(via TheNewswire)

Toronto, Canada, August 27, 2026 - TheNewswire - Mammoth Resources Corp. (TSX-V: MTH) (the “Company” or “Mammoth”) is pleased to announce that it has begun field activities at its 100% owned Tenoriba gold-silver project, Chihuahua State, Mexico.

Company geologists and a consulting metallurgist are on site with the intention of: (1) reviewing drill core from its 55 prior diamond drill holes distributed over an approximately 4 kilometre (km) strike length in three primary gold, silver and occasionally copper mineralized areas where a combination of thousands of soil, surface chip and channel samples occurs with the diamond drilling in a high sulfidation geological system, (2) assess the state of access roads from camp and Mammoth’s 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) and (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.

Thomas Atkins, President and CEO of Mammoth Resources, commented on Mammoth's return to the field, stating : "We're excited to be on the ground at Tenoriba working to advance steps towards drilling what we believe could be a substantial maiden mineral resource at Tenoriba while at the same time also assessing a significantly advanced step to understanding gold-silver recoveries via a columns simulating material coarseness and leach pad dynamics in a production-like leaching scenario.

The Company looks forward to providing additional updates as this work is completed and we consider next steps towards maiden resource definition drilling and initial pilot-scale production at Tenoriba.

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 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 in pursuit of additional advanced development and near-term production opportunities in Mexico.

To find out 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.

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