Omai Increases Indicated Mineral Resources to 2.1 Moz Au (2.07 g/t Au, 31.9mt) and Inferred Mineral Resources to 4.4 Moz Au (1.95 g/t Au, 69.6Mt) With Expansion of Wenot Deposit
Omai Increases Indicated Mineral Resources
to 2.1 Moz Au (2.07 g/t Au, 31.9mt) and Inferred
Mineral Resources to 4.4 Moz Au (1.95 g/t Au,
69.6Mt) With Expansion of Wenot Deposit
Toronto, Ontario--(Newsfile Corp. - August 25, 2025) -
Omai Gold Mines Corp.
(TSXV: OMG) (OTCQB:
OMGGF) ("Omai Gold" or the "Company") is pleased to report an updated Mineral Resource Estimate
("MRE") on its 100%-owned Omai Gold Property in Guyana. The MRE includes an expansion to the
Wenot Deposit and incorporates the previously disclosed Gilt Creek Deposit. Most significantly, for the
Wenot Mineral Resource Estimate ("MRE"), the Inferred MRE increased 130% to 3,717,000 oz grading
1.82 g/t Au, contained in 63.4 million tonnes (“Mt”), and the Indicated MRE increased 16% to 970,000 oz
grading 1.46 g/t Au, contained in 20.7 Mt.
HIGHLIGHTS:
The Omai Property hosts two orogenic gold deposits: the shear-hosted
Wenot Deposit
and the
adjacent intrusive-hosted
Gilt Creek Deposit
(
Figure 1
), with a combined updated MRE (over the
February 2024 MRE) of:
2,121,000 ounces of gold
(Indicated MRE), a 7% increase, averaging
2.07 g/t Au in 31.9Mt
&
4,382,000 ounces of gold
(Inferred MRE), a 92% increase, averaging
1.95 g/t Au in 69.6Mt
Wenot Deposit
(a constrained pit and underground approach is applied)
970,000 oz
of gold in
20.7Mt
(Indicated), a 16% increase in ounces over the Feb 2024 MRE
3,717,000 oz
of gold in
63.4Mt
(Inferred), a 130% increase in ounces
1.46 g/t Au
grade of Indicated MRE, a 1.4% decrease*
1.82 g/t Au
grade of Inferred MRE, an 8.5% decrease*
*Increased gold price assumption to $2,500/oz from $1,850/oz allowed cutoff lower to 0.30 g/t Au from 0.35 g/t Au, resulting in lower
average grades however increased ounces
~60% above 350m depth from surface
(Figure 2a)
~30% of Wenot MRE is west of the historical open pit, an area considered to be well suited to
initial mining (
Figure 2b
)
Expansion potential is evident along a minimum 2.5 km length of the host Wenot shear corridor,
including within, adjacent to, below, and along strike
Gilt Creek Deposit
(an underground mining approach is applied)
1,151,000 ounces
of gold (Indicated) averaging
3.22 g/t Au
, in 11.1Mt (Feb 2024 MRE)
665,000 ounces
of gold (Inferred) averaging
3.35 g/t Au
, in 6.2Mt (Feb 2024 MRE)
Hosted within a 500m by 300m quartz diorite intrusive "Omai stock" that produced 2.4 million
ounces of gold (1993 to 2005) from the upper 250m
Located 500m north of the Wenot Deposit and below the past-producing Fennel open pit
Characterized by very wide sub-horizontal zones of gold mineralization
(Figure 5)
Open to depth and holds demonstrated potential for lateral expansion
Elaine Ellingham, President & CEO commented
, "We are pleased to be delivering yet another very
substantial increase to the Mineral Resource Estimate for our Omai Gold Project in Guyana. This
firmly positions Omai as one of the top two largest gold projects in Guyana. Omai has many benefits
as a brownfields project, not the least of which is road access (mostly paved), an airstrip, a cleared
site, established tailings sites and known past production parameters. In addition to these clear
advantages, Guyana has proven to be a favourable jurisdiction, now recognized by the Fraser Institute
as the 9
th
best jurisdiction for mining investment in the world, with a Government and people that are
supportive of large-scale mine development. This updated Mineral Resource Estimate reinforces the
potential for accelerated large-scale mine re-development at Omai, a project that continues to deliver
superior value creation for all stakeholders. With each successive milestone it becomes clearer that
Omai has the potential to be a multi-decade world-class gold mining operation.
Notwithstanding this large gold Mineral Resource Estimate we announced today, we still see very
significant potential to further expand the gold zones at both the Wenot and the Gilt Creek Deposits.
We will continue to aggressively drill to increase these Mineral Resources and to upgrade the Inferred
Mineral Resource Estimate, in order to advance the project towards a Feasibility Study later in 2026.
Two drills are currently turning on nearby known gold occurrences, exploring for near-surface satellite
deposits, while the third drill continues on a deep hole (25ODD-122) that drilled across the Gilt Creek
Deposit and continues, with the goal of testing the blue sky depth potential of the adjacent Wenot
Deposit."
Figure 1. 3D Model of Wenot Shear-Hosted Deposit and Gilt Creek Intrusion-Hosted Deposit
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/8712/263731_7c6565f1f490ebe2_001full.jpg
Details of the Mineral Resource Estimate for both the Wenot (updated) and Gilt Creek Deposits are
presented in Table 1.
The increase in the updated Wenot MRE over the previous February 2024 MRE is
detailed in a comparison in Table 2.
Notes accompanying the 2025 MRE are shown below Table 2,
summarizing the economic and technical assumptions, which include a gold price of US$2,500 per
ounce and metallurgical recoveries of 92% (consistent with historical actuals).
Table 1.
2025 (August) Mineral Resource Estimates
Indicated Resources
Inferred Resources
Resource Area
Mining
Method
Tonnes
(k)
Au
(g/t)
Au
(koz)
Tonnes
(k)
Au
(g/t)
Au
(koz)
GILT CREEK
(1.5 g/t Cut-Off)
Underground
11,123
3.22
1,151
6,186
3.35
665
WENOT Pit
(0.20
& 0.30 g/t Cut-
Off)
Open Pit
20,713
1.46
969
62,299
1.78
3,565
WENOT
Out-of
Pit
(1.5 g/t Cut-Off)
Underground
16
2.14
1
1,147
4.13
152
Total Mineral Resource Estimate
31,852
2.07
2,121
69,632
1.95
4,382
Wenot Pit-Constrained Mineral Resource Estimate by Mineralization Type
WENOT
Saprolite &
Alluvium
Open Pit
0.20 g/t
Cut-Off
1,819
0.94
55
417
1.69
23
Fresh Rock &
Transition
Open Pit
0.30 g/t
Cut-Off
18,894
1.51
914
61,882
1.78
3,542
Table 2.
Comparison between Wenot 2025 (August) MRE and 2024 (February) MRE
Tonnes (k)
Au (g/t)
Au (koz)
Category
2024
MRE
2025
MRE
Change
(%)
2024
MRE
2025
MRE
Change
(%)
2024
MRE
2025
MRE
Change
(%)
Indicated
17,572
20,729
+18
1.48
1.46
-1.4
834
970
+16
Inferred
25,183
63,446
+152
1.99
1.82
-8.5
1,614
3,717
+130
Notes to Accompany the August 2025 Mineral Resource Estimate:
1
.
Mineral Resources that are not Mineral Reserves do not have demonstrated economic viability.
2
.
The estimate of Mineral Resources may be materially affected by environmental, permitting, legal, title, taxation, socio-political,
marketing, or other relevant issues.
3
.
The Inferred Mineral Resource in this estimate has a lower level of confidence than that applied to an Indicated Mineral Resource and
must not be converted to a Mineral Reserve. It is reasonably expected that the majority of the Inferred Mineral Resource could potentially
be upgraded to an Indicated Mineral Resource with continued exploration.
4
.
The Mineral Resources were estimated in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum (CIM), CIM
Standards on Mineral Resources and Reserves, Definitions (2014) and Best Practices Guidelines (2019) prepared by the CIM Standing
Committee on Reserve Definitions and adopted by the CIM Council.
5
.
Wenot wireframe constrained gold assays were composited to 1.5 metre lengths and subsequently capped between 7 to 28 g/t. Gilt Creek
Wireframe constrained gold assays were composited to 1.0 metre lengths and subsequently capped between 12 to 40 g/t.
6
.
The Wenot Mineral Resource Estimate incorporates 12,028 assay results from 639 diamond drill holes totalling 110,920 m within the
mineralized wireframes.
The Gilt Creek Mineral Resource Estimate incorporates 7,056 assay results from 46 diamond drill holes totalling
27,997 m within the mineralized wireframes.
7
.
Grade estimation was undertaken with ID
3
interpolation.
8
.
Wenot wireframe constrained bulk density was determined from 48 site visit samples.
Gilt wireframe constrained bulk density was
determined from 28 site visit samples.
9
.
Wenot gold process recoveries used were 90% for Alluvium/Saprolite and 92% for Transition/Fresh Rock. Gilt Creek gold process
recovery used was 92%.
10
.
The gold price used was US$2,500/oz.
11
.
Wenot US$ open pit operating costs used were $2.50/t for mineralized material mining, $2.00/t for waste mining, $11/t for
Alluvium/Saprolite processing, $18/t for Transition/Fresh Rock processing and $4/t G&A resulting in respective 0.20 and 0.30 g/t Au cut-
off grades. Wenot and Gilt Creek US$ underground operating costs used were $85/t for mining, $18/t for processing and $7/t G&A
resulting in a 1.5 g/t Au cut-off grade.
12
.
Underground MRE blocks were reviewed for grade and geometric continuity. Isolated/orphaned and single block width strings of blocks
were removed in order to only report Mineral Resources with a reasonable prospect of eventual economic extraction.
13
.
Wenot pit slopes were 55
o
.
Wenot Deposit
This updated Mineral Resource Estimate for the Wenot shear-hosted deposit incorporates a total of 36
new diamond holes (23,597m), for a total of 639 drill holes incorporating 12,028 assay results within the
MRE wireframes. Five drill holes have been completed on the Wenot deposit after the cut off date for the
MRE, with assays pending, and these results will be included in a future MRE.
Additional drilling on
Wenot will commence very shortly aimed at further exploring the limits of the Wenot deposit, since it
remains open in all directions.
Some of this drilling will also start upgrading the large Inferred Mineral
Resource to Indicated.
Figure 2.
Wenot Deposit Block Model - 2a. Longitudinal Projection (W-E) and 2b. Plan View
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/8712/263731_7c6565f1f490ebe2_002full.jpg
The impact of cut-off grade on the Wenot Mineral Resource Estimate size and grades is shown in Figure
3 below, with the full data provided in Table 3.
The cut-off grade was lowered from 0.35 g/t Au in the
2024 MRE to 0.30 g/t Au in the current MRE. This change relates to an increase in the gold price
assumption to $2,500/oz in the current MRE compared to $1,850/oz applied in February 2024.
Operating cost increases were also included. A lowering of the cut-off grade assumes that lower grade
gold can be economically extracted and processed in a higher gold price environment. The spot gold
price has increased over 60% since the previous MRE in February 2024.
Applying a higher cut-off grade for more marginal projects can result in a profound decrease in the
number of ounces in the Mineral Resource. Very significantly for Wenot, Figure 3 shows that by more
than doubling the cut-off grade to 0.75 g/t Au, the number of ounces in the Indicated MRE is reduced only
slightly to 845,000 oz, however at a higher grade 2.0 g/t Au. Further, the Inferred MRE at the same higher
cut-off gives 3,286,000 ounces at a higher grade of 2.21 g/t Au. The overall impact is less than a 10%
reduction in the number of ounces in the overall MRE however the grade of the Indicated MRE increases
by 36% and the grade of the Inferred MRE increases by 24%.
Figure 3.
Chart Showing Impact of Cut-Off Grade on Wenot Pit-Constrained MRE Size and Grades
(see Table 3)
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/8712/263731_7c6565f1f490ebe2_003full.jpg
Gilt Creek Deposit
The Gilt Creek Deposit is hosted by the "Omai Stock", a quartz-diorite intrusive that is extensively
mineralized with gold-bearing quartz vein stockworks hosted within broad sub-horizontal zones as well
as with disseminated gold mineralization within the host intrusive rock (Figure 4). Two-thirds (2/3) of the
Gilt Creek Deposit MRE are Indicated, mostly between 280 to 600m depth, due to higher drill density.
The Indicated MRE stands at 1,151,000 ounces averaging 3.22 g/t Au, contained within 11.1Mt, using a
1.5 g/t Au cut-off.
Historical mining of the uppermost 250m of the deposit from surface produced
approximately 2.4 million ounces
2
.
There remains excellent potential for expansion of the Gilt Creek deposit at depth. The deepest holes
drilled to date (to 967m below surface) still intersect significant gold mineralization, but with only a few,
wide-spaced drill holes. Perhaps more importantly, the potential to expand the gold mineralized intrusive
laterally, at the same depths as the current Gilt Creek MRE was demonstrated by the single drill hole
(24ODD-095) completed on the Gilt Creek Deposit in 2024. The 1,185m long drill hole continued to
intersect the gold-mineralized intrusion, 200m beyond the previously interpreted lateral extent.
Drill hole 24ODD-095 (1,185m) was completed on the Gilt Creek Deposit in late 2024. This drill hole
was drilled mostly to support the design of an underground mine plan for the Gilt Creek Deposit, to be
included in the upcoming PEA. The geotechnical data including RQD (Rock Quality Designation), natural
and mechanical fracture counts, rock hardness and drill core recoveries are being used to estimate the
competency of the rock which are important for the underground mine design. In addition, a downhole
Televiewer system was used that provided visuals and detailed and accurate orientations on structures
which are present in the rock mass. An additional drill hole (25ODD-122) is underway, drilling across the
Gilt Creek Deposit and continuing in order to explore the down dip depth potential of the Wenot gold-
bearing shear system. Results are pending.
No update has been done to the Mineral Resource Estimate as announced in February 2024, since one
additional drill hole was not deemed material to the existing MRE. The Gilt Creek estimation
methodology is detailed in the NI 43-101 Technical Report
1
filed May 21, 2024 on
www.sedarplus.ca
.
The Gilt Creek MRE incorporates 7,056 assay results from 46 diamond drill holes totalling 27,997 m
within the mineralized wireframes.
Figure 1 presents a 3-D model of the Wenot and Gilt Creek Deposits.
Notes accompanying the 2024 MRE, shown below Table 2, summarize the economic and technical
assumptions for the Gilt Creek Deposit, that include a gold price of US$1,850 per ounce and
metallurgical recoveries of 92% (consistent with historical actuals).
The impact of cut-off grade on the Gilt Creek Mineral Resource Estimate size and grades is shown in
Figure 4 below with details on Table 4. Increasing the cut-off grade from 1.5 g/t Au to 2.0 g/t Au
increases the estimated average grade of both the Indicated and Inferred MRE by about 22% to 3.90 g/t
Au (Indicated) and 4.14 g/t Au (Inferred), while reducing the estimated contained ounces by only 17% for
both the Indicated and Inferred Mineral Resource, to 955,000 ounces and 552,000 ounces respectively.
Figure 4.
Chart Showing Impact of Cut-Off Grade on Gilt Creek MRE Size and Grades (data provided in
Table 4)
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/8712/263731_7c6565f1f490ebe2_004full.jpg
Preliminary Economic Assessment ("PEA")
A baseline PEA for Omai was completed in April 2024 and detailed in the NI43-101 Technical Report
1
filed May 21, 2024. It included only a limited open pit operation for Wenot, with production of 1.84 million
ounces of gold over a 13 year mine life, with an after-tax NPV
5%
of $556 million and an IRR of 20% at a
$1,950/oz gold price.
An updated PEA will incorporate th new, much-expanded Wenot MRE plus the
adjacent Gilt Creek Deposit, not previously included. We expect a new mine plan to include a larger
superpit for the Wenot Deposit with later stage underground mining to access the lower parts of the
higher grade, wide "Dike Corridor" zones discovered during the recent Wenot drilling.
A new mine plan
is expected to include the concurrent development of a ramp from surface to access the Gilt Creek gold
Deposit that starts at depths of approximately 280m, with the bulk of the current MRE between depths of
300m to 600m. Work on the updated PEA has commenced and it is expected to be completed in late
2025.
Figure 5.
Cross-Section Projection of Gilt Creek Deposit (Omai Stock- Quartz Diorite Intrusion)
To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/8712/263731_7c6565f1f490ebe2_005full.jpg
As a corporate update, the Company also reports that David Stewart is no longer with the Company, and
we wish him the best in his future endeavours.
1
NI 43-101 Technical Report dated May 21, 2024 "UPDATED MINERAL RESOURCE ESTIMATE AND PRELIMINARY ECONOMIC ASSESSMENT
OF THE OMAI GOLD PROPERTY, POTARO MINING DISTRICT NO.2, GUYANA" was prepared by Eugene Puritch, P.Eng., FEC, CET, President
of P&E Mining Consultants Inc. is available on SEDAR+ and on the Company's website. It includes a Wenot Mineral Resource Estimate of 834,000
indicated ounces of gold averaging 1.48 g/t Au within 17.6 million tonnes and 1,614,000 Inferred ounces of gold averaging 1.99 g/t Au within 25.2
million tonnes, and the adjacent Gilt Creek Mineral Resource Estimate of 1,151,000 Indicated ounces of gold averaging 3.22 g/t Au within 11.1
million tonnes and 665,000 Inferred ounces of gold averaging 3.35 g/t Au within 6.2 million tonnes.
2
Past production at the Omai Mine (1993-2005) is summarized in several Cambior Inc. documents available on
SEDARplus.ca
, including March
31, 2006 AIF and news release August 3, 2006.
Quality Control
Omai maintains an internal QA/QC program to ensure sampling and analysis of all exploration work is
conducted in accordance with best practices. Certified reference materials, blanks and duplicates are
entered at regular intervals. Samples are sealed in plastic bags.
Drill core samples (halved-core) were shipped to ActLabs and some batches to MSALABS, both
certified laboratories in Georgetown Guyana, respecting the best chain of custody practices. At the
laboratory, samples are dried, crushed up to 80% passing 2 mm, riffle split (250 g), and pulverized to
95% passing 105 μm, including cleaner sand. Fifty grams of pulverized material is then fire assayed by
atomic absorption spectrophotometry (AA). Initial assays with results above 3.0 ppm gold are re-
assayed using a gravimetric finish. For samples with visible gold two separate 250g or 500g pulverized
samples are prepared, with 50 grams of each fire assayed by atomic absorption spectrophotometry,
with assays above 3.0 ppm gold being re-assayed using a gravimetric finish. Certified reference
materials and blanks meet with QA/QC specifications.
Qualified Persons
Elaine Ellingham, MSc PGeo and Eugene Puritch, P.Eng., FEC, CET, President of P&E Mining
Consultants Inc., both Qualified Persons (QPs) under National Instrument 43-101 "Standards of
Disclosure for Mineral Projects", have approved the technical information contained in this news release.
Ms. Ellingham is not considered to be independent for the purposes of National Instrument 43-101. Mr.
Puritch is independent of Omai Gold Mines Corp.
About Omai Gold Corp.
Omai Gold Mines Corp. is a Canadian gold exploration and development company focused on rapidly
expanding the two orogenic gold deposits at its 100%-owned Omai Gold Project in mining-friendly
Guyana, South America. The Company has established the Omai Gold Project as one of the fastest
growing and well-endowed gold camps in the prolific Guiana Shield greenstone belt. In February 2024
the Company announced an updated NI 43-101 Mineral Resource Estimate1 ("MRE") that is filed on
www.sedarplus.ca
. This was followed by an initial baseline Preliminary Economic Assessment ("PEA")
in April 2024, which contemplated an open pit-only development scenario and included only 45% of the
Omai Gold Project MRE. Subsequent to the 2024 MRE, the Company has been aggressively drilling to
expand gold Mineral Resources at the Wenot Deposit and has identified additional wide zones of high-
grade gold mineralization. The current news release announces an updated MRE and work has
commenced towards an updated PEA for late 2025.
Omai Gold's plans for 2025 were to continue its impactful drill programs, announce an updated and
expanded MRE (now done), and complete an updated PEA which would include an expanded Wenot
open pit deposit and an underground mining scenario at Gilt Creek. The Omai Gold Mine produced over
3.7 million ounces of gold from 1993 to 2005
2
, ceasing operations when gold was below US$400 per
ounce. The Omai site benefits from much existing infrastructure and will soon be connected to the two
largest cities in Guyana, Georgetown and Linden, via paved road.
For further information, please see our website
www.omaigoldmines.com
or contact:
Elaine Ellingham, P.Geo.
President & CEO
+1.416.473.5351
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
release.
Cautionary Note Regarding Forward-Looking Statements
This news release includes certain "forward-looking statements" under applicable Canadian securities
legislation. Forward-looking statements include, but are not limited to, statements with respect to the