REG - Orosur Mining Inc - Operational Update Exploration Footprint Expanding

Orosur MiningAnnouncement

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RNS Number : 4060F  Orosur Mining Inc  30 October 2025

 

 

 

Orosur Mining Inc - Operational Update.  Exploration Footprint Expanding

 

 

·    Assays for three holes from the Pepas MRE infill and metallurgical
program include:

o PEP065 - 33.3m @ 2.84g/t Au

o PEP065B - 33.8m @ 2.79g/t Au

o PEP066 (met hole) - 112m @ 5.25g/t Au from surface

·    Resource consultants plan to be on site next week to begin the MRE
process.

·    Soil geochemistry completed at El Cedro, high grade potential
confirmed.

·    Second Porphyry identified at El Cedro - to be examined in future
programs, with a view to drilling early in 2026.

·    Airborne magnetic/radiometric survey planned over area.

·    Drill rig arrives at the El Pantano Project Argentina to commence
first drill program.

 

London, October 30th, 2025. 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 gold exploration projects at Anzá in
Colombia ("Anzá) and El Pantano in Argentina.

 

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 Medellin.

 

These titles and applications are owned by two Colombia companies, Minera
Anzá, and Minera Monte Aguila, both of which are wholly owned subsidiaries of
the Company. The latter of these companies 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 body of gold mineralisation that the
Company is endeavouring to move to an initial Mineral Resource Estimate in the
near term.

·    APTA - a high-grade body of gold mineralisation that has to date seen
38,000m of drilling, but is not yet sufficiently understood geologically to
allow a MRE to be calculated.  The Company plans to undertake additional
drilling at APTA in late 2025 with the objective of advancing it toward an MRE
as quickly as possible.

·    El Cedro - a large gold porphyry system in the south of the Anza
Project area. The Company has just completed a large sampling program and
plans to undertake a maiden drill program here in early 2026.

 

 

 

 

Figure 1. Anzá Project

 

 

 

Pepas

As announced on 14(th) July 2025, the Company took the formal decision to
commence infill drilling at its Pepas gold prospect at Anzá, with the
objective of moving Pepas to a NI43-101 compliant Mineral Resource Estimate
(MRE) by the end of the year.

 

Drilling progress has recently slowed largely due to issues related to broken
ground in hole PEP065 and the need to reconfigure the drill rig for PQ
metallurgical drilling followed by the subsequent expected slower pace of
advance for this larger diameter core.

 

Hole PEP-066 was a hole drilled to provide material for detailed metallurgical
testing - the hole was drilled using a wider diameter PQ bit to provide
additional material for testing and was drilled through the centre of the ore
body so as to provide material representative of all mineral domains thus far
identified. In order for all domains to be intersected, it was necessary to
drill into known ore zones, and thus PEP-066 was drilled very close to several
previous holes that had returned high grade intersections.

 

These three holes have all returned exceptional high grade gold assay results.

 

 

 Hole Number     From (m)     To (m)     Interval (m)    Au (g/t)
 PEP065          10.7         13.6       2.9             2.79
                 30.5         63.9       33.4            2.84
 Including       40.45        53.5       13.05           5.87
 PEP065B*        15.15        17.1       1.95            3.04
                 25.9         59.7       33.8            2.84
 including       27.9         39.35      11.45           5.45
 PEP066          0            112        112             5.25
 including       17.2         46.5       29.3            8.92
 including       35.9         46.5       10.6            12.25
 including       43.25        46.5       3.25            22.95
 including       92.4         111.3      18.9            8.04

Table 1. Latest drill Intercepts, Pepas Prospect

 

* Hole PEP065 collapsed in broken ground and was redrilled as PEP-065B from
the same pad, at a steeper angle

 

 

Figure 2.  Plan of holes

 

Figure 3. Section, PEP065 and 65B

 

 

Figure 4. Section, PEP066

 

 

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.

 

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 confirmed Anglo American's previous work and mapped several
large dioritic intrusions and associated epithermal systems.

 

The Company subsequently began a large-scale soil geochemical survey in May
2025, planned to cover most of what was thought to be the extent of the
porphyry system.  Soil samples were taken at roughly 25m intervals, along
ridges and spurs for ease of access and to ensure soils were residual.

 

This survey has just been completed, with gold assay results identifying a
substantial, gold bearing system, with highly anomalous geochemical responses
over a large, well preserved zoned porphyry system, with soil samples assays
at times exceeding 1g/t Au.

 

Figure 5. El Cedro Soil Samples

 

Company geological teams have examined these new geochemical data, in
conjunction with historical mapping information and airborne geophysical data
collected in 2012.  An outcome of this work is the hypothesis that El Cedro
may in fact consist of multiple porphyry intrusions, with a second potential
intrusive system being identified to the south of the known El Cedro porphyry,
within the same regional structural corridor.

 

Of additional interest is apparent associated epithermal systems marginal to
both porphyries, with high-grade gold in rock chips having been previously
recorded in veins.

Figure 6. El Cedro, multiple porphyry bodies, soils and rock chips

 

 

Figure 7. Regional tectonic setting

 

The Company is now planning additional mapping and soil sampling programs over
this southern porphyry.  In addition, it has been determined that the older
airborne geophysical data, while of value, were of moderate quality and thus
it is planned that a more detailed helicopter aeromagnetic and radiometric
survey will be undertaken in November or December this year to provide an
added layer of lithostructural information about these intrusive systems, the
associated epithermal systems, and APTA to the north.

 

It is expected that drilling at El Cedro could commence in first quarter of
calendar 2026.

 

NI-43-101 Technical Report

The Company's geological consultants are currently well advanced in reviewing
all exploration work undertaken at Anzá since the last NI43-101 technical
report was published in 2019. An external team is due on site in the first
week of November to finalise this program and to observe and assess all of the
QAQC processes and procedures.

 

The primary objective of this work program is the development of an updated
NI43-101 Technical Report which may, if deemed appropriate by the consultants,
include a Mineral Resource Estimate for the Pepas prospect.

 

 

 

El Pantano - Argentina

The El Pantano Project is an early-stage gold/silver exploration project in
Santa Cruz province, southern Argentina.

 

The Project comprises approximately 550km2 of contiguous granted licences in
the prolific Deseado Massif of Santa Cruz, roughly 45km from Anglo Gold's
Cerro Vanguardia mining camp and 90km SE of Newmont Mining's giant Cerro Negro
mine.

 

The El Pantano Project is subject to an Exploration & Joint Venture ("JV")
agreement ("Agreement") with private Argentinean company DESEADO DORADO S.A.S
and its shareholders ("Deseado"), the details of which were announced on
February 15(th) 2022.

 

The Company currently owns 51% of El Pantano, having met its obligation to
spend US$1m in exploration expenditure by February 2025. The Company is now in
Phase 2 of the joint venture, whereby it may earn an additional 49% equity in
the project (taking the Company to 100% ownership) by investing US$2m in the
two years to February 2027.   Upon such an event, the original vendors would
retain a 2% NSR royalty, 1% of which the Company could purchase for US$1m at
its discretion.

 

At the time the JV commenced, the El Pantano project was a largely untouched
grass roots gold/silver exploration project.  Some historical sampling and
geophysics had been done in the SE of the project, but 80% of the project area
had never been explored and no drilling had ever been undertaken anywhere
within the Project area.

 

The Company entered the JV on the basis of regional geological data and field
mapping that indicated the potential for a major, previously unknown
district-scale low-sulphidation epithermal system.

 

Post signing, the Company immediately began the process of geological mapping,
geochemical sampling and geophysics across the licence package.

 

This work was completed in late 2024, with all work to date confirming our
geological hypothesis that El Pantano is a highly prospective, untouched
epithermal system.

 

 

Figure 8.  El Pantano geology and geochemistry

 

The Company has taken the decision that the Project is drill ready.  A camp
has been established in this remote region and a diamond drill rig will arrive
on site this week, with a plan to commence drilling in coming days.

 

The Company has planned a 3000m diamond drilling campaign across various
sections of the identified 25km long epithermal structure, targeting
geochemical and geophysical anomalies.  It is expected this program will
continue into late January 2026, allowing for the Christmas break.

 

This drilling program is designed purely to be reconnaissance in nature.  No
drilling has ever been undertaken on the El Pantano property, and while
surface geological data are encouraging, information related to the vertical
zonation is required to develop the exploration model.

 

Orosur CEO Brad George commented:

"Post our recent capital raising, Orosur is now free to explore.  Our
strategy of geological selection, 100% ownership and examining near term
production is paying dividends, positioning us well in this buoyant gold
market".

 

 

 

 

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

 

Orosur Mining Inc

Louis Castro, Executive Chairman

Brad George, CEO

info@orosur.ca

Tel: +1 (778) 373-0100

 

SP Angel Corporate Finance LLP - Nomad & Joint Broker

Jeff Keating / Jen Clarke / Devik Mehta

Tel: +44 (0) 20 3470 0470

 

Turner Pope Investments (TPI) Ltd - Joint Broker

Andy Thacker/James Pope

Tel: +44 (0)20 3657 0050

 

Flagstaff Communications and Investor Communications

Tim Thompson

Mark Edwards

Fergus Mellon

orosur@flagstaffcomms.com

Tel: +44 (0)207 129 1474

 

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 2022/2025 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

 

*  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.

 

About the Anzá Project

Anzá is a gold exploration project, comprising three exploration licences,
and a large number of licence applications, totalling 399km2, in the prolific
Mid-Cauca belt of Colombia.

 

The Anzá Project is currently wholly owned by Orosur via its subsidiaries,
Minera Anzá S.A. and Minera Monte Aquila S.A.S.

 

The project is located 50km west of Medellin and is easily accessible by
all-weather roads and boasts excellent infrastructure including water, power,
communications and large exploration camp.

 

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, 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 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.

 

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