London, August 26 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 flagship, 100% owned, Anzá Gold Project ("Project") in Colombia, and its El Pantano Gold/Silver
Orosur Mining Inc - infill drilling continues to deliver, 71.85m @
6.13g/t Au.
• Assays from four more holes from the Pepas MRE infill program
include:
o PEP050 - 34m @ 2.33g/t Au from surface
o PEP051 - 61.3m @ 3.36g/t Au
o PEP052 - 71.85m @ 6.13g/t Au
• El Cedro soil sampling 45% complete - first samples submitted
for assay.
• Contracts being finalised for El Pantano (Argentina) drilling -
planned to commence mid-October.
London, August 26 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 flagship, 100% owned,
Anzá Gold Project ("Project") in Colombia, and its El Pantano Gold/Silver
Project ("El Pantano") in Argentina.
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.
The first several holes of this program (announced 17th July 2025), vindicated
this decision by returning exceptional widths and grades, especially hole
PEP045 which returned 62.3m @ 12.76g/t Au.
The drill program has been designed in conjunction with external consultants
to facilitate a MRE being calculated, with the multiple objectives of infilling
previous drilling, expanding beyond current drilling to define the boundaries,
and understanding th e geological controls upon mineralisation and the
variations in geology and grade across the deposit.
Holes will be drilled in an order that attempts to address these issues
concurrently.
These four holes announced today are a continuation of this program and
designed largely to infill to the required spacing to allow a MRE to be
calculated to a high level of confidence. Drilling continues to return thick
sequences of high-grade gold mineralisation, starting from surface or near
surface.
Importantly, drilling is also providing guidance as to grade and mineralogical
variation across the ore body that will allow our teams to define various
metallurgical domains that will in turn form the basis of more advanced
metallurgical studies that are planned to commence soon.
Hole Number From (m) To (m) Interval
(m) Au (g/t)
PEP050 0 34 34 2.33
including 9.65 12.65 3 3.71
including 23.3 25.4 2.1 9.4
PEP051 0 7.4 7.4 0.43
11.2 72.5 61.3 3.36
including 27.4 36.5 9.1 5.93
including 39.3 48.9 9.6 5.31
PEP052 0 4.4 4.4 2.24
9.4 81.25 71.85 6.13
including 29.95 48.4 18.45 13.51
65.2 71.2 6 9.11
PEP053 17 27.1 10.1 0.9
Table 1. Latest drill Intercepts, Pepas Prospect
Figure 2. Plan of holes
Figure 3. Section, PEP050
Figure 4. Section PEP051, PEP051 and PEP053
El Cedro - Anzá, Colombia
The El Cedro prospect is a large gold porphyry system, located toward
the south of the Anzá project, on the same granted exploration licence
as the Pepas and APTA deposits.
The Company has recommenced a large ridge and spur soil sampling
program that had been previously suspended due to seasonal rain and
access issues. This program is now roughly 45% complete, and it is
expected that the remainder of the program should be co mpleted by
mid-October 2025.
The first batch of 40 samples from the restarted program have been
submitted for assay this week, with results expected soon.
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 licences in the
prolific Deseado Massif region, roughly 45km from Anglo Gold's Cerro
Vanguardia mining camp.
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 15th 2022. The Company has earned a 51% interest
in the El Pantano Project and must spend an additional US$2m in the two
years from Feb 14th, 2025, in order to earn 100% ownership.
The Company has been carrying out regional exploration at El Pantano for
several years, including geological mapping, geochemical sampling, ground
magnetics and induced polarisation geophysical surveys. These work
programs have provided evidence suggestive of major rift -related low
sulphidation epithermal system, of the type that has led to the development
of major gold and silver deposits in the region.
Drill permits for El Pantano were obtained late in 2024, and the Company is
now finalising drill contracts with a view to commencing drilling in mid -
October 2025, the first drill program that has ever been undertaken anywhere
on the property.
Between 10 and 14 diamond holes are planned for a total of approximately
3000m, targeting geological structures and geochemical/geophysical
anomalies identified from previous work. Additional details will be provided
once more precise timing is finalised.
The area is very remote and largely unpopulated and thus substantial effort
has been required to plan and develop the necessary camp and access
infrastructure for a drilling program of this size.
The Deseado Massif is a major gold producing area in Argentina and thus
some necessary downstream infrastructure exists in the region. In particular,
an international laboratory company has a fire assay facility in the regional
town of Perito Moreno and thus a short assay turnaround time (for gold and
silver) is anticipated.
Orosur CEO Brad George commented:
"Pepas remains on track and the high bar set by the early holes continues to
be cleared on a regular basis. In the meantime, we are excited to be getting
close to opening a second drilling front on our El Pantano project in
Argentina. Early stage, but this is elephant country, and we like what we have
seen thus far".
Colombia - ANZÁ Project ("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 2).
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 5. Main prospects, licences pre-MMA acquisition
Holes Drilled post MMA Transaction
38 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