REG - Orosur Mining Inc - High grades continue Pepas, El Cedro prospectivity

Orosur MiningAnnouncement

09/09/2025 07:00

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RNS Number : 4876Y  Orosur Mining Inc  09 September 2025

 

 

 

Orosur Mining Inc - High grades continue at Pepas, El Cedro prospectivity
developing.

 

·    Assays for six more holes from the Pepas MRE infill program include:

o PEP054 - 20.6m @ 2.01g/t Au

o PEP055 - 47.25m @ 15.25g/t Au

o PEP056 - 22.5m @ 1.64g/t Au

o PEP057 - 7.45m @ 3.05g/t Au and 17.1m @ 5.47g/t Au --

o PEP058 - 34.85m @ 3.24g/t Au

·    El Cedro soil program producing exceptional results.

 

London, September 9th, 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 flagship, 100% owned, Anzá Gold
Project ("Project") in Colombia.

 

Anzá - Colombia

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.

 

These six holes announced today are a continuation of this program and
designed largely to infill to the required spacing to allow an MRE to be
calculated to a high level of confidence, and to define and understand the
nature of the ore body margins and mineralising controls.

 

Results from these holes continue to firm up the Pepas orebody and provide
better definition of the nature of the thick, high-grade mineralisation.
Recent results are largely as expected in terms of the grade distribution
across Pepas. However, PEP055 unexpectedly intersected an extremely high-grade
vein at a downhole depth of only 30m, well beyond the grades that have thus
far been encountered. While only narrow (1.9m downhole width), this vein could
be significant, and more work will be required to understand its extent and
thus its geological and MRE significance.

 

The MRE infill drill program is ahead of schedule, and subject to a
mid-program review, could be completed by late October 2025.  Once complete,
the rig will then move back to exploration, either around Pepas, or at the
APTA prospect to better understand the newly evolving geological model there.
This decision will be made in coming weeks.

 

A comprehensive metallurgical test program is currently being developed for
Pepas, with discussions underway with several laboratories in South and North
America.  These plans are hoped to be finalised soon, and it is anticipated
that one or two wider diameter (PQ) metallurgical holes will be required to
provide the necessary weight of material for testing.

 

 

 

 Hole Number     From (m)     To (m)     Interval (m)    Au (g/t)
 PEP054          20           40.6       20.6            2.01
 including       33.1         39.6       6.5             3.29
 PEP055          22.05        69.3       47.25           15.25**
 Including       27.85        41.8       13.95           45.99**
 Including       29           30.9       1.9             303.25**
 PEP056          6            28.5       22.5            1.64
 including       22.8         28.5       5.7             3.78
 PEP057          2.95         4.85       1.9             1.19
                 10.85        18.3       7.45            3.05
 including       10.85        12.5       1.65            12.31
                 29.8         46.9       17.1            5.47
 including       32.85        41.1       8.25            8.85
 including       35.8         37.8       2               26.55
 PEP058          9.75         18.65      8.9             0.62
                 32.95        67.8       34.85           3.42
 including       38.9         59         20.1            4.7
 PEP059          13.4         27.6       14.2            0.75

Table 1. Latest drill Intercepts, Pepas Prospect

** see section below on coarse gold

 

 

Figure 1.  Plan of holes

 

Figure 2. Section, PEP054, 055

 

Figure 3. Section PEP056, 057, 058, 059

 

 

Coarse Gold - PEP055

The quoted composite assay result from PEP055 of 47.25m @ 15.25g/t Au has been
influenced by two consecutive high-grade samples across 1.9m in which visible
gold was noted in core. These two consecutive samples returned 465.71g/t Au
and 122.74g/t Au respectively. Outside these two samples, grades assayed were
largely in line with adjacent holes.

 

The Company feels that these two samples represent a real, and very high-grade
vein, but are also cognisant that coarse gold has the potential to create a
sampling bias if incorrect sample preparation has resulted in heterogenous
distribution of gold throughout the sample.

 

To assess the potential impact of this, pulps from these two samples were
re-assayed twice, with reasonably consistent results (table 2). The Company is
therefore confident that no significant sampling bias has occurred.
Geologically however, such high-grade samples are a statistical outlier and
will require further understanding so that their impact on a MRE is accurately
reflected.

 

 Sample           Original assay  Re-assay 1  Re-assay 2
 Sample 1 - 1m    465.71ppm       453.19ppm   478.23ppm
 Sample 2 - 0.9m  122.74ppm       121.16ppm   124.33ppm

Table 2. Coarse gold re-assay

 

 

El Cedro - Anzá, Colombia

The El Cedro prospect is a large gold porphyry/epithermal system, located
toward the south of the Anzá project, on the same granted exploration title
as the Pepas and APTA deposits.

 

El Cedro had been explored in cursory fashion by Anglo American, prior to
Orosur taking ownership of the Project in late 2014, with additional mapping
and ground geophysics then carried out by the Company's previous JV partner
MMA in 2022 and 2023.

 

No drilling has ever been undertaken on the prospect.

 

The region has sparse outcrop, but a large porphyry system had been identified
and roughly defined from regional mapping and more recent airborne magnetic
and radiometric data.   Several phases of soil geochemical surveys were
carried out in the centre of the prospect, around a central core of potassic
alteration visible from airborne radiometrics, and in nearby creeks where
fresh rock had been exposed.

 

A large area of anomalous soils was historically sampled in the centre of the
prospect with numerous high grade rock chip and channel samples of between 1
and 9 g/t Au in surrounding creeks in later stage polymetallic veins (Figure
4).

 

To better define the scope and nature of El Cedro, the Company recently
commenced a wider scale ridge and spur soil sampling program over the entire
extent of what is thought to be the porphyry system. Being rugged terrain,
sampling was limited to ridges and spurs to ensure that sampled material is
residual and insitu.

 

Figure  4. El Cedro prospect- previous sampling (Anglo and MMA) and sampling
plan

 

After a brief pause due to limited access during the wet season, this program
has recommenced and is now approximately 65% complete.

 

Figure 5. Orosur soil sampling, El Cedro - progress

 

Gold assay results thus far are highly encouraging with large areas of over
0.3g/t Au and at times over 1g/t Au being identified in soils and saprolite
around a central core.

 

Geological mapping being undertaken in conjunction with the soil program is
also now better defining the porphyry system and the associated vein systems.
Base metals associations have also been noted in outcrop, however, base metal
assays require a different assay method not available in Colombia and these
will require several weeks to be returned.

 

The Company feels the ongoing work program is showing El Cedro as a complex
and highly prospective gold porphyry system.  Once this current program is
complete in coming weeks, all data will be compiled with a view to planning
the next phase of work, which could involve drilling.

 

Orosur CEO Brad George commented:

"The Anza Project continues to develop and broaden in scope. Pepas is
progressing toward MRE as planned, but the results at El Cedro are showing
this licence has much more to give".

 

 

Colombia - ANZÁ Project

The Anzá Project is now 100% owned by the Company following completion of a
Share Purchase Agreement ("SPA"), announced 28(th) November 2024, whereby the
Company purchased all of the shares of its previous JV partner; Minera Monte
Aguila ("MMA").

 

The Project, which is located 50km west of Medellin, is easily accessible and
boasts excellent infrastructure including water, power and communications as
well as a large exploration camp.

 

From September 2018 to November 2024, the Anzá Project was under the control
of its previous JV partner MMA, itself a 50/50 venture between the world's two
largest gold miners, Agnico Eagle Mines and Newmont Mining.

 

Prospects

The Company is currently focussed on three prospects within the Anzá Project
- Pepas, APTA and El Cedro. All three prospects are within the same granted
exploration title that is broken into two, non-contiguous pieces (Figure 5)

 

Drilling is currently being undertaken at the Pepas prospect in the northern
extent of the Anzá Project (pre-acquisition) over 10km north of the central
base camp at APTA. In parallel, mapping and sampling is being undertaken over
the El Cedro porphyry system in the south of the project area.

 

 

Figure 6. Main prospects, licences pre-MMA acquisition

 

 

Holes Drilled post MMA Transaction

48 holes have been drilled at Pepas since the MMA Transaction in November
2024.

Assay results are tabulated below.

 

 Hole Number     From (m)     To (m)     Interval (m)    Au (g/t)
 PEP012          0            66.75      66.75           5.64
 PEP013          0            77.30      77.30           7.68
 PEP014          0            75.1       75.1            5.58
 PEP015          23.5         63.7       40.2            3.75
 PEP016          61.6         105.3      43.7            3.13
 PEP017          56.1         96.3       40.2            2.06
 PEP018          0            54.1       54.1            6.01
 PEP019          0            44.3       44.3            1.63
 PEP020          0            54.65      54.65           1.94
 PEP021          0            107.05     107.05          6.22
 PEP022          0            76.3       76.3            7.24
 PEP023          0            15         15              1.7
 PEP024          9.24         15.6       6.35            1.99
 PEP025          0            10.1       10.1            1.45
                 16.5         79         62.5            5.4
 PEP026          0            14.8       14.8            0.57
                 43.6         72         28.4            2.52
 PEP027          1            80.15      79.15           2.0
 PEP028          29.5         60.85      31.35           1.61
 PEP029          0            30.7       30.7            0.31
 PEP030          0            77.9       77.9            0.32
                 115.6        122.6      7               0.31
 PEP031B         28.15        41.1       12.95           0.73
                 74.1         95.9       20.8            0.3
 PEP032          0            92         92              1.68
 PEP033          0            21.3       21.3            5.88
 PEP034          36           95         59              10.15
 PEP035          0            11.4       11.4            2.71
 PEP036B         0            40.45      40.45           0.62
 PEP037          0            3          3               0.65
 PEP038          0            16.8       16.8            0.68
 PEP039          No significant intersections
 PEP040          0            10.25      10.25           1.35
 PEP041          34.35        66.1       31.75           2.01
 PEP042          104.8        107.55     2.75            1.41
                 116.45       119.7      3.25            4.89
 PEP043          No significant intersections
 PEP044          5.8          44.3       38.5            6.01
 PEP045          9.5          71.8       62.3            12.76
 PEP046          0            53.2       53.2            3.36
 PEP047          0            104        104             6.61
 PEP048          0            32.3       32.3            3.65
 PEP049          0            94.2       94.2            3.74
 PEP050          0            34         34              2.33
 PEP051          0            7.4        7.4             0.43
                 11.2         72.5       61.3            3.36
 PEP052          0            4.4        4.4             2.24
                 9.4          81.25      71.85           6.13
 PEP053          17           27.1       10.1            0.9
 PEP054          20           40.6       20.6            2.01
 PEP055          22.05        69.3       47.25           15.25
 PEP056          6            28.5       22.5            1.64
 PEP057          10.85        18.3       7.45            3.05
                 29.8         46.9       17.1            5.47
 PEP058          32.95        67.8       34.85           3.42
 PEP059          13.4         27.6       14.2            0.75

Table 3.  Results to date, post MMA Transaction

 

 

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/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

 

*  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, Argentina and Nigeria.

 

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, 2024. The Company's continuance as a going concern is
dependent upon its ability to obtain adequate financing, to reach profitable
levels of operations and to reach a satisfactory closure of the Creditor´s
Agreement in Uruguay. These material uncertainties 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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