Atico Continues to Extend the Ore Body at El Roble Mine in Colombia and Reports Multiple Higher-Grade Intercepts up to 18.6m of 7.65% Cu, 2.22 g/t Au, 9.0m of 8.44% Cu, 3.58 g/t Au and 5.7m of 8.48% Cu, 7.41 g/t Au

Atico expects continued drilling through 2027 to pursue further mineralization and a longer mine life.

Rhea-AI Summary

Atico Mining (ATCMF) reported results from 32 drill holes that extended mineralization at its El Roble copper-gold mine in Colombia. The 2026 program completed 1,689.3 meters of drilling in and around the historical mineralized body. Highlights included 18.6 meters grading 7.65% copper and 2.22 grams per tonne gold, 9 meters grading 8.44% copper and 3.58 grams per tonne gold, and 5.7 meters grading 8.48% copper and 7.41 grams per tonne gold.

Reported intervals ranged from 0.25 to 18.6 meters. Mineralization remains open at depth and along strike, meaning its limits have not been established in those directions. Atico expects drilling to continue through 2026 and 2027 to extend mineralization and increase mine life, and anticipates an updated reserves and resources statement by early 2027.

Positive

• Minor pointATDM-150 intersected 18.6 meters grading 7.65% copper and 2.22 g/t gold.
• Minor pointATDM-171 intersected 9 meters grading 8.44% copper and 3.58 g/t gold.
• Minor pointATDM-121 intersected 5.7 meters grading 8.48% copper and 7.41 g/t gold.
• Minor pointATDM-147 intersected 4.5 meters grading 16.13% copper and 1.44 g/t gold.
• Minor pointATDM-161 intersected 3.9 meters grading 4.44% copper and 16.46 g/t gold.

12 minor points

• Minor pointATDM-120 intersected 4.1 meters grading 6.17% copper and 13.4 g/t gold.
• Minor pointATDM-148 intersected 6.5 meters grading 3.77% copper and 9.49 g/t gold.
• Minor pointATDM-140 intersected 3.45 meters grading 11.7% copper and 2.55 g/t gold.
• Minor pointATDM-146 intersected 4.5 meters grading 9.91% copper and 1.95 g/t gold.
• Minor pointATDM-151 intersected 8.7 meters grading 7.58% copper and 1.63 g/t gold.
• Minor pointATDM-159 intersected 4.9 meters grading 7.95% copper and 4.48 g/t gold.
• Minor pointATDM-130 intersected 9.05 meters grading 6.36% copper and 1.84 g/t gold.
• Minor pointATDM-119 intersected 7.1 meters grading 3.21% copper and 7.63 g/t gold.
• Minor pointATDM-112 intersected 6.25 meters grading 7.65% copper and 1.72 g/t gold.
• Minor pointEl Roble mineralization remains open at depth and along strike, leaving further areas to test.
• Minor point. Forward-looking: it has not happened yet and may not happen.Atico expects drilling through 2026 and 2027, targeting further mineralization and increased mine life.
• Minor point. Forward-looking: it has not happened yet and may not happen.Atico anticipates an updated reserves and resources statement by early 2027.

Negative

• Minor pointTrue widths are estimated at 90%–95% of drill intercepts, reflecting uncertain local mineralization orientation.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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VANCOUVER, British Columbia, Oct. 28, 2026 (GLOBE NEWSWIRE) -- Atico Mining Corporation (TSX.V: ATY | OTCID: ATCMF) (“Atico” or the “Company”) is pleased to announce positive results from 32 drill holes completed in 2026 within an area of historical mining, successfully expanding the tonnage at the El Roble mine. The table below highlights some assay results in bold for drill core holes, which include 18.6m of 7.65% Cu, 2.22 g/t Au, 9.0m of 8.44% Cu, 3.58 g/t Au and 5.7m of 8.48% Cu, 7.41 g/t Au. Ore grade intercepts are reported over widths of 0.25 to 18.6 meters in areas with limited drilling with results highlighting the possibility of further extending the ore body with additional drill programs.

“Our ongoing drilling campaign at El Roble mine continues to deliver important results, intercepting new mineralization and successfully extending the boundaries of the historical massive sulfide zones,” said Fernando E. Ganoza, CEO. “These assay results reinforce our confidence that higher-grade copper and gold mineralization continues to extend beyond the historical zones. The deposit remains open at depth and along strike, confirming further potential both within and outside the previously defined mineralized shell. Drilling is expected to continue through 2026 and 2027, with the goal of further extending mineralization and increasing the mine life. We also anticipate issuing an updated reserves and resources statement for the El Roble mine by early next year, and remain encouraged by the results to date.”

El Roble Drilling Highlights Include:

Drill Hole	From (m)	To (m)	Interval (m)	Cu %	Au g/t
ATDM-112	90.85	97.1	6.25	7.65	1.72
ATDM-119	15.1	22.2	7.1	3.21	7.63
ATDM-120	17.6	21.7	4.1	6.17	13.4
ATDM-121	7.9	13.6	5.7	8.48	7.41
ATDM-130	73	82.05	9.05	6.36	1.84
ATDM-140	25.65	29.1	3.45	11.7	2.55
ATDM-146	17.3	21.8	4.5	9.91	1.95
ATDM-147	18.6	23.1	4.5	16.13	1.44
ATDM-148	17.6	24.1	6.5	3.77	9.49
ATDM-150	15.9	34.5	18.6	7.65	2.22
ATDM-151	27.9	36.6	8.7	7.58	1.63
ATDM-159	53.8	58.7	4.9	7.95	4.48
ATDM-161	55	58.9	3.9	4.44	16.46
ATDM-171	28.5	37.5	9	8.44	3.58

Exploration Drilling Program

The goal of the 2026 underground drilling program at the El Roble mine is to define zones of mineralization within the extent of the main historic massive sulphide body that were not exploited by previous operators, to expand the historically identified resource and explore for new massive sulfide bodies. The Company began this drill infill program to test the main mineralized body and the immediately adjacent area during the first quarter of 2023 and has continued the program during 2026 with 32 drill holes for a total of 1689.3 meters of drilling.

All intervals in Table 1 include only assays of greater than 1% Cu and very high-grade copper or gold sections within these intervals do not occur.

Table 1: Exploration Drilling Results with a 1% copper cutoff include

Drill Hole	From (m)	To (m)	Interval (m)	Cu %	Au g/t
ATDM-112	63.85	65.6	1.75	2.95	0.27
ATDM-112	66.7	69.8	3.1	4.7	0.61
ATDM-112	73.7	74.1	0.4	4.49	1.51
ATDM-112	76	76.6	0.6	2.41	0.57
ATDM-112	87.6	88.9	1.3	5.23	1.02
ATDM-112	90.85	97.1	6.25	7.65	1.72
ATDM-114	30	31.5	1.5	3.14	0.38
ATDM-115	64.25	64.55	0.3	3.98	0.46
ATDM-115	68.9	70.2	1.3	1.38	0.38
ATDM-115	71.4	72.4	1	6.45	0.65
ATDM-119	15.1	22.2	7.1	3.21	7.63
ATDM-120	17.6	21.7	4.1	6.17	13.4
ATDM-121	7.9	13.6	5.7	8.48	7.41
ATDM-121	14.3	16.3	2	4.33	5.35
ATDM-125	71.3	72.8	1.5	4.63	1.82
ATDM-125	74	79.2	5.2	3.75	0.46
ATDM-125	79.7	82.6	2.9	12.61	1.54
ATDM-125	84.5	85.9	1.4	4.11	1.63
ATDM-130	73	82.05	9.05	6.36	1.84
ATDM-132	32.3	32.8	0.5	1.88	4.97
ATDM-132	33.2	35.6	2.4	1.81	6.56
ATDM-136	65.7	71	5.3	5.8	0.36
ATDM-136	75.25	77.7	2.45	8.13	1.29
ATDM-139	28.8	29.6	0.8	5.58	0.72
ATDM-140	16.2	18.2	2	1.18	2.42
ATDM-140	25.65	29.1	3.45	11.7	2.55
ATDM-140	30.4	33	2.6	6.19	2.76
ATDM-141	24.9	25.15	0.25	1.81	4.33
ATDM-144	20.6	22.5	1.9	7.18	0.42
ATDM-144	26.2	27.7	1.5	4.29	1.08
ATDM-146	14.2	16.2	2	5.57	2.58
ATDM-146	17.3	21.8	4.5	9.91	1.95
ATDM-146	22.4	24.3	1.9	7.4	2.62
ATDM-147	13	16	3	3.54	4.97
ATDM-147	16.8	17.7	0.9	5.86	1.47
ATDM-147	18.6	23.1	4.5	16.13	1.44
ATDM-147	23.7	25.7	2	14.39	1.26
ATDM-147	28.2	29.5	1.3	16.1	1.08
ATDM-147	34.1	35.1	1	3.61	0.45
ATDM-148	16.1	16.9	0.8	4	6.4
ATDM-148	17.6	24.1	6.5	3.77	9.49
ATDM-148	24.8	30.8	6	5.84	2.38
ATDM-148	36.5	42.5	6	8.38	1.57
ATDM-149	78.8	79.45	0.65	7.01	1.03
ATDM-149	79.8	81.8	2	4.07	1.2
ATDM-149	84	85.5	1.5	2.88	2.59
ATDM-149	93.25	95.8	2.55	1.26	0.94
ATDM-150	15.9	34.5	18.6	7.65	2.22
ATDM-150	35.4	36.2	0.8	2.75	0.34
ATDM-150	36.9	41.4	4.5	5.69	1.17
ATDM-151	20.4	21	0.6	4.82	8.4
ATDM-151	22	26	4	4.67	4.35
ATDM-151	27.9	36.6	8.7	7.58	1.63
ATDM-152	46.3	47	0.7	4.55	6.58
ATDM-152	48.8	49.1	0.3	2.72	1.1
ATDM-154	49.1	51.5	2.4	1.77	4.06
ATDM-157	26.7	29.95	3.25	2.36	6.94
ATDM-157	31.05	32	0.95	4.11	2.77
ATDM-158	32.6	35.5	2.9	2.22	2.16
ATDM-159	46.4	48.4	2	1.3	1.27
ATDM-159	53.8	58.7	4.9	7.95	4.48
ATDM-161	53.45	54	0.55	1.92	9.83
ATDM-161	55	58.9	3.9	4.44	16.46
ATDM-161	74.25	78.2	3.95	5.47	4.76
ATDM-161	81.1	85	3.9	2.1	3.28
ATDM-162	19.55	21.35	1.8	7.08	1.54
ATDM-162	21.75	22.35	0.6	9.22	1.61
ATDM-163	46.65	47.9	1.25	2.79	4.9
ATDM-164	16	22	6	4.36	2.02
ATDM-166	50.3	51.8	1.5	4.62	0.29
ATDM-166	59.4	62	2.6	9.82	8.22
ATDM-171	28.5	37.5	9	8.44	3.58
ATDM-171	40	42	2	3.49	2.06

True widths are dependent on uncertainties in the local strike and dip of the mineralization and are estimated to be between 90% and 95% of the drill intercept.

Image 1: Mineralized shells based on historical massive and new bodies at the El Roble Mine with intercepts from the current drill program

QA/QC

Atico Mining adheres to strict Quality Assurance and Quality Control protocols. Blanks and certified reference standards are inserted in each sample batch of drill core that is sent to the lab for analyses. Duplicate samples are also inserted into the sample stream. Twelve drill holes are HQ diameter and core samples are split in half using a diamond saw with one half saved for reference and the other half submitted for analysis. Twenty drill holes are NQ diameter core and the entire core was submitted for analysis. The drill hole number with core size and sample status is shown in Table 2. All samples are shipped via secure transport to ALS sample preparation facility in Medellin, Colombia.

Analysis is carried out at ALS, Lima, Peru for copper, silver, zinc and lead utilizing 4-acid dissolution followed by ICP-AES, Code OG62. Silver over 100 g is analyzed by fire assay with gravimetric finish (Code GRA22) using WST-SIM. Gold analysis is carried out at ALS Vancouver, Canada. Analysis is by fire assay (50 g) with gravimetric finish (Code GRA22) using WST-SIM.

El Roble Mine

The El Roble mine is a higher grade, underground copper and gold mine with nominal processing plant capacity of 1,000 tonnes per day, located in the Department of Choco in Colombia. Its commercial product is a copper-gold concentrate.

Since obtaining control of the mine on November 22, 2013, Atico has upgraded the operation from a historical nominal capacity of 400 tonnes per day.

El Roble’s reserves estimate, with an effective date of March 12, 2024, includes Proven and Probable mineral reserves of 828 thousand tonnes averaging 2.49% Cu, 2.20 g/t Au and a life of mine until Q1-2027. A full NI 43-101 technical report is available on SEDAR+. For more information on the reserves estimate refer to SEDAR+ and on the Company’s website.

Mineralization is open at depth and along strike and the Company plans to further test the limits of the deposit. On the larger land package, the Company has identified a prospective stratigraphic contact between volcanic rocks and black and grey pelagic sediments and cherts that has been traced by Atico geologists for ten kilometers. This contact has been determined to be an important control on VMS mineralization on which Atico has identified numerous target areas prospective for VMS type mineralization occurrence, which is the focus of the current surface drill program at El Roble.

Qualified Person

Garth Graves, P. Geo.

Garth Graves, P. Geo., independent consultant geologist for Atico Mining Corporation and a qualified person in accordance with National Instrument 43-101 has reviewed and approved the technical information contained in this news release.

About Atico Mining Corporation

Atico is a growth-oriented Company, focused on exploring, developing and mining copper and gold projects in Latin America. The Company generates significant cash flow through the operation of the El Roble mine and is developing its high-grade La Plata VMS project in Ecuador. The Company is also pursuing additional acquisition of advanced stage opportunities. For more information, please visit www.aticomining.com.

ON BEHALF OF THE BOARD

Fernando E. Ganoza
CEO
Atico Mining Corporation

Trading symbols: TSX.V: ATY | OTCID: ATCMF

Investor Relations
Igor Dutina
Tel: +1.604.633.9022

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.

No securities regulatory authority has either approved or disapproved of the contents of this news release. The securities have not been, and will not be, registered under the United States Securities Act of 1933, as amended (the ‘‘U.S. Securities Act’’), or any state securities laws, and may not be offered or sold in the United States, or to, or for the account or benefit of, a "U.S. person" (as defined in Regulation S of the U.S. Securities Act) unless pursuant to an exemption therefrom. This press release is for information purposes only and does not constitute an offer to sell or a solicitation of an offer to buy any securities of the Company in any jurisdiction.

Cautionary Note Regarding Forward Looking Statements

This announcement includes certain “forward-looking statements” within the meaning of Canadian securities legislation. All statements, other than statements of historical fact, included herein, are forward-looking statements. Forward- looking statements involve various risks and uncertainties and are based on certain factors and assumptions. There can be no assurance that such statements will prove to be accurate, and actual results and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from the Company’s expectations include uncertainties relating to interpretation of drill results and the geology, continuity and grade of mineral deposits; uncertainty of estimates of capital and operating costs; the need to obtain additional financing to maintain its interest in and/or explore and develop the Company’s mineral projects; uncertainty of meeting anticipated program milestones for the Company’s mineral projects; and other risks and uncertainties disclosed under the heading “Risk Factors” in the AIF of the Company dated September 4, 2024 filed with the Canadian securities regulatory authorities on the SEDAR+ website at www.sedarplus.com

A photo accompanying this announcement is available at https://www.globenewswire.com/NewsRoom/AttachmentNg/d1c3c909-c701-4392-bc1b-052c5604128c

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What were Atico Mining's main El Roble drilling results?

Highlights included 18.6 meters grading 7.65% copper and 2.22 g/t gold in ATDM-150. ATDM-171 returned 9 meters grading 8.44% copper and 3.58 g/t gold, while ATDM-121 returned 5.7 meters grading 8.48% copper and 7.41 g/t gold.

When does Atico Mining expect an updated El Roble reserves and resources statement?

Atico anticipates an updated El Roble reserves and resources statement by early 2027. The company also expects drilling to continue through 2026 and 2027, with the goal of extending mineralization and increasing mine life.

What copper cutoff did Atico use for the El Roble drilling results?

The exploration results table uses a 1% copper cutoff, and its reported intervals include only assays greater than 1% copper. These intervals therefore represent selected mineralized sections rather than the entire lengths drilled.

Do Atico Mining's El Roble drill intercepts represent true widths?

True widths are estimated to be between 90% and 95% of the drill intercept. The estimates depend on uncertainties in the local strike and dip—the direction and inclination—of the mineralization.