Orosur Mining Announces Anza Activity Accelerating

• Commencement of drilling at El Cedro
• Increase in Project size
• Further drill results from Pepas West and APTA
• Auger drilling at Pepas West

London, United Kingdom–(Newsfile Corp. – September 2, 2026) – Orosur Mining Inc. (TSXV: OMI) (AIM: OMI) (“Orosur” or the “Company“), 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 roughly 530km², within the Mid-Cauca gold belt, west of Medellín.

These titles and applications are owned 100% by two Colombian companies, Minera Anzá, and Minera Monte Aguila, both wholly owned subsidiaries of the Company.

Since acquiring 100% control of the Project, the Company has focused its attention on three prospects:

• Pepas – a shallow, high-grade deposit of gold mineralisation for which the Company has calculated a Mineral Resource Estimate (“MRE”), announced February 10^th 2026.
• APTA – a high-grade deposit of gold mineralisation that has to date seen approximately 40,000m of drilling since 2012, with drilling ongoing.
• El Cedro – a cluster of gold/copper porphyry intrusions in the south of the Project area at which drilling has just commenced.

Figure 1. Anzá Project

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El Cedro
The El Cedro prospect lies to the south of the same integrated licence that hosts both Pepas and APTA and is roughly 4km south of the APTA base camp.

Work on the area began some years before Orosur’s tenure, when Anglo American undertook reconnaissance mapping and sampling, identifying a highly prospective gold/copper porphyry system. An extensive area of anomalous soil geochemistry was delineated, as well as channel samples and rock chip samples with assays up to 10g/t Au and 2% Cu.

Little work was then undertaken until late 2021, when the Company’s previous JV partner MMA re-entered the area to carry out mapping, sampling and ground geophysics that largely confirmed Anglo American’s previous work and mapped several large dioritic intrusions and associated epithermal systems.

Post resumption of control of the Project, the Company undertook larger scale surface geochemical surveys during 2025 and early 2026, focussing on identifying structures and epithermal features proximal to the intrusions that could have the potential for higher grade metal accumulations.

Following an extensive period of permitting, socialisation and logistical planning, the first drilling campaign ever undertaken at El Cedro, began in late August 2026, initially targeting the eastern flank of the northern intrusion and the bounding structures and veins.

Figure 2. El Cedro location

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Drilling has only just begun, however a porphyry intrusion was immediately intersected, demonstrating attractive stockwork veining, silicification and potassic alternation. This first hole, CED001, is planned to reach a depth of 500m which is expected to take roughly five weeks to complete.

Figure 3. El Cedro core

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Project Size
Several new licence applications have recently been submitted, taking the total under application to 360km2. When combined with 170km2 of granted titles, the total Project area is now approximately 530km2.

Several of these new applications lie within forest reserve, or along the banks of the Cauca River and have been made for strategic reasons including to secure the Company’s position along the main access road.

Pepas West
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 maiden MRE for the Pepas gold deposit on February 10^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 and ounces added to inventory.

The Company achieved immediate success with a new zone of shallow mineralisation being identified roughly 100m to the west of Pepas – with first results announced on April 14^th, 2026.

Latest drilling at Pepas West (PEP106 and PEP107) have continued to define this zone with the picture now emerging of a surficial, heavily oxidised and possibly remobilised zone of medium grade mineralisation.

Hole Number	From (m)	To (m)	Interval (m)	Au (g/t)
PEP106	0	19.45	19.45	1.02
including	0	2.25	2.25	3.11
Including	11.1	12.2	1.1	3.09
PEP107	0	7.6	7.6	0.47
MAP108	134.8	213.75	78.95	0.38

 

Table 1. Latest drill Intercepts, Pepas West and APTA

Figure 4. Plan of holes, Pepas West

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Figure 5. Section, PEP106, PEP107

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Figure 6. Long Section, Pepas West

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The Company is of the view that Pepas West is worthy of follow up, however the geometry of the zone (surficial, thin and broad) would likely require a large number of shallow holes, a situation that is not well suited to traditional diamond drilling as too much time would be lost in rig moves. As a result, the diamond rig that has been at Pepas since late 2024, has been relocated to other prospects in the immediate vicinity while geological teams trial the application of an auger system to rapidly take samples of unconsolidated material down to a depth of roughly 10m.

A trial sampling program has been designed (Figure 7.) the results of which, when completed, will be assessed to determine if this methodology has the potential to move Pepas to Resource status.

Figure 7. Auger trial plan

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In addition, subject to results, the auger system may then be employed on a wider scale around Pepas to explore for similar shallow mineralisation that may perhaps be hidden beneath a thin veneer of barren transported cover.

APTA
The APTA prospect in the centre of the Project area has over 40,000m of drilling by various companies since 2012. This work has identified a substantial epithermal gold system.

The current drill plan at APTA is designed to better understand the geological controls upon the previously defined high-grade mineralisation that may then assist in planning a future resource drill out program if results warrant.

The latest hole, MAP108, was drilled off section from the previous hole and intersected a broad interval of low-grade mineralisation and has provided valuable insight into the delineating structures that control higher grades.

Figure 8. APTA Plan

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Drilling is currently focused on understanding the shallower reaches of the APTA deposit which have thus far seen little further exploration.

Figure 9. APTA drill section

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Orosur CEO Brad George commented:
“The Anza project is now ramping up with three rigs running, one at each of Pepas, APTA and El Cedro and planned to remain for some time. More prospects are also being advanced to the drill stage, demonstrating the extraordinary potential of this licence holding.”

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
PEP-084	403267	704913	972	-50	125
PEP-085	403267	704913	972	-50	310
PEP-086	403272	704910	979	-55	310
PEP-087	403262	704941	977	-50	260
PEP-088	403252	704946	979	-50	202
PEP-089	403252	704946	979	-50	202
PEP-090	403238	704980	976	-45	200
PEP-091	403390	704583	959	-45	110
PEP-092	403390	704583	959	-50	270
PEP-093	403351	704530	946	-45	123
PEP-094	403351	704530	946	-45	30
PEP-095	403215	705006	984	-55	205
PEP-096	403215	705006	984	-45	245
PEP-097	403215	705006	985	-50	178
PEP-098	403210	704940	965	-45	037
PEP-099	403210	704940	965	-62	037
PEP-100	403210	704940	965	-45	082
PEP-101	403274	704916	973	-55	035
PEP-102	403343	704863	985	-60	188
PEP-103	403343	704863	985	-50	08
PEP-104	403347	704897	998	-50	220
PEP-105	403347	704897	998	-75	040
PEP-106	403325	704908	992	-50	220
PEP-107	403325	704908	992	-75	220
PEP-108	403842	704863	982	-55	352
PEP-109

 

Drill Hole Details – APTA prospect *

Hole ID	Easting (m)	Northing (m)	Elevation asl (m)	Dip (°)	Azimuth (°)
MAP-072	400088	694745	1075	-55	293
MAP-073	400018	694503	1097	-58	295
MAP-074	399981	694684	1110	-58	295
MAP-075	400168	694723	1024	-55	295
MAP-076	400019	694527	1107	-50	295
MAP-077	400168	694723	1024	-69	295
MAP-078	399917	694719	1112	-50	295
MAP-079	399995	693976	960	-55	295
MAP-080	400231	694580	966	-55	295
MAP-081	400045	693950	920	-55	295
MAP-082	400176	694797	1020	-50	296
MAP-083	400176	694797	1020	-60	310
MAP-084	400045	693950	920	-57	321
MAP-085	400167	694552	1000	-46	247
MAP-086	400067	694360	1068	-54	295
MAP-087	400027	694168	988	-54	290
MAP-088	400168	694723	1024	-55	341
MAP-089	400067	694360	1068	-59	317
MAP-090	400041	694630	1059	-56	296
MAP-091	400060	694715	1089	-50	295
MAP-092	399420	695235	1162	-50	138
MAP-093	400055	694203	1006	-59	290
MAP-094	399954	694347	1031	-64	303
MAP-095	399722	695252	1113	-50	135
MAP-096	399759	694632	1082	-57	127
MAP-097	400054	694472	1087	-71	311
MAP-098	399794	694730	1149	-65	130
MAP-099	399098	695129	1157	-50	250
MAP-100	400096	694431	1051	-59	283
MAP-101	400286	694890	967	-50	331
MAP-102	400095	694426	990	-61.5	303.5
MAP-103	399793	694730	1162	-65.5	123.3
MAP-104	399982	694294	1015	-60	297
MAP-105	399793	694730	1162	-63.8	113.3
MAP-106A	399758	694913	1142	-49	120
MAP-107	399808	694864	1128	-60	109
MAP108	399922	694779	1098	-76	298

 

*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 and MAP-106 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

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 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.

Source: https://www.newsfilecorp.com/release/312424/Orosur-Mining-Announces-Anza-Activity-Accelerating