summary

AbraSilver (OTCQX: ABBRF) announced assay results from five Phase V drill holes at its wholly‑owned Diablillos project (Oculto East) on October 28, 2025. Highlights include a high‑grade intercept of 8.5 m at 13.81 g/t Au in DDH‑25‑077 and a very broad zone of 180 m at 0.65 g/t Au in DDH‑25‑076. Multiple other oxide intersections were reported, including 31.0 m at 0.59 g/t Au and 73.0 m at 0.55 g/t Au. Assays are uncut and undiluted; widths reported are drilled widths and true widths are unknown. Additional deeper assay results are pending before year‑end.

Positive

• 8.5 m at 13.81 g/t Au in DDH‑25‑077
• 180 m at 0.65 g/t Au continuous intercept in DDH‑25‑076
• Multiple broad oxide intervals: 31 m and 73 m at ~0.6 g/t Au

Negative

• Reported widths are drilled; true widths unknown
• Assays are uncut and undiluted, may overstate grades
• Deeper porphyry assay results are pending before year‑end

Separate Hole Intersects Broad Zone of 180 m Grading 0.65 g/t Gold

Toronto, Ontario--(Newsfile Corp. - October 28, 2025) - AbraSilver Resource Corp. (TSX: ABRA) (OTCQX: ABBRF) ("AbraSilver" or the "Company") is pleased to announce new assay results from five drill holes from the ongoing Phase V exploration program at its wholly-owned Diablillos project in Argentina (the "Project"). These results continue to expand oxide-hosted gold mineralization to the east of the Oculto deposit, extending the high-grade gold zone and highlighting the continued strong exploration upside potential across the Diablillos system.

Highlight Drill Results – Widths are reported as drilled; true widths are not yet known.

• At Oculto East, numerous broad zones of gold and silver mineralization were intercepted, including:
  • DDH 25-073: 10.0 metres ("m") grading 59 g/t silver (from 117 m downhole) & 20.0 m grading 0.66 g/t gold (223 m downhole)
  • DDH 25-074: 31.0 m grading 0.59 g/t gold (from 255 m)
  • DDH 25-075A: 73.0 m grading 0.55 g/t gold (from 277 m), including 13.5 m at 0.83 g/t gold & 16.5 m grading 0.75 g/t gold
  • DDH 25-076: 12 m grading 62 g/t silver (from 128 m downhole) & a very broad, well-mineralized intercept of 180.0 m grading 0.65 g/t gold (from 170 m), including 15.0 m at 1.36 g/t gold
  • DDH 25-077: A high-grade interval of 13.81 g/t gold over 8.5 m from 317 m, and a separate interval of 44.0 m at 0.65 g/t gold from 368 m

John Miniotis, President and CEO, commented, "Drilling at Oculto East continues to deliver impressive results with wide, high-grade gold intercepts. The continued expansion of this zone well beyond the current conceptual open pit demonstrates the strong growth potential of Diablillos and positions us to continue unlocking significant value through ongoing exploration and development."

Figure 1 – Plan View of Drill Results

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/11792/272103_6e58763c443ed887_001full.jpg

Dave O'Connor, Chief Geologist, commented, "Drilling at Oculto East continues to confirm broad, high-grade gold mineralization extending well beyond the eastern margin of the conceptual open pit. The consistency of these strong intercepts points to a large, continuous mineralized envelope with significant potential for further expansion."

Table 1 – Summary of Key Drill Intercepts

Intercepts greater than 25 gram-metres gold or 2,000 gram-metres silver shown in bolded text:

Drill Hole		Area	From (m)	To (m)	Type	Interval (m)	Ag g/t	Au g/t
DDH-25-073		Oculto East	117.0	127.0	Oxides	10.0	59.0	-
			133.0	139.0	Oxides	6.0	36.9	0.24
			223.0	243.0	Oxides	20.0	13.3	0.66
			256.0	266.0	Oxides	10.0	24.7	0.78
			313.5	315.5	Oxides	2.0	-	0.86
			327.5	330.0	Oxides	2.5	4.2	1.41
DDH-25-074		Oculto East	224.0	225.0	Oxides	1.0	-	1.30
			233.0	243.0	Oxides	10.0	-	0.61
			255.0	286.0	Oxides	31.0	-	0.59
DDH-25-075A		Oculto East	148.0	168.0	Oxides	20.0	3.5	0.40
			187.0	189.0	Oxides	2.0	3.5	1.05
			277.0	350.0	Oxides	73.0	3.3	0.55
		Including	286.0	299.5	Oxides	13.5	4.0	0.83
		Including	313.0	329.5	Oxides	16.5	2.6	0.75
DDH-25-076		Oculto East	121.0	124.0	Oxides	3.0	83.7	0.17
			128.0	140.0	Oxides	12.0	62.1	0.17
			150.0	156.0	Oxides	6.0	10.3	1.12
			161.0	162.0	Oxides	1.0	5.5	0.99
			170.0	350.0	Oxides	180.0	10.8	0.65
		Including	297.0	312.0	Oxides	15.0	25.3	1.36
DDH-25-077		Oculto East	317.0	337.0	Oxides	20.0	6.2	0.27
			337.0	345.5	Oxides	8.5	14.3	13.81
			368.0	412.0	Oxides	44.0	3.6	0.65
			425.0	428.0	Oxides	3.0	10.1	0.77
			435.0	450.0	Mixed	15.0	13.3	0.62
			446.5	448.0	Sulphides	1.5	8.9	2.81

 

Note: All results in this news release are rounded. Assays are uncut & undiluted. Widths are drilled widths, not true widths. True widths are unknown.

Additional Details on Drill Results – Oculto East

Several holes drilled at Oculto East continue to demonstrate broad, continuous intervals of oxide gold mineralization extending beyond the eastern margin of the current conceptual open pit. The stand-out intercept was returned in hole DDH 25-077 with a high-grade interval of 8.5 m grading 13.81 g/t gold and 14.3 g/t silver. As seen in Figure 2 below, this intercept occurs along the same mineralized trend as hole DDH 25-024, which previously returned 31.0 m grading 9.96 g/t gold and 16.2 g/t silver, highlighting the strong continuity of high-grade gold mineralization at Oculto East.

Additional assay results from nearby holes are pending, with drilling ongoing to further define the continuity and extent of this expanding high-grade gold zone within the larger mineralized system.

Figure 2 – Section Through Latest Drill Holes – at Oculto East Looking Northeast

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/11792/272103_6e58763c443ed887_002full.jpg

Note: Widths are drilled widths, not true widths. True widths are unknown.

Exploration Update

In parallel with the ongoing oxide-focused drilling, exploration is underway at the porphyry complex located approximately 4 kilometres northeast of Oculto. The Company has completed a deep drill hole at the Cerro Blanco target and four shallow holes at the Cerro Viejo target, with an additional deep drill hole underway at Cerro Viejo. These holes were designed to evaluate the potential for a large-scale mineralized system at depth. In addition, a deep drill hole is currently underway at Oculto East to test for potential porphyry-style mineralization beneath the high-grade gold zone, marking an important step toward assessing the deeper potential across the broader Diablillos system. All assay results for these deeper holes are expected to be received before year-end.

Collar Data

Hole Number	UTM Coordinates		Elevation	Azimuth	Dip	Depth (m)	Area
DDH 25-073	720644	7199602	4,317	180	-70	350	Oculto East
DDH 25-074	720926	7199724	4,362	180	-60	290	Oculto East
DDH 25-075A	721099	7199691	4,427	175	-70	350	Oculto East
DDH 25-076	721007	7199649	4,413	175	-60	350	Oculto East
DDH 25-077	720877	7199433	4,432	315	-75	450	Oculto East

 

About Diablillos

The Diablillos property is located within the Puna region of Argentina, in the southern part of Salta Province along the border with Catamarca Province, approximately 160 km southwest of the city of Salta and 375 km northwest of the city of Catamarca. AbraSilver acquired the property in 2016, which comprises 15 contiguous and overlapping mineral concessions with excellent year-round road access.

Exploration to date has outlined multiple occurrences of silver-gold oxide mineralization at Oculto, JAC, Laderas, and Fantasma, located within a 500 m to 1.5 km distance surrounding the Oculto/JAC epicentre. To date, over 150,000 metres have been drilled on the property, which continues to demonstrate the strong growth potential of shallow, oxide-hosted silver and gold resources. In addition, a large porphyry complex is centered approximately 4 km northeast of Oculto which includes outcropping porphyry intrusions within a major zone of alteration and associated gold rich epithermal mineralization.

Comparatively nearby examples of high sulphidation epithermal deposits include: La Coipa (Chile); Yanacocha (Peru); El Indio (Chile); Lagunas Nortes/Alto Chicama (Peru) Veladero (Argentina); and Filo del Sol (Argentina). The most recent Mineral Resource estimate for Diablillos is shown in Table 3:

Table 3 – Diablillos Mineral Resource Estimate – As of July 21, 2025

	Zone	Category	Tonnes (000 t)	Ag (g/t)	Au (g/t)	AgEq (g/t)	Contained Ag (000OzAg)	Contained Au (000 Oz Ag)	Contained AgEq (000 Oz Ag)
Tank Leach	Oxides	Measured	26,545	119	0.71	183	101,564	604	156,487
		Indicated	46,584	56	0.63	114	84,430	948	170,592
		Measured &	73,129	79	0.66	139	185,994	1,553	327,078
		Indicated
		Inferred	9,693	34	0.57	86	10,616	176	26,647
Heap Leach	Oxides	Measured	6,673	16	0.14	25	3,486	30	5,342
		Indicated	24,102	12	0.17	23	9,163	133	17,506
		Measured &	30,774	13	0.16	23	12,649	162	22,848
		Indicated
		Inferred	10,024	9	0.20	21	2,811	64	6,850
Total	Oxides	Measured	33,218	98	0.59	152	105,050	634	161,829
		Indicated	70,686	41	0.48	83	93,593	1,081	188,098
		Measured &	103,904	59	0.51	105	198,643	1,715	349,927
		Indicated
		Inferred	19,628	21	0.38	53	13,427	241	33,496

 

Footnotes for Tank Leach Resource:

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$ 27.50/oz Ag price, US $2,400/oz Au price, 83% process recovery for Ag, and 87% process recovery for Au.
5. The constraining open pit optimization parameters used were US $1.94/t mining cost, US $22.96/t processing cost, US $3.32/t G&A cost, and average 51-degree open pit slopes.
6. The MRE has been categorized in accordance with the CIM Definition Standards (CIM, 2014).
7. A Net Value per block [NVB] calculation was used to constrain the Mineral Resource, determine the "Benefits = Income-Cost", where, Income = [(Au Selling Price (US$/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 and tank leach processing methods.
9. In-situ bulk density 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), 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.

Footnotes for Heap Leach Resource:

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$ 27.50/oz Ag price, US $2,400/oz Au price, 80% process recovery for Ag, and 58% process recovery for Au.
5. The constraining open pit optimization parameters used and overall operational cost of US $11.31/t.
6. The MRE has been categorized in accordance with the CIM Definition Standards (CIM, 2014).
7. A Net Value per block [NVB] calculation was used to constrain the Mineral Resource, determine the "Benefits = Income-Cost", where, Income = [(Au Selling Price (US$/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. In-situ bulk density were assigned to each model domain, according to samples averages for each lithology domain, separated by alteration zones and subset by oxidation.
9. All tonnages reported are dry metric tonnes and ounces of contained gold are troy ounces.
10. Mining recovery and dilution factors have not been applied to the Mineral Resource estimates.
11. The Mineral Resource was estimated by Mr. Peralta, B.Sc., FAusIMM CP (Geo), Independent Qualified Person under NI 43-101.
12. 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.
13. All figures are rounded to reflect the relative accuracy of the estimates. Minor discrepancies may occur due to rounding to appropriate significant figures.

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 in order to assess sampling precision and reproducibility. Groups of samples are then placed in large bags which are sealed with numbered tags in order 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 digestion with an ore grade AAS finish.

Qualified Persons

David O'Connor P.Geo., Chief Geologist for AbraSilver, is the Qualified Person as defined by National Instrument 43-101 Standards of Disclosure for Mineral Projects, and he has reviewed and approved the scientific and technical information in 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 province of Argentina. The current Measured and Indicated Mineral Resource estimate for Diablillos (tank leach-only) consists of 73.1 Mt grading 79 g/t Ag and 0.66 g/t Au, containing approximately 186Moz silver and 1.6Moz 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

Cautionary Statements

This news release includes certain "forward-looking statements" under applicable Canadian securities legislation. Forward-looking statements are necessarily based upon a number of estimates and assumptions that, while considered reasonable, are subject to known and unknown risks, uncertainties, and other factors which may cause the actual results and future events to differ materially from those expressed or implied by such forward-looking statements. All statements that address future plans, activities, events or developments that the Company believes, expects or anticipates will or may occur are forward-looking information. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. When considering this forward-looking information, readers should keep in mind the risk factors and other cautionary statements in the Company's disclosure documents filed with the applicable Canadian securities regulatory authorities on SEDAR+ at www.sedarplus.ca. The risk factors and other factors noted in the disclosure documents could cause actual events or results to differ materially from those described in any forward-looking information. 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 law.

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.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/272103

FAQ

What did AbraSilver (ABBRF) announce on October 28, 2025 about Diablillos drilling?

AbraSilver reported five Phase V drill holes at Oculto East, including 8.5 m at 13.81 g/t Au and 180 m at 0.65 g/t Au.

Which drill hole returned the high‑grade 13.81 g/t Au intercept at Diablillos (ABBRF)?

Hole DDH‑25‑077 returned 8.5 m at 13.81 g/t Au from 337.0–345.5 m (drilled width).

How extensive was the broad gold zone reported by AbraSilver at Oculto East (ABBRF)?

Hole DDH‑25‑076 intersected a broad zone of 180 m at 0.65 g/t Au from 170.0–350.0 m (drilled width).

Are the reported drill widths at Diablillos true widths for AbraSilver (ABBRF)?

No; the company reported drilled widths and stated that true widths are unknown.

Will AbraSilver (ABBRF) release more assay results from Diablillos in 2025?

Yes; the company expects assay results for deeper porphyry‑target holes before year‑end 2025.

Were AbraSilver's (ABBRF) assay results at Diablillos cut or diluted?

The press release states assays are uncut and undiluted.