Mammoth Provides Update ON Field Activities at Its Tenoriba GOLD-Silver Property, Mexico

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FOR IMMEDIATE RELEASE: September 22, 2026 No. 06/26

MAMMOTH PROVIDES UPDATE ON FIELD ACTIVITIES

AT ITS TENORIBA GOLD-SILVER PROPERTY, MEXICO

Toronto, Canada, September 22, 2026 - Mammoth Resources Corp. (TSX-V: MTH) (the

“Company” or “Mammoth”) is pleased to provide an update on its field activities at its 100% owned

Tenoriba gold-silver project, Chihuahua State, Mexico. Company geologists and a consulting

metallurgist were recently on-site at Tenoriba with the intention of: (1) reviewing drill core from its 55

prior diamond drill holes, (2) assess the state of access roads from Mammoth's camp-core storage area

to the three primary mineralized areas, including the large 1.5 km by 500 metre (m) Carneritos area,

together with the Masuparia and the Moreno areas, (3) assess drill pad access and locations for its

permitted Phase 1, 60 hole maiden mineral resource, diamond drill program (refer to press release

dated April 16, 2026), (4) to collect up to a 200 kilogram (kg) sample from the previously announced

(press release dated February 26, 2926) potential draw point areas within the large Carneritos area at

Tenoriba for advanced production size, coarser fraction vat and column and leach tests as an advanced

step to designing initial, small-scale, gold-silver leaching of oxidized gold- silver mineralized material,

and (5) liaise with community members and discuss the renewal of surface access agreements.

Over the past weeks, the geological team and consulting metallurgist have reviewed the diamond drill

core as a means by which to orient the consulting metallurgist to the nature of gold-silver mineralization

at Tenoriba to guide the collection of the 200 kg metallurgical test sample.

Roads from camp to the three mineralized areas were observed to be in decent condition, and an

alternative route to these areas was discussed which could provide improved ease of access in all

weather conditions (prior/current access was/is often compromised during periods of heavy rain), but

which would require some work at a cost to Mammoth and it is intended to estimate the availability of

equipment, timing and cost to enable access via this route.

Drill pad locations and access to designated locations for Phase 1 maiden resource drilling did not

appear to be unduly complicated, and the team collected the requisite 200 kg sample, observing in a

field panning trial a couple of small flecks of visible gold within this material. The sample has been

transported to the metallurgical laboratory at the Universidad de Sonora in Hermosillo, Sonora, for

processing.

Mammoth personnel received a cordial reception from the community members and representatives it

met, and the Company looks forward to further dialogue towards a surface access agreement.

Richard Simpson, Vice President Exploration of Mammoth Resources, commented on the field

activities, stating: "It was terrific to be back in the field at Tenoriba working to advance steps towards

drilling what we believe has the potential to be a significant maiden mineral resource at Tenoriba.

Access to the Carneritos area wasn't in too bad shape. We'll have to do some rehabilitation, but that

was expected. We're also looking at alternative access, but this access will also need some work, and

we'll decide among the alternatives as we look at more advanced mobilization. We collected our 200 kg

metallurgical test sample and saw some visible gold within this material, which bodes well for it being of

a grade which will assist us in our metallurgical tests. These tests on this coarser material that could be

expected in actual production will give us the confidence we ultimately need to further advance small-

scale production and a segue to commercial-scale production at Tenoriba."

The metallurgical testing will involve a number of steps, all advancing confidence to an initial small-

scale production decision. The steps are planned to include: (1) initial confirmation that the grade of the

metallurgical sampled material, crushed to less than or equal to one and a half inches in size, blended

and samples taken of this crushed/blended material, conforms to the average grade of material at

Tenoriba from thousands of surface and drill core samples; (2) once the grade is confirmed, initial small-

scale cyanide, together with other more ecologically friendly reagent, small vat leach tests will be

performed to determine the speed and percent recovery of gold and silver in these vats (a vat of

material saturated in a vat with cyanide or other reagent, simulating a saturated leach pad and/or vat);

(3) with step two confirming attractive recoveries, initial column tests are planned to be performed on

this/similar material to determine speed and percent recovery of gold and silver in columns simulating

the height of leach pad levels. Testing more ecologically friendly, non-cyanide alternatives has the

potential benefit of being equally economical while being quicker to permit versus permitting cyanide

leaching of gold-silver.

In addition to testing the rate and percentage of gold-silver recovery during the metallurgical test

program, the measures of cyanide, or other more ecologically friendly reagent consumption, acidity and

other chemical dynamics of leaching will be measured to best understand leach performance. It should

be noted that initial vat leaching of material could segue to a more efficient means of permitting small-

scale, pilot gold-silver production. Permitting options will be investigated as results of the metallurgical

testing become available.

Mammoth looks forward to reporting on additional progress in this work as results become available.

Quality Assurance and Quality Control (QA/QC):

All data used for the drill spacing study followed QA/QC controls as outlined on the Mammoth Resources website

“News”, and drill results press releases spanning the period November 18, 2021, to December 15, 2022.

Qualified Person(s)/Competent Person(s) (QP/CP):

Richard Simpson, P.Geo., Vice-President Exploration for Mammoth Resources Corp. is Mammoth's

QP/QC under National Instrument 43-101 by virtue of his professional designation, university degree

and years of work experience as a geologist and is responsible for and has reviewed and approved all

technical data in this release (refer to Mammoth’s website “Projects”, “Qualified Person/Competent

Person” section for Mr. Simpson’s qualifications).

About Mammoth Resources:

Mammoth Resources (TSX-V: MTH) is a precious metal mineral exploration Company focused on

acquiring and defining precious metal resources in Mexico and other attractive mining-friendly

jurisdictions in the Americas. The Company holds a 100% interest (subject to a 2% net smelter royalty

purchasable anytime within two years from commencement of commercial production for US$1.5

million) in the 5,333-hectare Tenoriba gold property located in the Sierra Madre Precious Metal Belt in

southwestern Chihuahua State, Mexico. Mammoth is seeking other opportunities to option exploration

projects in the Americas on properties it deems to host above-average potential for economic

concentrations of precious metals mineralization. Mammoth recently entered into a strategic alliance

with RM Mineria S de RL de CV of Mexico to pursue additional advanced development and near-term

production opportunities in Mexico.

To learn more about Mammoth Resources and to sign up to receive future press releases, please visit

the company's website at: www.mammothresources.ca., or contact Thomas Atkins, President and

CEO at: 416 509-4326.

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.

Forward Looking Information: This news release may contain or refer to forward-looking information. All

information other than statements of historical fact that address activities, events or developments that the

Company believes, expects or anticipates will or may occur in the future are forward-looking statements;

examples include the listing of its shares on a stock exchange and establishing Mineral Resources. These

forward-looking statements are subject to a variety of risks and uncertainties beyond the Company's ability to

control or predict that may cause actual events or results to differ materially from those discussed in such forward-

looking statements. Any forward-looking statement speaks only as of the date on which it is made and, except as

may be required by applicable securities laws, the Company disclaims any intent or obligation to update any

forward-looking statement, whether a result of new information, future events or results or otherwise. Although the

Company believes that the assumptions inherent in the forward-looking statements are reasonable, forward-

looking statements are not guarantees of future performance and, accordingly, undue reliance should not be

placed on these forward-looking statements due to the inherent uncertainty therein.