REG - Orosur Mining Inc - Pepas MRE drilling near completion

Orosur MiningAnnouncement

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RNS Number : 2863L  Orosur Mining Inc  12 December 2025

 

 

 

Pepas MRE drilling near completion

Drilling at El Pantano in Argentina hits mineral system

 

 

·    Assays for five holes from the Pepas resource drilling program,
including:

o PEP067 - 83.7m @ 4.29g/t Au from surface

·    Resource modelling and NI43-101 report process under way

·    First holes from El Pantano drilling program confirm a low
sulphidation epithermal mineral system - awaiting assays.

 

London, December 12(th), 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 exploration projects at Anzá in
Colombia ("Anzá) and El Pantano in Argentina ("El Pantano").

 

Anzá - Colombia

 

The Anzá Project in Colombia comprises a number of granted exploration titles
and applications totalling roughly 330km(2), within the Mid-Cauca gold belt,
west of the city of Medellin.

 

These titles and applications are owned by two Colombian companies, Minera
Anzá, and Minera Monte Aguila, both of which are 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 body of gold mineralisation that the
Company is endeavouring to move to an initial Mineral Resource Estimate
('MRE') 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 2026, with the objective of advancing it toward an MRE.

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

 

 

 

 

Figure 1. Anzá Project

 

 

 

 

As announced on 14(th) July 2025, the Company had taken 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 as
quickly as possible.

 

The Company's external geological and resource consultants visited the Anza
site at the start of November to carry out the necessary QAQC verification of
drilling and sampling and to work with the Orosur geological team in the
development of a new NI43-101 technical report for the Anza project, which
will include a MRE for the Pepas Prospect.

 

One outcome of this visit was the recommendation by the consultants for an
extension of the final stages of the MRE drill-out program, with several
additional holes within and outside the Pepas deposit to define the boundaries
of the current deposit envelope and obtain a better understanding of the size
and controls of previously defined high-grade zones.

 

Holes drilled outside the deposit envelope have returned the lower grade halo
mineralisation as expected and have provided valuable information as to the
nature of the some of the controlling structures of Pepas. The one hole of
this current batch drilled inside the deposit envelope (PEP-067) returned a
result of 83.7m @ 4.29g/t Au from surface.

 

 

 Hole Number     From (m)     To (m)     Interval (m)    Au (g/t)
 PEP067          0            83.7       83.7            4.29
 including       21.6         39.05      17.45           7.12
 Including       61.7         72.5       10.8            8.06
 PEP068          0            8          8               0.67
                 17.4         22         4.6             0.37
                 47.55        51         3.45            0.34
 PEP069          0            2.25       2.25            0.96
 PEP070          0            2          2               1.34
                 37.7         40.45      2.75            1.11
                 84.1         149.4      65.3            0.68
 PEP071          0            3.2        3.2             0.42
                 71.35        78         6.65            0.45

Table 1. Latest drill Intercepts, Pepas Prospect

 

 

Figure 2.  Plan of holes

 

 

Figure 3. Section, PEP067

 

 

It is expected that the Pepas drill-out program will continue for the next few
days and the resulting MRE and technical report can then be completed during
January 2026.

 

Metallurgy

As part of the MRE process, a large diameter PQ drill hole was completed
specifically to provide sufficient material for a comprehensive metallurgical
testing program. These samples have been sent to the metallurgical testing
facility of ALS Global in British Columbia, where the work is now well
advanced. It is hoped this program may be completed by the end of the year and
thus feed into the Technical Report and MRE.

 

Wider Exploration - Anza

The Company had previously announced that it had planned to undertake a
detailed airborne magnetic survey over the EL Cedro and APTA prospects in
December, as a tool to provide additional guidance for drilling in early 2026.
The Company is engaging with contractors to commission the survey.

 

Mapping, sampling and trenching is also underway in the environs of the Pepas
deposit, as part of an ongoing program to explore for extensions and/or
repetitions of Pepas.  Once the current resource drilling program is
completed in coming weeks, it is likely the rig will be shifted to targets
being developed around Pepas.

 

 

 

 

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 550km(2) of contiguous granted licences in
the prolific Deseado Massif of Santa Cruz Province, roughly 45km from Anglo
Gold's Cerro Vanguardia mining camp and 90km SE of Newmont Mining's giant
Cerro Negro mine.

 

El Pantano 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.

 

Following several years of surface field work, the Company commenced the first
phase of drilling ever undertaken within the project area in early November
2025.  Between 3,000-4,000m is planned across the breadth of the project area
as a reconnaissance program designed to address a number of geological
questions:

·    Test sources of geochemical anomalism

·    Assess a variety of Induced Polarisation responses

·    Intersect, if possible, mineralised structures indicative of the low
sulphidation epithermal model being postulated at El Pantano

·    Gain understanding of the vertical variations in the system,
especially in relation to the potential for fluid boiling.

 

In a general sense, the broad objective of the program is to determine if a
mineral system is present at El Pantano, and if so, develop exploration plans
for further work.

 

 

Figure 4.  El Pantano geology and geochemistry

 

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.

 

To date, seven holes have been completed with samples from the first five
submitted to the laboratory in Perito Moreno for fire assay gold analysis, to
be followed by multi- element analysis, including silver, from the Mendoza
facility.

 

Visually, several of the holes have intersected extremely encouraging
structures showing textures and mineralogy consistent with what is seen in
other low sulphidation epithermal systems in the region.  In particular, the
presence of colloform banding in several intersected narrow veins is a key
indicator often seen in the core of low sulphidation epithermal systems.

 

Preliminary interpretation would suggest that vein textures are indicative of
lower temperatures, albeit with some examples of higher temperature
overprinting.  This would suggest that current drilling is still higher in
the system, above the boiling zone.

 

 

Fig 5. Colloform banding, El Pantano

 

 

 

The Company is confident that it has achieved its general objective of proving
the existence of a substantial mineral system. This is an extremely positive
and unusual result for the first drilling program on a grass roots project.
The challenge, however, is identifying where, within the mineral system,
economic widths and grades may have been deposited.

 

Drilling is progressing faster than anticipated and thus it is planned that
this program will be completed toward the end of January 2026.  Once
complete, all new and historical data will be compiled as the key component to
a targeting program that will develop the next phase of work.

 

 

 

 

 

 

Orosur CEO Brad George commented:

"Pepas is now in the final mile of its MRE process and the pieces are coming
together for a January report.  In the meantime, we are lining up targets for
when the rig is freed up later in December.  Drilling at El Pantano, as with
any undrilled project, was high risk, but we have hit what we hoped to hit - a
previously unknown mineral system.  Now we need to focus in, and given the
scale of the system, that is a challenge….but a good challenge".

 

 

 

 

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

 

Orosur Mining Inc

Louis Castro, 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/Guy McDougall

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 2022/2024 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

 

 

Drill Hole Details, El Pantano Project 2025 onward

 Hole ID  Easting (m)  Northing (m)  Elevation asl (m)  Dip (°)   Azimuth (°)
 ELP-001  527906       4697061       285                -50       190
 ELP-002  527970       4697238       266                -50       190
 ELP-003  528007       4697338       266                -50       190
 ELP-004  528044       4697438       266                -50       190
 ELP-005  527831       4697342       266                -55       010
 ELP-006  527831       4697342       266                -50       010
 ELP-007  529162       4696630       320                -50       010
 ELP-008  530497       4695922       285                -55       020

 

*  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 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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