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
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
530km
2
, 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."
For further information, visit
www.orosur.ca
, follow on X
@orosurm
or please contact:
Orosur Mining Inc
Louis Castro, Chairman,
Brad George, CEO
Tel: +1 (778) 373-0100
SP Angel Corporate Finance LLP - Nomad & Joint Broker
Jen Clarke / Caroline Rowe / 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
Alison Allfrey
Fergus Mellon