Mammoth Announces Gold Recoveries Of 87% From Bottle Roll Tests On Coarser-Fraction Material From The Large Carneritos Area On Its Tenoriba Gold-Silver Property, Mexico

(TheNewswire)

Toronto, Canada(February5, 2026) –TheNewswire - Mammoth Resources Corp. (TSX-V: MTH), (the“Company”, or“Mammoth”) is pleased to announce results from bottle roll testsperformed on a coarser fraction composite sample of oxidizednear-surface gold-silver mineralized material collected from assayreject samples of drill holes from the 2021-22 drill campaign, withinthe large Carneritos area at its 100% owned Tenoriba project,Chihuahua State, Mexico.

Gold recoveries in a bottle roll test of this coarser fraction,oxidized material passing -10 mesh, or 20 times coarser than materialpreviously sampled in preliminary metallurgical testing from this samecomposite sample, gave recoveries of 87% gold and 67% silver, resultsof which compare favourably to gold recoveries rangingfrom 75% to 90% and silver recoveries around 65% in initial,finer fraction bottle roll testing (refer to press release on theCompany’s web site dated November 9, 2023 ). The majority of thegold and silver leaches within the first 12 hours of a total of a96-hour test. Moving to a coarser fraction, 20 times coarser thanprior testing, bodes well for what we can expect from further testingas we advance to small-scale, pilot mineral extraction and heap leachtesting as a step towards a future full-scale operation.

Thomas Atkins, President and CEO ofMammoth Resources, commented on these results, stating: "The Mammothteam is excited and encouraged by these results. Gold and silverrecoveries in this recent testing are near 90 and 70 percent,respectively. Such recoveries bode well for the ability to recovergold and silver through heap leach processing in the near-surface,shallow oxidized horizon at Tenoriba.”

The gold-silver recoveries from thisstep-up in grain size are ten times coarser than the materialpreviously tested and we’ve achieved the same elevated gold-silverrecoveries we achieved from initial testing. Mammoth personnel and theprofessional evaluating these test results believe such recoveries area good indication of the potential for similar elevated gold andsilver recoveries in this material as we continue confirmation teststowards pilot and commercial scale production. We had similargold-silver recoveries in initial fine-fraction leach testing frommaterial collected from historical drilling in the large 1,200 by 250metre Masuparia area at Tenoriba. That the Carneritos area measuresapproximately 1,500 by 500 metres and that we’re getting such highgold-silver recoveries in the oxidized, near-surface level ofmineralization at Carneritos is an indication of the potential of theproject for future, low-cost precious metal production.

We’re now advancing a number ofactivities at Tenoriba, including: confirming locations ofhigher-than-average grade material in the near-surface oxidized zonesfor potential extraction and processing in a small, pilot plant-scaleoperation, column testing of even coarser fraction material fromCarneritos as a lead-up to the pilot plant and seeking an updatedquote on our phase one, shallow oxidized horizon drilling to define amaiden mineral resource at Carneritos. We look forward to reporting onthese activities in the near future.”

Cyanide Bottle Roll Test Results,Conclusions and Recommendations for Future Work:

All samples are from reject samples ofcore drilled during the 2021-22 drill campaign within the Carneritosarea of the Tenoriba project and had grades approximating 0.65 gramsper tonne gold equivalent grade (combined gold and silver with silvergrade converted to gold at a 75:1 silver to gold ratio), which is theaverage assayed grade among all mineralized drill core intervalsgrading higher than 0.18 grams per tonne gold from within theCarneritos area. This report describes the rationale, method of samplecollection, quality control and quality assurance measures, theresults obtained from these tests and studies, and recommendations forfurther work.

All cyanide bottle roll tests were performed at the SGS Laboratory inDurango, Mexico, supervised by German Alarcon, SGS de Mexico S.A deC.V metallurgist and a qualified person. Mammoth Resources personnelperformed the sample selection under the supervision of RichardSimpson, Vice President of Exploration for Mammoth Resources, aprofessional geologist and qualified person at Mammoth Resources.

Gold dissolution recovery (amount of golddissolved-recoverable relative to the assayed grade) from thecoarser fraction, minus 10-mesh, bottle roll test of compositeoxidized coarser-grained material is 87%, and silverrecovery is 67%. These amounts compare favourably to gold recoveries ranging from 75%to 90% and silver recoveries around 65% forbottle roll tests conducted on fine-grained (minus 200-mesh) oxidizedmaterial, with most of the gold and silver dissolved/recoverablewithin the first 12 hours. Considering the coarse-grained nature ofthe material tested, cyanide consumption (0.2 kg/t) is considered low,while CaO consumption (3.8 kg/t) is considered on the higher end ofaverage.

Sample Grade, Dissolution, and Reagent Consumption

Recommendations forfuture work include additional metallurgical testing on, among others,even coarser-grained, near-surface oxidized and oxidized-transitionzone material, possibly in bottle roll tests, or column tests.Sulfide-bearing material should also undergo additional testing tounderstand leaching kinetics, including bottle roll tests with highercyanide concentrations to determine whether, with changes to theleaching dynamics, recoveries can be improved.

Additional testing would include samples from portionsof the drill core, or extracted from surface “draw-points” tocreate a similarly representative near-surface,oxidized–oxidized/transition sample(s) and from drill core toextract a sample(s) of deeper, below the oxidized material level,sulfide sample. This material should be crushed and screened for thedesired 3/8-inch diameter size fraction, followed by column testing todetermine leach kinetics. These tests would further validate andenhance the confidence of the metallurgical recoveries of gold andsilver by cyanide heap leach methods, plus the consumption of reagentsto achieve the most favourable gold and silver recoveries and thepotential economics of this process.

Based on the success of this recent testing, Mammoth intends tocollect sample(s) to further this metallurgical testing on a 3/8-inch,coarser fraction of the oxidized and mixed oxidized-sulfide zonematerial. As this near-surface material will be the first to beextracted in any mining operation and has such favourable leachingkinetics, this material will be the priority for near-term, futuretesting. Additional testing of sulfide material will be conducted atthe appropriate time relative to the definition of this materialwithin the deposit.

Mammoth intends to post to its website (“Projects”,“Technical Reports” section) in the coming days a technical reportdetailing this coarser fraction oxidized material and preliminarysulfide, metallurgical study.

The Company looks forward to reporting on additionaldevelopment activities at Tenoriba, including additional metallurgicaltesting and resource definition drilling.

Quality Assurance and Quality Control(QA/QC):

Samples were selected from sample rejects of drill corerecovered by Mammoth Resources personnel from Australian LaboratoryServices (ALS) preparation laboratory, Chihuahua where they hadoriginally been prepared for drill core assay analysis of drill holesdrilled within the Carneritos area of the Tenoriba property during the2021-2022 diamond drilling program. Drill core assay results, plusQuality Assurance/Quality Control (QA/QC) measures were previouslyreported in various press releases (refer to Mammoth Resources websitepress releases spanning the period November 18, 2021, to December 15,2022).

Sample selection and preparation for cyanide bottle roll testing wereperformed by Mammoths personnel under the supervision of RichardSimpson at the Chavez ranch outside of Chihuahua city, Chihuahua,Mexico. Details of sample preparation are provided in the reporttitled: “Report on Bottle Roll Tests of Coarse Oxidized, and FineSulfide-Bearing Drill Core Reject Samples, Carneritos Area of theTenoriba Project, Chihuahua, Mexico, December 2025”, posted toMammoth’s website: Project section, Technical Reports.  

Qualified Person / Quality Controls:

Richard Simpson, P.Geo., Vice-PresidentExploration for Mammoth Resources Corp. is Mammoth's QualifiedPerson under National Instrument 43-101 by virtue of his professionaldesignation, university degree and years of work experience as ageologist and is responsible for and has reviewed all technical datain this release (refer to Mammoth’s website “Projects”,“Qualified Person” section for Mr. Simpson’s qualifications).

German Alarcon, Metallurgist for SGS de Mexico S.A deC.V. is an experienced metallurgist. Mr. Alarcon graduated in 2007from the Faculty of Chemistry at the Universidad del Estado deDurango, Mexico as an Ingeniero en Ciencias de los Materiales. Sincegraduating in 2007, Mr. Alarcon has worked as a metallurgist fornumerous reputable organizations, including Minerales y Minas deMexico and First Majestic Silver Corp. Since 2018 Mr. Alarcon has beenthe Metallurgical Laboratory Manager for SGS in Durango, Mexico. Mr.Alarcon is a Qualified Person under NI 43-101 by virtue of hisuniversity degree and years of experience as a metallurgist.

Dr. Efren Perez, PhDGeology, is a consulting geologist. From 1977 to2022 Dr. Perez was a professor of Economic Geology at the Universidadde Sonora, Mexico. Dr. Perez received his PhD in 2006 from theUniversidad de Mexico (UNAM). His post graduate studies are from theEcole Nacionale Superieure des Mines de Paris, France (1975-1976) andEcole Nationale Supérieure de Géologie Appliquée et de ProspectionMinière, Nancy, France (1977-1979). Dr. Perez is a Qualified Personunder NI 43-101 by virtue of his university degrees, academic studiesand years of experience as a professor of Economic Geology at theUniversidad de Sonora.

About Mammoth Resources:

Mammoth Resources (TSX-V: MTH) is a precious metalmineral exploration Company focused on acquiring and defining preciousmetal resources in Mexico and other attractive mining-friendlyjurisdictions in the Americas. The Company holds a 100% interest(subject to a 2% net smelter royalty purchasable anytime within twoyears from commencement of commercial production for US$1.5 million)in the 5,333-hectare Tenoriba gold property located in the SierraMadre Precious Metal Belt in southwestern Chihuahua State, Mexico.Mammoth is seeking other opportunities to option explorationprojects in the Americas on properties it deemsto host above-average potential for economic concentrations ofprecious metals mineralization. Mammoth recently entered into astrategic alliance with RM Mineria S de RL de CVof Mexico in pursuit of additional project developmentopportunities.

To find out more about Mammoth Resources and to sign up to receivefuture press releases, please visit the company's website at: www.mammothresources.ca., or contact Thomas Atkins, President andCEO 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 maycontain or refer to forward-looking information. All information otherthan statements of historical fact that address activities, events ordevelopments that the Company believes, expects or anticipates will ormay occur in the future are forward-looking statements; examplesinclude the listing of its shares on a stock exchange and establishingmineral resources. These forward-looking statements are subject to avariety of risks and uncertainties beyond the Company's abilityto control or predict that may cause actual events or results todiffer materially from those discussed in such forward-lookingstatements. Any forward-looking statement speaks only as of the dateon which it is made and, except as may be required by applicablesecurities laws, the Company disclaims any intent or obligation toupdate any forward-looking statement, whether as a result of newinformation, future events or results or otherwise. Although theCompany believes that the assumptions inherent in the forward-lookingstatements are reasonable, forward-looking statements are notguarantees of future performance and, accordingly, undue relianceshould not be placed on these forward-looking statements due to theinherent uncertainty therein.

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