Americas Gold and Silver Achieves Breakthrough with 99%+ Antimony Extraction from Its Copper Concentrate, Supporting Potential Primary Production in the United States

WALLACE, IDAHO – September 8, 2025 – Americas Gold and Silver Corpora�on (NYSE American: USAS) (TSX: USA) (“Americas” or the “Company”), a growing North American precious and cri�cal metals producer, is pleased to announce updated results from recent metallurgical tes�ng on an�mony contained in its copper concentrates generated during the first phase of the test program at its Galena Complex in Idaho. The tes�ng, conducted by Allihies Engineering Inc. (“Allihies”) using its proprietary, selec�ve industrial Alkaline Selec�ve Leaching (ASL) hydrometallurgical technology, confirms very high extrac�on rates of an�mony are possible. The ASL technology u�lized by Allihies represents an improved and op�mized version of the proven industrial process used for 60 years by Sunshine Mining at its an�mony plant that existed un�l 2002 before it was demolished. This result demonstrates the poten�al to unlock significant untapped value from currently unpaid by-products and posi�ons the Company as a poten�al frontrunner in restoring domes�c an�mony product supply. For reference, an�mony has been iden�fied as a cri�cal mineral essen�al for U.S. na�onal security and economic resilience in addi�on to both silver and copper.

Metallurgical Breakthrough Unlocks An�mony and Gold Value

Americas is celebra�ng a major milestone in metallurgical innova�on at the Galena Complex. Recent test work has confirmed the poten�al to extract over 99% of an�mony from the site's copper flota�on concentrate, transforming a historically overlooked by-product into a valuable revenue source while bolstering the Company's role in the domes�c supply of cri�cal minerals. An�mony flota�on recovery rates from the copper/silver tetrahedrite ore grading 1% an�mony is between 90-96%.

An�mony at the Galena Complex is hosted in the common sulfosalt mineral, tetrahedrite, which is an an�mony sulfide of silver, copper, and iron. Although the Galena Complex has produced significant an�mony over its life, the Company historically has not realized value for this material due to its then insufficient concentra�on and quality for smelter acceptance.

As previously announced (see the Company’s press release dated May 15, 2025), the Company commissioned SGS Canada Inc. (“SGS”) to conduct flota�on tests on current mill feed. There were two objec�ves to this first phase of test work:

1. Confirm that a copper/an�mony/silver flota�on product could be achieved from the tetrahedrite ore being processed through the Galena mill.

2. Generate sufficient flota�on concentrate for addi�onal tes�ng to extract an�mony from the concentrate.

Phase One – Flota�on recovery from tetrahedrite ore highlights:

• An�mony Recovery: ~90 - 96% from ore grading ~1% Sb
• Silver Recovery: ~98 - 99% from ore grading ~50 oz/ton Ag
• Copper Recovery: ~96 - 98% from ore grading ~1% Cu
• Rougher Concentrate Grades: ~18 - 19% Sb, ~600 opt Ag & 24% Cu

Phase Two – ASL Hydrometallurgical recovery from copper concentrate highlights:

• An�mony Extrac�on: +99% from flota�on concentrate grading ~19% Sb
• Arsenic Extrac�on: +72% from flota�on concentrate
• Silver, copper and iron: completely retained in the leached flota�on concentrate at an enhanced grade
• Gold Extrac�on: between 25-60% from flota�on concentrate

Paul Andre Huet, Chairman and CEO, commented: “I am thrilled that results of our test work have successfully demonstrated the poten�al to extract over 99% of the an�mony from the copper ore currently being mined at our Galena Complex. At current Ro�erdam an�mony prices, this breakthrough could significantly enhance the payable metal value for Americas and our shareholders, as we currently receive li�le to no revenue for the an�mony in our exis�ng produced concentrates. Our technical team is moving forward with detailed technical and trade-off studies to develop a plan to rapidly capitalize on the opportunity to commercially recover and realize value for the an�mony, gold and copper already present in our concentrates. Over the last nine months, we have been able to unravel the an�mony puzzle at the Galena mine. I am very excited to deliver this news to our shareholders and the market generally – we are working to gather more informa�on on our growing poten�al to become the first mine to-market an�mony produc�on in the U.S. in the last 25 years. We believe that we are the only US-based mining company that is producing extractable silver, copper, and an�mony, metals that the United States government has iden�fied as cri�cal, strategic metals.”

The results from the first phase of test work conducted on the tetrahedrite material indicate that a marketable copper concentrate is possible using modern metallurgical processes. This was a very posi�ve first step.

Building on the results of the first phase of metallurgical test work, the second phase conducted at Allihies Engineering, Inc., focused on trea�ng the copper concentrate from the first phase to produce a saleable an�mony product. Such a product would open the door to mone�ze a long-overlooked by-product and reinforce the Company's strategic value within the U.S. cri�cal minerals supply chain by genera�ng mul�ple an�mony products, all produced in the Silver Valley of Idaho.

This second phase involved conduc�ng tests on the copper concentrate to determine the extrac�on rate of an�mony and gold. The result was over 99% extrac�on of the an�mony was achieved, with the copper and silver metal remaining in the concentrate. Results are shown in the tables below.

Table 1: ASL Hydrometallurgical Leaching Test Results

Allihies Engineering Inc. commented: “We have successfully op�mized and applied our proprietary ASL technology to two rougher copper concentrates from the Galena Mine. At equilibrium, nearly 100% of the contained an�mony was successfully leached from both copper concentrates. This leached an�mony can be processed into high purity an�mony metal, sodium an�monate, an�mony oxide and an�mony sulfides. Gold successfully leached can also be recovered. Very importantly, the arsenic concentra�on of the flota�on concentrate was drama�cally reduced with the leached arsenic poten�ally being selec�vely fixed as an iron compound for subsequent disposal. Finally, silver, copper and iron were all retained completely in the leached concentrate at an enhanced grade. Overall, this is a tremendous result for maximizing the mone�za�on of an�mony in ore already being mined at Galena”.

Background: Historical An�mony Produc�on at Galena Complex

As shown in the table below, over 20 million pounds of an�mony have been produced historically from the Galena Complex since 2001, based on final smelter se�lement sheets. For many years during the period since 2001, the focus was on producing from non-tetrahedrite ore sources. Recent drilling since 2019 shows a large increase in the tetrahedrite ore which will become a focus for drilling and produc�on going forward. If the poten�al for commercial recovery and product refinement can be realized, Americas Gold and Silver is posi�oned to become the only an�mony end product supplier in the United States. This milestone would represent a significant development in restoring domes�c supply of a mineral deemed essen�al to U.S. na�onal and economic security since China halted an�mony exports, announcing it was no longer selling to the U.S. on December 3, 2024.

Table 2: Galena Mill Historical Produc�on Based on Final Smelter Se�lements (before payable deduc�ons)

As shown in the table above, the amount of recovered an�mony as compared to the recovered copper in the Galena flota�on concentrate historically has been approximately 0.69-to-1. A�er recognizing this rela�onship earlier in the year, the Company sent out approximately 1,000 drill sample rejects from the tetrahedrite veins for analysis. Each sample was analyzed for copper and an�mony. Table 3 is a summary of the results from this test work (detailed results are in the appendix to this report).

Table 3: Summary of Assay Results

These assay results indicate an an�mony-to-copper ra�o in the tetrahedrite ore that is approximately 0.64-to-1 (versus 0.69-to-1 reflected in the above historical results). An�mony and copper is predominantly hosted in the tetrahedrite ore at Galena, however, a small por�on of the non-tetrahedrite material also hosts an�mony and copper, boos�ng overall an�mony produc�on poten�al.

About Americas Gold and Silver Corpora�on

Americas Gold & Silver is a growing precious metals mining company with mul�ple assets in North America. In December 2024, Americas increased its ownership in the Galena Complex (Idaho, USA) from 60% to 100% in a transac�on with Eric Spro�, solidifying its posi�on as a silver-focused producer. Americas also owns and operates the Cosalá Opera�ons in Sinaloa, Mexico. Eric Spro� is the Company’s largest shareholder, holding an approximate 20% interest. Americas has a proven and experienced management team led by Paul Huet, is fully funded to execute its growth plans, and focused on becoming one of the top North American silver plays, with an objec�ve of over 80% of its revenue to be generated from silver by the end of 2025.

For More Informa�on:

Maxim Kouxenko - Manager, Investor Rela�ons

M: +1 (647) 888-6458 E: [email protected] W: Americas-gold.com

Technical Informa�on and Qualified Persons

The scien�fic and technical informa�on rela�ng to the Company’s material mining proper�es contained herein has been reviewed and approved by Rick Streiff, Execu�ve Vice President – Geology of the Company. Mr. Streiff is a “qualified person” for the purposes of NI 43-101. The Company’s current Annual Informa�on Form and the NI 43- 101 Technical Reports for its mineral proper�es, all of which are available on SEDAR+ at www.sedarplus.ca, and EDGAR at www.sec.gov, contain further details regarding mineral reserve and mineral resource es�mates, classifica�on and repor�ng parameters, key assump�ons and associated risks for each of the Company’s material mineral proper�es, including a breakdown by category.

All mining terms used herein have the meanings set forth in Na�onal Instrument 43-101 – Standards of Disclosure for Mineral Projects (“NI 43-101”), as required by Canadian securi�es regulatory authori�es. These standards differ from the requirements of the SEC that are applicable to domes�c United States repor�ng companies. Any mineral reserves and mineral resources reported by the Company in accordance with NI 43-101 may not qualify as such under-SEC standards. Accordingly, informa�on contained in this news release may not be comparable to similar informa�on made public by companies subject to the SEC’s repor�ng and disclosure requirements.

Cau�onary Statement on Forward-Looking Informa�on:

This news release contains “forward-looking informa�on” within the meaning of applicable securi�es laws. Forward-looking informa�on includes, but is not limited to, Americas’ expecta�ons, inten�ons, plans, assump�ons, and beliefs with respect to, among other things, the recent results of metallurgical tes�ng at its Galena Complex and the poten�al that a marketable an�mony concentrate may now be possible using modern metallurgical processes, the Company's ability to become a primary an�mony producer in the United States, and the poten�al for commercial recovery and mone�za�on of an�mony and gold, and are subject to the risks and uncertain�es outlined below. O�en, but not always, forward-looking informa�on can be iden�fied by forwardlooking words such as “an�cipate,” “believe,” “expect,” “goal,” “plan,” “intend,” “poten�al,” “es�mate,” “may,” “assume,” and “will” or similar words sugges�ng future outcomes, or other expecta�ons, beliefs, plans, objec�ves, assump�ons, inten�ons, or statements about future events or performance. Forward-looking informa�on is based on the opinions and es�mates of Americas as of the date such informa�on is provided and is subject to known and unknown risks, uncertain�es, and other factors that may cause the actual results, level of ac�vity, performance, or achievements of Americas to be materially different from those expressed or implied by such forward-looking informa�on. These risks and uncertain�es include, but are not limited to: interpreta�ons or reinterpreta�ons of geologic informa�on; unfavorable explora�on results; inability to obtain permits required for future explora�on, development, or produc�on; general economic condi�ons and condi�ons affec�ng the mining industry; the uncertainty of regulatory requirements and approvals; poten�al li�ga�on; fluctua�ng mineral and commodity prices; the ability to obtain necessary future financing on acceptable terms or at all; risks associated with the mining industry generally, such as economic factors (including future commodity prices, currency fluctua�ons, and energy prices), ground condi�ons, failure of plant, equipment, processes, and transporta�on services to operate as an�cipated, environmental risks, government regula�on, actual results of current explora�on and produc�on ac�vi�es, possible varia�ons in grade or recovery rates, permi�ng �melines, capital expenditures, reclama�on ac�vi�es, labor rela�ons; and risks related to changing global economic condi�ons and market vola�lity. Although the Company has a�empted to iden�fy important factors that could cause actual results to differ materially from those contained in forward-looking informa�on, there may be other factors that cause results not to be as an�cipated, es�mated, or intended. Readers are cau�oned not to place undue reliance on such informa�on. Addi�onal informa�on regarding the factors that may cause actual results to differ materially from this forwardlooking informa�on is available in Americas’ filings with the Canadian Securi�es Administrators on SEDAR+ and with the SEC. Americas does not undertake any obliga�on to update publicly or otherwise revise any forwardlooking informa�on whether as a result of new informa�on, future events, or other such factors which affect this informa�on, except as required by law. Americas does not give any assurance (1) that Americas will achieve its expecta�ons, or (2) concerning the result or �ming thereof. All subsequent wri�en and oral forward-looking informa�on concerning Americas are expressly qualified in their en�rety by the cau�onary statements above.