Oroco Drills 26.48m of 1.18% CuEq in South Zone
August 6th, 2026 NEWS RELEASE
Oroco Drills 26.48m of 1.18% CuEq in South Zone
VANCOUVER, BC, August 6 th, 2026 – Oroco Resource Corp. (TSX-V: OCO; OTCQB: ORRCF)
("Oroco" or the "Company") is pleased to report the third set of assay results from its Phase 2 resource
drilling program focused on the South Zone at its Santo Tomás copper project, Choix, Sinaloa, Mexico.
Results are reported for drill holes S027 and S030 through S034. The Company continues drilling with
three rigs on site.
Highlights
Westernmost limit of inferred mineralization –central portion of the South Zone
• Holes S031 and S034 confirmed the local westward extension of mineralization beyond the current
inferred block model limits in the central western portion of the South Zone.
• Hole S031 is a hole drilled westwards at -65 degrees from the same pad as S029 (previous release).
The hole intersected near-surface mineralization and drilled out of inferred material, extending
newly identified mineralization westwards. Mineralized outcrops to the west of the intercept
suggest a wedge of mineralization extending up to 330m in that direction.
• Hole S033 was drilled at -50 degrees eastwards from a pad located 50m to the east of S034.
Intersected mineralization included 26.48m @ 0.90% Cu / 1.18% CuEq* from a depth of 48.0m.
Additional intercepts are included below.
• Hole S034 was collared 80m north of S031 and drilled westwards at -60 degrees. The hole
displayed mineralization similar to that observed in S031 and, as with S031, intersected
mineralization outside the inferred material. Surface mineralization to the west again supports a
wedge of additional mineralization to the west.
South end of the South Zone– Holes containing Oxide and Transition mineralization
• Hole S027 is a vertical hole drilled from the same pad as S030 and S032. The mineralization
observed in this hole, combined with results from S032 and S030 and surface expressions of copper
oxides, essentially defines the southern limit of the South Zone.
• Holes S030 and S032 have locally defined a southern limit of mineralization in the South Zone.
• Hole S030, located on the same pad as S032, was drilled at -50 degrees towards 280 °. A 49m
intercept of mixed oxide-sulphides was logged from 12m depth. Total copper assay over the
interval returned 0.80% CuTot. Additional sulphide mineralization below this interval is included
in Table 2.
• Hole S032 is located on the southernmost pad in the South Zone (S027 pad) and was drilled at
-45 degrees towards 150°. A mixed oxide-sulphide zone was observed from 0 to 49m depth. The
total copper assay over the interval 36 to 49m returned 0.80% CuTot and 0.31% CuSol (total
and soluble copper respectively). Sulphide mineralization below this interval is reported in Table
2.
“These Phase 2 results support the potential for additional resource outside of the 2024 Technical Report
block model and continue to support the approach being taken at Santo Tomás,” said Charles Cryer, Oroco
CEO. “Additional drilling to date in the southern half of the South Zone supports the potential for a higher-
grade zone as first identified in Phase 1 drill hole S018. Drilling to the west also has the potential for
additional tonnage beyond the inferred material classification limits.”
Soluble copper assays for Hole S027 were received and returned a 10.5 m mixed oxide-sulphide intercept
from 13.5m depth with 0.53% CuTot and 0.17% CuSol. At this stage, there is no technical report that
incorporates a plan for a copper leach recovery circuit. The Company has therefore elected not to report a
copper equivalent grade for significant intervals of mixed oxide and sulphide mineralization.
Phase 2 Program Overview
IT IS IMPORTANT TO NOTE that Phase 2 is designed primarily to convert Inferred resources to the
Indicated resource classification in the South Zone and to collect geotechnical, hydrogeological, and
additional metallurgical data required for Pre-Feasibility Study ("PFS") mine planning. Resource drilling
in the South Zone is almost complete. Rigs will thereafter be moved to “the Gap” in the pillar area between
the North and South Zones. The PFS is targeted for release in Q2/Q3 2027.
Table 1: Phase 2 Drill Holes S027, S030, S031, S032, S033 and S034
Hole East
(m)
North
(m)
Elev.
(m)
Dip
(deg.)
Az.
(deg.) Objective / Comment
S027 779,299 2,974,324 721 -90 0/360 Southern most drill pad. Testing southern end of
the inferred blocks in the 2024 Block Model
S030 779,298 2,974,325 721 -50 280 Southern most drill pad. Testing southern end of
the inferred blocks in the 2024 Block Model
S031 778,627 2,975,566 589 -65 270 Testing western limits of inferred blocks.
Mineralization based on drill hole results and
surface mineralization 330m to the west
suggests the potential for additional tonnage
S032 779,300 2,974,232 721 -45 150 Southern most drill pad. Testing southern end of
the inferred blocks in the 2024 Block Model.
Drill holes S027, 030 and 032, all intercepted
variable copper oxide mineralization in a mixed
oxide/sulphide zone. Southern limit now defined
S033 778,704 2,975,645 598 -50 100 Infill hole to the east of S034. Drilling supports
the 2024 block model with an additional higher
grade near surface intercept of 26.48m @
0.90% Cu / 1.18% CuEq from 48m depth
S034 778,656 2,975,640 587 -60 270 Testing western limits of inferred blocks.
Mineralization based on the drill hole results and
surface mineralization 330m to the west also
indicating potential for additional tonnage
Table 2: Significant Assay Results**
Hole From
(m)
To
(m)
Length
(m)
CuT
(%)
Mo
(%)
Au
(g/t)
Ag
(g/t)
CuEq
(%)
S027
13.5 41.82 28.32 0.47 0.011 0.015 3.22 n/a Ox
48 70 22 0.49 0.023 0.014 3.41 0.63
76 95 19 0.25 0.015 0.007 1.86 0.34
96 110.5 14.5 0.33 0.011 0.019 2.32 0.41
172.5 202 29.5 0.28 0.007 0.023 4.10 0.38
S030
12 61 49 0.80 0.023 0.032 0.79 n/a Ox
129 147 18 0.18 0.018 0.021 1.44 0.29
153 177 24 0.27 0.031 0.013 2.55 0.44
182 201 19.1 0.17 0.049 0.015 1.00 0.40
S031 26.7 103 76.3 0.28 0.012 0.008 2.49 0.37
S032
32 49 17 0.67 0.010 0.013 2.98 n/a Ox
49 76 27 0.32 0.009 0.007 2.16 0.38
82 109.5 27.5 0.32 0.005 0.007 1.55 0.35
S033
35.3 150 114.7 0.44 0.004 0.045 2.49 0.54
incl.
incl.
73.7
26.48
0.55
0.90
0.002
0.001
0.064
0.141
3.02
4.62
0.66
1.18
S034 42 145 103 0.31 0.011 0.011 2.789 0.39
* CuEq (%) = [(Cu% × Cu recovery (variable) × Cu price) + (Mo% × Mo recovery (variable) × Mo price) + (Au g/t × Au recovery
(variable) × Au price) + (Ag g/t × Ag recovery (variable) × Ag price)] ÷ (Cu price × Cu recovery (variable)). Metal prices are in
US$/lb (Cu, Mo) and US$/oz (Au, Ag). See Table 3. Metal recoveries are grade-based by individual assay in the reported intervals
and vary accordingly. In these intervals, Cu recovery ranges from 82-89%, Mo 50-60%, Au 30-85% and Ag 35-67%. Au and Ag
recoveries are dependent on copper and sulphur grades.
Drill hole intervals reporting sulphide and non-sulphide copper (oxide) results are not reported with a copper equivalent.
**Significant Intervals comprise intervals ≥ 10m of ≥ 0.15% Cu, but may include assay intervals of ≤ 4m of ≥ 0.05% Cu. This
continues the practice of significant interval reporting applied during Phase 1, including News Releases and the 2024 PEA.
+CuTot is the total contained copper % via ME-ICP62, four-acid digest.
++CuSol is the soluble copper assay via Cu-AA05 using a sulphuric acid leach conducted on intervals exhibiting oxidation.
All intervals are downhole drill core lengths. True widths will be confirmed when Phase 2 results are
incorporated into the updated geological and resource models. Where holes are drilled approximately
perpendicular to the interpreted structural attitude of the mineralization, core intervals are expected to
approximate true thickness.
Copper Equivalent (CuEq) Reporting
CuEq grades in this release are calculated using the variable metal recovery curves from Chapter 13 of the
Company’s 2024 Technical Report (“Santo Tomás Copper Project, Sinaloa, Mexico — Technical Report
on a Preliminary Economic Assessment” (the “PEA”), filed on SEDAR+ August 2024) and the metal price
deck in Table 3, reflecting 12-month actual trailing average prices to April 30, 2026. This price deck differs
from that used in the PEA.
Copper equivalent grades in this release are not directly comparable to CuEq grades reported in the
Company’s 2024 Indicated and Inferred Resource Summary Table or in earlier drill-result news releases
prior to 2024, which used different metal price assumptions and CuEq methodologies. The Company has
recalculated the significant-intercept database for the full drill-hole dataset using the updated CuEq
calculation: the historical drilling results and the results for holes S022 to S034 have been updated in the
VRIFY drill-hole viewer and are available at VRIFY and via the Company’s website. Intervals that include
soluble copper assays do not have CuEq values calculated.
Table 3: Metal Prices Used for Phase 2 CuEq Calculations
Metal Cu Mo Au Ag
Price (rounded) US$5.00/lb US$25.75/lb US$4,070/oz US$56.50/oz
Actual trailing average US$5.05/lb US$25.74/lb US$4,070.20/oz US$56.40/oz
Quality Assurance / Quality Control
Historical drilling data used in the resource estimate and design of the current exploration program were
subject to the data verification procedures described in the Company’s current Technical Report. Drill
collar locations are verified by differential GPS with checks against LiDAR data. Geological logging, core
sampling, sample preparation, analysis, and chain of custody are governed by QA/QC protocols that include
the insertion of certified reference standards, blanks, and duplicates. Samples are submitted to ALS
Chemex (Hermosillo, Mexico) for sample preparation; pulps are sent to ALS Canada Ltd. (Vancouver) for
analysis. Total copper, molybdenum, and silver are determined by ALS method ME-ICP61 (four-acid ICP-
AES); over-limit results use ore-grade assay method Cu-OG62, and non-sulphide copper is determined by
method Cu-AA05. Gold is determined by ALS method Au-AA23 (30 g fire assay with AAS finish).
Qualified Person
Andrew Ware, RM-SME, a Qualified Person as defined in NI 43-101 — Standards of Disclosure for
Mineral Projects, and a senior consulting geoscientist to the Company, has reviewed and approved the
technical disclosures in this news release. The Company adheres to CIM Best Practices Guidelines in
conducting, documenting, and reporting exploration activities.
About Santo Tomás
Santo Tomás is an advanced-stage porphyry copper project in Choix, Sinaloa, Mexico. Oroco holds a net
87.0% interest in the 1,173-hectare Core Concessions and an 80% interest in surrounding concessions at
Santo Tomás. The Project was tested by historical drilling from 1968 to 1994 and by Oroco's Phase 1
program, which totaled 48,481 metres in 76 diamond drill holes and supported the revised Mineral Resource
Estimate (“MRE”) and updated PEA.
The August 2024 MRE, prepared by SRK Consulting (U.S.), Inc., outlined an Indicated Resource of 540.6
Mt at 0.33% Cu, 0.008% Mo, 0.028 ppm Au and 2.1 ppm Ag and an Inferred Resource of 530.3 Mt at
0.31% Cu, 0.007% Mo, 0.023 ppm Au and 1.9 ppm Ag . The updated PEA, prepared by Ausenco
Engineering USA South Inc., contemplates a staged open-pit operation ramping from 60,000 t/d in Year 1
to 120,000 t/d by Year 8 over a 22.6-year life of mine, generating an after-tax NPV8% of US$1.48 billion
and an after-tax IRR of 22.2%. Both studies are available on SEDAR+ at www.sedarplus.ca and at
www.orocoresourcecorp.com. The PEA is preliminary in nature; see "Cautionary Note" below.
About Oroco Resource Corp.
Oroco Resource Corp. is a Vancouver-based mineral exploration and development company advancing the
Santo Tomás copper project in Sinaloa, Mexico.
For further information:
Charles (Charlie) Cryer, CEO
Oroco Resource Corp.
Tel: 604-688-6200 | [email protected] | www.orocoresourcecorp.com
Cautionary Note Regarding Forward-Looking Information
This news release contains forward-looking information within the meaning of applicable Canadian
securities legislation, including statements regarding: the Phase 2 drilling program and its objectives; the
consistency of drilling results with the 2024 Technical Report block model; the anticipated advancement
of the Santo Tomás Project toward a Pre-Feasibility Study and its targeted release in Q2/Q3 2027; planned
and ongoing drilling, access and pad development; pending assays and the anticipated release of additional
drilling data; the Company’s intention to update VRIFY with additional drill results; and the anticipated
conversion of Inferred resources to the Indicated category. Forward-looking information is based on
management’s current expectations and assumptions, including assumptions regarding continued access to
the project, contractor availability, assay laboratory turnaround times, geological continuity and commodity
prices. Such information is subject to known and unknown risks, uncertainties, and other factors that may
cause actual results to differ materially from those expressed or implied, including drilling results,
geological and resource estimation uncertainty, commodity price fluctuations, regulatory and permitting
risks, and general economic conditions. A Preliminary Economic Assessment is preliminary in nature,
includes Inferred Mineral Resources considered too speculative geologically to be categorized as Mineral
Reserves, and there is no certainty that results of the PEA will be realized.
There is no certainty that any Inferred Mineral Resource will be converted to the Indicated
category, or that any mineral resource will be converted to a mineral reserve. Mineral resources
that are not mineral reserves do not have demonstrated economic viability. Inferred Mineral
Resources are considered too speculative geologically to have the economic considerations
applied to them that would enable them to be categorized as mineral reserves.
Forward-looking information is made as of the date of this news release and is qualified in its
entirety by the foregoing cautionary statements. Readers are cautioned not to place undue
reliance on forward-looking information. The Company does not undertake to update forward-
looking information, whether as a result of new information, future events or otherwise, except
as required by applicable securities law.
Neither the TSX Venture Exchange nor its Regulation Services Provider accepts responsibility for the
adequacy or accuracy of this news release.