New mineralised zone discovered near Pepas

Orosur Mining Inc

14 April 2026

 

New mineralised zone discovered near Pepas

·    Drilling 100m west of Pepas intersects significant gold mineralisation:

o PEP082, 26.4m @ 2.85g/t Au from 5.3m.

o PEP083, 14.45m @ 8.27g/t Au from surface.

·    Mineralised material visually similar to Pepas with evidence of the same mineralising events.

·    Orientation drilling of this new zone underway.

·    Drilling at APTA commenced.

·    Airborne magnetic survey commenced.

London, April 14th, 2026. Orosur Mining Inc. ("Orosur" or the "Company") (TSXV/AIM:OMI), is pleased to announce an update on the progress of exploration activities at the Company's exploration project at Anzá in Colombia ("Anzá" or the "Project").

Anzá - Colombia

The Anzá Project in Colombia comprises a number of granted exploration titles and applications totalling roughly 330km², within the Mid-Cauca gold belt, west of the city of Medellín.

These titles and applications are owned by two Colombian companies, Minera Anzá, and Minera Monte Aguila, both wholly owned subsidiaries of the Company. The latter of these was acquired by Orosur in November 2024 from the Company's previous JV partners, Newmont Mining and Agnico Eagle Mines. Orosur thus owns 100% of the Anzá Project.

Since acquiring 100% control, the Company has focussed its attention on three prospects:

·    Pepas - a shallow, high-grade ore body of gold mineralisation for which the Company has calculated a Mineral Resource Estimate ("MRE"), announced February 10^th 2026.

·    APTA - a high-grade body of gold mineralisation that has to date seen over 38,000m of historical drilling, and at which drilling has recently recommenced. 

·    El Cedro - a cluster of gold porphyry intrusions in the south of the Project area that are currently subject to mapping and sampling programs, with a view to potentially being drilled later in H1 2026.

Figure 1. Anzá Project

Pepas

The Company's primary focus since reassuming control of the Project in late 2024, was to explore the immediate area of Pepas, ultimately leading to the publication of a Mineral Resource Estimate ("MRE") for the Pepas gold deposit on February 10^th  2026.  

This MRE was based upon drilling undertaken by the Company and its previous JV partner from 2022 to late 2025. Results from the final hole included in the MRE, PEP074, were announced on January 8^th, 2026.

Following completion of the MRE drillout in late 2025, the Company then embarked on a semi-regional drilling program around the Pepas deposit. The objective of this drilling program was to better understand the larger scale litho-structural controls that led to formation of the Pepas deposit, such that, in combination with additional mapping and sampling in the wider region, vectors toward additional mineralisation might be developed.

A number of holes (PEP075 to PEP081) were drilled to the NW of Pepas as several long sections (Figure 2.) to assist in developing an understanding of the macro scale structural setting within which the Pepas ore body was hosted. This included mapping the strike extensions of the Tesorito faults that bound Pepas, and to better understand the interaction between various source intrusions and associated volcanoclastic host rocks.

This program has added substantially to the Company's wider scale understanding of the area, intersecting several major structures of interest, but with generally low grades of gold mineralisation. This program was then originally planned to be continued on the SE side of Pepas to build a structural picture over the entire Pepas trend. This SE drilling program will however require some additional surface mapping and development of access tracks before it can commence.

In the meantime, following these NE sections, hole PEP082 was drilled to follow up drill intersections from two previous holes in early 2025. 

Holes PEP023 and PEP024 (Figure 3.) were drilled in January/February 2025 to test anomalous channel samples and surface silicification some 100m west of the main Pepas zone. Assay results from these holes were announced on March 10^th, 2025, and returned moderate gold intersections of 15m @ 1.7g/t Au and 6.35m @ 1.99g/t Au respectively. However, as grades and thickness of mineralisation at Pepas were so compelling, the Company took the decision to focus on moving Pepas to an MRE as quickly, with a plan to follow up this western area at a later date.

PEP082 was drilled to cut the mineralised zone from PEP023 from a different orientation and returned a substantial intersection of 26.4m @ 2.85g/t Au from near surface, but importantly, demonstrating the same lithologies and two same mineralising events that form the basis of the Pepas deposit, suggesting the two occurrences are likely related.

Subsequently, PEP083 was collared to the south and drilling back to toward PEP083 as the first phase of orientation drilling to better understand the form and trend of this mineralised zone.  PEP083 returned a shorter, but very high-grade gold intersection from surface of 14.45m @ 8.27g/t Au, again showing the same two mineralising events.

This orientation drilling will continue for a short period of time before any step out drilling is considered. To that end, holes PEP084 to PEP086 have just been completed, with similar mineralised lithologies being visually identified.

Hole Number	From (m)	To (m)	Interval (m)	Au (g/t)
PEP075	56.95	73.4	16.45	0.14
PEP076	No significant results
PEP077	5	10	5	0.23
PEP078	No significant results
PEP079	11.05	25.2	14.15	0.41
	34.75	45.2	10.45	0.29
PEP080	69.45	76.4	6.95	0.12
PEP081	211.65	229.9	18.25	0.28
PEP082	5.3	31.7	26.40	2.85
including	19.3	27	7.70	5.07
PEP083	0	14.45	14.45	8.27
including	0.95	3.5	2.55	42.7

Table 1. Latest drill Intercepts, Pepas Prospect

Figure 2.  Plan of holes

Figure 3. Section PEP082

Figure 4. Section PEP083

APTA

The APTA prospect in the centre of the Project area has seen almost 39,000m of drilling by various companies since 2012. This work has identified a substantial epithermal gold system.

The last phase of drilling was undertaken by the Company's previous JV partner, MMA, from late 2020 through early 2022, at which time the abatement of Covid related operational restrictions allowed MMA field crews to begin to explore the wider Anzá project area. Results from the final holes of this phase of work were announced on 27^th June 2022.

Following work done by the Company and as noted in the recently published NI43-101 report for the Anzá Project (released March 26^th 2026), APTA is deemed to be of a similar geological style to Pepas, albeit somewhat deeper and in a different host rock.

The Company has undertaken its own geological studies and has developed targeting concepts to explain the emplacement of APTA and to open areas of untested exploration potential.  A program of several holes is planned to test these concepts, the first of which, MAP106 commenced last week.    This hole has a planned depth of 400m.

Airborne Magnetic Survey

Most of the Anzá Project area was covered by a helicopter borne magnetic/radiometric survey from 2012.  However, while these data are of use, the Company considers the survey specifications and data quality to be sub-optimal, a view confirmed by comparison with a more detailed drone mounted magnetic survey undertaken by the Company over Pepas in early 2025.

A larger drone mounted magnetic survey has just commenced over the southern half of the Project area, covering the El Cedro porphyry cluster and the APTA deposit. Results are expected in the near term.  It is anticipated that the results of this work will assist in drill targeting for both APTA and the El Cedro porphyry system which are currently being mapped and sampled.

Orosur CEO Brad George commented:

"We have always considered Pepas to be a small part of a larger system but held back on wider exploration until the MRE was complete.  It is encouraging to have now identified extensions or repetitions of this mineralised system that will form the basis of more detailed exploration.  This drilling, in conjunction with the new rig at APTA and potential drilling at El Cedro in coming months, finally sees the Anzá project being explored to its potential."

For further information, visit www.orosur.ca, follow on X @orosurm or please contact:

Orosur Mining Inc

Louis Castro, Chairman,

Brad George, CEO

[e-mail]

Tel: [phone]

SP Angel Corporate Finance LLP - Nomad & Joint Broker

Caroline Rowe / Jen Clarke / Devik Mehta

Tel: [phone]

Turner Pope Investments (TPI) Ltd - Joint Broker

Andy Thacker/Guy McDougall
Tel: [phone]

Flagstaff Communications and Investor Communications

Tim Thompson
Alison Allfrey
Fergus Mellon

[e-mail]

Tel: [phone]

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) No. 596/2014 ('MAR') which has been incorporated into UK law by the European Union (Withdrawal) Act 2018. Upon the publication of this announcement via Regulatory Information Service ('RIS'), this inside information is now considered to be in the public domain.

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 release.

Drill Hole Details - Pepas prospect 2022/2026 Programme*

Hole ID	Easting (m)	Northing (m)	Elevation asl (m)	Dip (°)	Azimuth (°)
PEP-001	403384	705000	1001	-50	150
PEP-002	403384	705000	1001	-60	290
PEP-003	403240	705142	1001	-49.60	95.2
PEP-004	403508	705671	838	-59.8	99.8
PEP-005	403373	704990	1008	-49.8	94.6
PEP-007	403374	704990	1008	-69.9	170
PEP-008	403232	704803	971	-50	60
PEP-009	403032	705057	1055	-50	80
PEP-010	403375	705106	982	-50.31	190.4
PEP-011	403573	704939	1001	-50.3	255
PEP-012	403415	704890	997	-56	352
PEP-013	403413	704887	997	-50	43
PEP-014	403400	704910	1007	-50	43
PEP-015	403375	704938	1017	-50	43
PEP-016	403326	704912	999	-50	43
PEP-017	403365	704848	976	-40	47
PEP-018	403345	704851	977	-45	43
PEP-019	403446	704890	991	-45	43
PEP-020	403446	704890	991	-75	43
PEP-021	403424	704935	1012	-62	223
PEP-022	403424	704935	1012	-42	223
PEP-023	403245	704927	969	-50	43
PEP-024	403245	704927	969	-78	43
PEP-025	403369	704888	1001	-45	43
PEP-026	403339	704955	1008	-63	50
PEP-027	403468	704909	1003	-46	228
PEP-028	403398	704957	1012	-58	223
PEP-029	403311	705018	1011	-50	50
PEP-030	403311	705018	1011	-50	000
PEP-031B	403486	704901	998	-52	220
PEP-032	403431	704861	982	-60	15
PEP-033	403431	704861	982	-65	100
PEP-034	403431	704861	982	-45	315
PEP-035	403369	704882	996	-45	223
PEP-036	403311	705152	989	-45	30
PEP-037	403354	705227	958	-50	210
PEP-038	403332	705219	967	-45	128
PEP-039	403411	704798	957	-45	73
PEP-040	403369	704882	995	-80	212
PEP-041	403373	704936	1008	-50	3
PEP-042	403396	705038	716	-50	82
PEP-043	403298	704942	981	-50	43
PEP-044	403402	704948	1011	-62	33
PEP-045	403406	704949	1011	-60	223
PEP-046	403420	704933	1007	-53	43
PEP-047	403414	704927	1008	-74	223
PEP-048	403448	704922	1005	-54	043
PEP-049	403447	704920	1005	-55	223
PEP-050	403459	704905	1003	-45	43
PEP-051	403391	704928	1011	-61	43
PEP-052	403391	704928	1011	-87	43
PEP-053	403391	704929	1012	-60	223
PEP-054	403380	704954	1011	-52	43
PEP-055	403380	704954	1011	-86	223
PEP-056	403371	704970	1012	-61	43
PEP-057	403371	704970	1012	-71	223
PEP-058	403371	704970	1012	-85	223
PEP-059	403384	704976	1007	-59	43
PEP-060	403372	704908	1005	-55	43
PEP-061	403361	704988	1010	-80	223
PEP-062	403361	704988	1010	-61	43
PEP-063	403345	705005	1009	-50	80
PEP-064	403356	704923	1005	-51	43
PEP-065	403359	704949	1008	-59	43
PEP-065B	403359	704949	1008	-50	43
PEP-066	403423	704938	1009	-64	223
PEP-067	403400	704870	990	-53	43
PEP-068	403342	704989	1010	-56	43
PEP-069	403342	704987	1010	-80	218
PEP-070	403260	705071	1013	-50	30
PEP-071	403333	705005	1009	-51	90
PEP-072B	403435	704879	989	-70	43
PEP-073	403423	704917	1006	-50	307
PEP-074	403423	704917	1006	-60	127
PEP-075	403240	705267	946	-50	221
PEP-076	403240	705267	946	-60	042
PEP-077	403304	705228	959	-60	042
PEP-078	403304	705228	959	-60	222
PEP-079	403304	705228	959	-50	120
PEP-080	403093	705100	1026	-50	042
PEP-081	403215	705006	984	-55	032
PEP-082	403261	704941	977	-58	190
PEP-083	403267	704913	972	-45	342

*Coordinates WGS84, UTM Zone 18

About Orosur Mining Inc.

Orosur Mining Inc. (TSXV: OMI; AIM: OMI) is a minerals explorer and developer currently operating in Colombia and Argentina.

Qualified Persons Statement

The information in this news release was compiled, reviewed, verified and approved by Mr. Brad George, BSc Hons (Geology and Geophysics), MBA, Member of the Australian Institute of Geoscientists (MAIG), CEO of Orosur Mining Inc. and a qualified person as defined by National Instrument 43-101.

Orosur Mining Inc. staff follow standard operating and quality assurance procedures to ensure that sampling techniques and sample results meet international reporting standards.

Drill core is split in half over widths that vary between 0.3m and 2m, depending upon the geological domain. One half is kept on site in the Minera Anzá core storage facility in the case of the Anza Project, or on site in temporary racks in the case of the El Pantano Project, with the other sent for assay.

Industry standard QAQC protocols are put in place with approximately 10% of total submitted samples being blanks, repeats or Certified Reference Materials (CRMs).

Samples for holes PEP-001 to PEP-011 were sent to the Medellin preparation facility of ALS Colombia Ltd, and then to the ISO 9001 certified ALS Chemex laboratory in Lima, Peru.

Samples from PEP-012 onwards are sent to Medellin laboratory of Actlabs for preparation and fire assay, with some sample then sent to the Canadian Actlabs facility for multi element assay

Samples from the EL Pantano project are sent to the preparation facility and fire assay laboratory of Alex Stewart Laboratories in Perito Moreno to be assayed for gold.  Pulps are then sent to the larger Alex Stewart facility in Mendoza for multi-element analysis.

30 gram nominal weight samples are then subject to fire assay and AAS analysis for gold with gravimetric re-finish for overlimit assays of >5 g/t.  ICP-MS Ultra-Trace level multi-element four-acid digest analyses may also undertaken for such elements as silver, copper, lead and zinc, etc.

Gold intersections are reported using a lower cut-off of 0.3g/t Au over 3m.

Intersections are quoted as downhole thicknesses.  True thicknesses are unknown.

Forward Looking Statements

All statements, other than statements of historical fact, contained in this news release constitute "forward looking statements" within the meaning of applicable securities laws, including but not limited to the "safe harbour" provisions of the United States Private Securities Litigation Reform Act of 1995 and are based on expectations estimates and projections as of the date of this news release.

Forward-looking statements include, without limitation, the continuing focus on the Pepas prospect, the exploration plans in Colombia and in Argentina and the funding of those plans, and other events or conditions that may occur in the future. There can be no assurance that such statements will prove to be accurate. Actual results and future events could differ materially from those anticipated in such forward-looking statements. Such statements are subject to significant risks and uncertainties including, but not limited to, those described in the Section "Risks Factors" of the Company's MD&A for the year ended May 31, 2025. The Company's continuance as a going concern is dependent upon its ability to obtain adequate financing. This material uncertainty may cast significant doubt upon the Company's ability to realize its assets and discharge its liabilities in the normal course of business and accordingly the appropriateness of the use of accounting principles applicable to a going concern. The Company disclaims any intention or obligation to update or revise any forward-looking statements whether as a result of new information, future events and such forward-looking statements, except to the extent required by applicable law.

 

END