REG - Orosur Mining Inc - Maiden Mineral Resource Estimate at Pepas
10/02/2026 07:00
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RNS Number : 2951S Orosur Mining Inc 10 February 2026
Orosur Mining Inc.
('Orosur' or 'The Company')
Maiden Mineral Resource Estimate at Pepas, Anzá Project, Colombia
· Maiden Mineral Resource Estimate at Pepas of 1.14 Mt at 5.46 g/t Au
in Indicated classification for 201,000 ounces of contained gold.
· Additional Inferred Mineral Resource of 0.19 Mt at 2.99 g/t Au for
18,000 ounces of contained gold.
London, February 10(th) 2026. Orosur Mining Inc. ("Orosur" or the "Company")
(TSXV/AIM:OMI), is pleased to announce the completion of a maiden Mineral
Resource estimate ("MRE") for the Pepas deposit, at the Company's Anzá
Project in Colombia.
The Anzá Project 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, Antioquia state, Colombia. Orosur owns 100% of these
titles and applications through two Colombian wholly owned subsidiary
companies, Minera Anzá, and Minera Monte Aguila.
The Pepas gold deposit is located in the northern part of the Anzá project
area and was discovered by the Company's previous JV partners in early 2022,
but not advanced. When the Company reassumed 100% ownership of Anzá in
November 2024, it commenced drilling immediately at Pepas with positive
results, leading to the decision in June 2025 to focus drilling entirely at
Pepas to allow estimation of a Mineral Resource as quickly as possible.
Orosur CEO Brad George commented:
"The Company's decision to focus its efforts on moving the Pepas deposit
toward an MRE has been justified with this result. We will now immediately
move Pepas into the economic study and permitting stage, while at the same
time expanding our exploration effort to begin testing e other prospects
within the Anzá project."
Figure 1. Anzá Project
Pepas Mineral Resource Estimate
A Mineral Resource Estimate ("MRE") has been completed for the Pepas deposit
by international mineral consulting firm, Bara Consulting Limited, with an
effective date of 16 January 2026. The MRE was prepared in accordance with the
2019 Canadian Institute of Mining, Metallurgy and Petroleum ("CIM") Estimation
of Mineral Resources & Mineral Reserves Best Practice Guidelines and 2014
CIM Definition Standards for Mineral Resources & Mineral Reserves and
disclosed to National Instrument 43-101 ("NI 43-101"). Details of the MRE
evaluation will be provided in a Technical Report prepared in accordance with
NI 43-101 filed under the Company's SEDAR profile within 45 days of this
release.
The Pepas Mineral Resource comprises an estimated 1.14 million tonnes at a
grade of 5.46 g/t gold for 201,000 ounces of gold in the Indicated Mineral
Resource category and 0.19 million tonnes at a grade of 2.99 g/t gold for
19,000 ounces of gold in the Inferred Mineral Resource category and assumes
extraction via an open pit mining scenario. Mineral Resources are classified
as Indicated and Inferred based on CIM Definition Standards.
The resource is entirely contained within an open pit shell, down to a
vertical depth of approximately 100m, with mineralisation starting at
surface. The MRE and pit shell have been generated using a gold price of
US$3000/oz and a reporting cut-off grade of 0.92g/t Au.
Deposit Resource Category Tonnes (Mt) Gold Grade (g/t) Contained Gold (ozs)
Pepas Indicated 1.14 5.46 201,000
Pepas Inferred 0.19 2.99 18,000
Table 1. Resource table, Pepas
1 Tonnages are rounded to the nearest 10,000t to
reflect this as an estimate.
2 Metal content is rounded to the nearest 1,000ozs
to reflect this as an estimate.
3 Mineral Resources are not Mineral Reserves and do
not have demonstrated economic viability.
4 Mineral Resources are reported above a cut-off
grade of 0.92 g/t Au within a conceptual pit shell
generated in support of reasonable prospects of
eventual economic extraction (RPEEE) as per
CIM Estimation of Mineral Resources and Mineral
Reserves Best Practise Guidelines prepared by
the CIM Mineral Resource and Mineral Reserve
Committee and adopted by the CIM Council on
November 29, 2019 which incorporates gold
price, payability, recovery, throughput, mining costs,
processing costs and transport cost
assumptions which are considered reasonable at a conceptual level.
5 The conceptual pit shell has been generated using
the following assumptions and parameters; throughput of 250ktpa,
gold price
(USD$3,000), payability (99.5%), Au recovery
(88.75%), ROM transport cost (USD$2.50/t)
processing costs (USD$60/t), G&A cost
(USD$10/t) and mining costs (US$2.05/t, US$3.40/t and
USD$3.50/t for oxide, transitional and fresh
material respectively)
6 The QP is not aware of any legal, permitting,
title, taxation, socio-economic, marketing, political
environmental or other risk factors that might
materially affect the estimate of Mineral Resources
Figure 2. Grade tonnage curve
Figure 3. Plan of holes, block model and pit shell
Figure 4. Example block model cross section and pit shell above 0.92g/t Au
cutoff
Figure 5. Block model cross section, resource classification
Figure 6. Isometric view
MRE Parameters and Methodology
The Mineral Resource estimate is estimated from diamond drill hole data
contained within a database at a cut-off date of 16 January 2026. The data set
used for estimation includes a total of 79 diamond drill holes representing
10,592.10 metres of drilling. The current drill hole spacing ranges from
approximately 15m to 30m over the deposit.
Mineral Resource domains were created within a NW-SE fault-bounded block whose
dimensions are approximately 200m (strike length) x 100m (width) to a maximum
depth of 100m in which gold is hosted within a broadly NNW-SSE to NNE-SSW
trending sinuous zone of quartz veining. Bounding structures have been
modelled and are broadly coincident with the broad extents of silic/sericitic
alteration as defined from logging and fundamentally constrain the mineralised
zones to a NW-orientated lozenge, mirrored by a nominal 0.15g/t Au threshold.
Two spatial grade domains (LG and HG - the latter above 1.0g/t Au) are
modelled using implicit modelling in Leapfrog™ software, supported by
statistical analysis of the dataset, orientated broadly N-S with subvertical
dip. In addition, a small, near surface domain hosted in colluvium has also
been modelled at a 0.5g/t gold cut-off.
In addition to mineralised domains, bounding faults and weathering surfaces
are modelled, constrained to topography and a flagged block model created into
which gold grade is estimated. Parent cell dimensions of 10m x 10m x 5m were
sub-celled down to a minimum 0.5m x 0.5m x 0.5m to ensure accurate
representation of mineralised domain geometries and volumes. Gold assay data
within mineralised domain was composited to 2m to ensure equal support in
grade estimation and appropriate grade capping was applied to mitigate the
influence of extreme grade values during estimation. Statistical and
geostatistical (variography) analysis was completed on 2m composites to assess
directions and ranges of grade continuity and inform estimation parameters
used. Density was assigned to the model via Inverse Distance Weighting (IDW)
using density values obtained from drill core samples across the deposit.
Grade estimation into parent blocks was run via Ordinary Kriging (OK) in three
passes of increasing search pass volume until all model blocks received an
estimated grade. Block model validations (global and local) were performed
including visual inspection of block grades against input composite grades,
comparison of global mean values, volume checks and swath plots to ensure no
significant bias in the estimate.
The Mineral Resource estimate meets the requirements of reasonable prospects
of eventual economic extraction (RPEEE) by reporting only material above a
cut-off of 0.92g/t Au derived from a conceptual open pit optimisation using
the following parameters; throughput of 250ktpa, gold price (USD$3,000),
payability (99.5%), Au recovery derived as the average from recent test work
results from drill core composite samples (88.75%), ROM transport cost
(USD$2.50/t) processing costs (USD$60/t), G&A cost (USD$10/t) and mining
costs (US$2.05/t, US$3.40/t and USD$3.50/t for oxide, transitional and fresh
material respectively).
The Mineral Resource Estimate classification is informed by adequate close
spaced exploration drilling, sufficient understanding of the geological and
structural framework at Pepas, appropriate QA/QC controls providing acceptable
confidence in the overall quality of sampling and accuracy/precision of assay
data, confidence in the mineralisation domain interpretations and
geostatistical analysis, sufficient to assume (in the case of Indicated
Mineral Resources) or imply (in the case of Inferred Mineral Resources)
geological and grade continuity. Indicated Mineral Resources have been
classified where block grade estimates have been captured in the first search
pass (up to 30m - the range of continuity as defined by the variogram).
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
Anzá Project with the other sent for assay.
Drillhole samples from PEP001 to PEP011 (2022 programme) were submitted to ALS
Medellín, Colombia for sample preparation, with pulps subsequently analysed
at ALS Lima, Peru. Both laboratories hold ISO/IEC 17025:2017 accreditation for
the preparation and analytical methods performed. In a limited number of
instances, samples were forwarded within the ALS network to other ALS
facilities for final analysis, including laboratories in Canada, Laos, and
South Africa.
Drillhole samples from PEP012 to PEP074 (2024/2025 programme) were submitted
to Actlabs Colombia S.A.S. for both sample preparation and analysis. The
laboratory is certified to ISO 9001
Samples submitted to ALS were bar-coded and logged into the Laboratory
Information Management System, weighed, dried, and finely crushed to over 70%
passing a 2-millimetre screen. A sub-sample of up to 250g is taken using a
riffle splitter and pulverized to over 85% passing 75 microns. The pulverised
sample is then split for delivery to the analysis lab. Gold was analysed by
fire assay at ALS using a 30 g charge with an atomic absorption spectroscopy
(AAS) finish (ALS method Au-AA23). Samples returning gold values above the
upper limit of the Au-AA23 method were re-analysed by fire assay with
gravimetric finish. Where coarse gold was suspected based on geology and/or
assay behaviour, selected samples were re-analysed by Screen Fire Assay (SFA).
Samples sent to Actlabs were logged into the Laboratory Information Management
System manually, oven dried, and finely crushed to over 80% passing a
2-millimetre screen. A sub-sample of up to 250g is taken using a riffle
splitter and pulverized to over 95% passing 105 microns. A 30g is then split
for the analysis. Gold was analysed by fire assay with AAS. samples returning
>10 g/t Au were routinely re-analysed by fire assay with gravimetric
finish.
a QA/QC program is in place to ensure that sampling, laboratory submission,
data handling, and verification practices meet accepted industry standards
suitable for public reporting. Roles and responsibilities are defined across
project management and geology personnel, with implementation verified through
staff training and periodic (scheduled and unscheduled) audits covering field
methods, sample custody, laboratory processes, and database integrity.
Quality control monitoring is based on routine insertion of control samples to
assess contamination, precision, and accuracy. Control samples include coarse
blanks (BKG) to monitor preparation contamination, certified reference
materials (CRM) to monitor analytical accuracy, and duplicates to monitor
precision at multiple stages: field duplicates (DU), coarse/crush duplicates
(DUG), and pulp duplicates (DUP) at insertion rates of 1 in 40 (12.5%).
The QP has reviewed the QA/QC procedures, analytical data and information
provided in relation to lab audits, non-conformity reporting, sample security
and completed analysis of available data which indicates that, overall, the
analytical dataset is acceptable for use in a Mineral Resource Evaluation.
Pepas and Anzá Project Geology
The Anzá Project is located in the Middle Cauca belt of Colombia on the west
side of the Romeral-Cauca fault system. The project predominantly overlies
Upper Cretaceous to Palaeocene mafic and intermediate volcanic rocks and
sediments of the Western Cordillera, deposited in oceanic plateau to
intra-oceanic arc settings and intruded by co-magmatic stocks of gabbro to
quartz-diorite composition. More localised Miocene porphyritic intrusions are
of diorite to granodiorite composition.
The Pepas deposit is located in the northern portion of the Anzá Project and
is interpreted as an intermediate sulphidation epithermal gold system. Gold
mineralization at Pepas is hosted within volcaniclastic and epiclastic rocks
of the Upper Cretaceous Barroso Formation
The Pepas Mineral Resource occurs within a NW-trending fault zone termed the
Pepas fault zone, an antithetic fault relative to the NE-trending Aragón
fault. The Mineral Resource is bounded by two strands of the fault, the
southwest bounding fault dipping to the northeast and the northeast bounding
fault dipping to the southwest. These faults and their splays also converge to
the northwest and southeast and, as a result, the Mineral Resource has been
estimated within an enclosed fault-bounded lens or lozenge.
Within the fault lozenge, the tuffaceous and epiclastic host rocks show strong
to intense silicification, quartz-sericite alteration, and steeply-dipping
quartz veining at 1-10 cm scale. Veining has a dominant north- to NNE-trend
which is parallel to the regional grain but oblique to the bounding faults.
Overprinting argillic alteration in the fault and shear zones is variably
pyritic but only weakly anomalous in gold.
Veining is banded and sinuous banded with thin sulphidic laminae and
selvedges, suggestive of epithermal style with multi-stage repeated pulses of
mineralizing fluid over an extended period of time. The sulphide content is
low, with predominant pyrite and sphalerite and subordinate galena and
chalcopyrite. Gold grade is closely related to intensity of veining and
abundance of sulphide, predominantly low-iron sphalerite and pyrite, with
subordinate galena and chalcopyrite.
Figure 7. Regional Geology, Anzá Project area.
For further information, visit www.orosur.ca
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, 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
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.
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 Mineral Resource estimate disclosed herein and other scientific and
technical information which supports this news release was prepared under the
supervision of Mr. Galen White, BSc (Hons), FAusIMM, FGS, Principal Consultant
- Bara Consulting Limited, in accordance with Canadian regulatory requirements
set out in National Instrument 43-101 Standards of Disclosure for Mineral
Projects ("NI43-101"). Mr. White is a Qualified Person ("QP") as defined under
NI 43-101. Mr White is independent of the Company. Verification activities
included a site visit by Mr. White to the property in November 2025 for the
purposes of ground truthing, geological review, drill hole inspection,
verification of data collection activities, QA/QC review and validation of
input data used in MRE estimation. Mr White has reviewed and approved the
contents of this news release in the form and context in which it appears.
A technical report relating to the Anzá Property, and which includes Mineral
Resource estimation material disclosure, prepared in accordance with NI
43-101, will be filed under the Company's profile on SEDAR+
at www.sedarplus.ca
(https://protect.checkpoint.com/v2/r04/___http:/www.sedarplus.ca/___.Y3A0YTplbi1yeW46YzpvOjA3NzJiNjA3NGU1MWI5YzM2MDhmNTE5YjVlYzI2NzUzOjc6N2Q0OToxMDA1MzJlYWZmY2UwYTdhNWYyODMzODhlOTU2MzcyNjUzOTFiMzQ4ZWJjMWMzZTdiYWI2YTRlNWM4N2U0Mjc3OnA6VDpU)
within the required regulatory deadline."
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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