Aya Gold & Silver

htm EX-99 Document PRESS RELEASE Aya Gold Silver Announces Updated PEA for Boumadine After-Tax NPV Doubles to $3.5B with 93% IRR Stronger economics, longer mine life and higher silver production underpin low capex precious metals project Montreal, Quebec, September 9, 2026 - Aya Gold Silver Inc.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

Strong capital efficiency 3 $463M of initial capital expenditure - broadly in line with the 2025 PEA, with NPV 5% Capex ratio increasing to 7.6x, up from 3.3x in the Prior PEA.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

Table 1 Boumadine 2026 PEA - Project Economic Highlights After-tax Updated PEA 2025 PEA Change Base case assumptions (LOM 4 ) Gold Price $ oz 3,500 2,800 25 % Silver Price $ oz 50 30 67 % Average metal payables % 83 % 73 % 10 pts Project Economics (LOM 4 ) Net Present Value (NPV 5% ) $M 3,537 1,475 140 % Internal Rate of Return ( IRR ) % 93 % 47 % 46 pts Payback years 0.7 2.1 -1.4 Initial Capital Expenditures $M 463 446 4 % Capital Efficiency Ratio 3 - 7.6 3.3 4.3 Revenue $M 10,995 6,991 57 % EBITDA 5 $M 6,145 3,418 80 % Free Cash Flow (FCF) 5 $M 4,694 1,958 140 % 3.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

Capital efficiency ratio is the ratio of Net Present Values, discounted at 5%, to the initial capital expenditure.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

We intend to fund Boumadine through existing cash flow and external debt, consistent with our long-term strategy to minimize dilution and deliver superior returns for all shareholders.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

Capital Expenditures The project capital cost estimate was compiled by Lycopodium, with input from CCE for mining, Epoch for the TSF and local firms for water supply, logistics and power.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

We intend to fund Boumadine through existing cash flow and external debt, consistent with our long-term strategy to minimize dilution and deliver superior returns for all shareholders.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

The overall strategy is to achieve an average production rate to maintain a processing throughput of 8,000 tonnes per day ( tpd ) over the LOM.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

The updated mine plan prioritizes higher feed grades to the mill during the initial years of production.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

A 400,000-metre drilling program (2026 - 2027) is underway, with 90% focused on infilling the known trends and the remainder directed toward extending the known mineralization and exploration.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

With 360,000 m focused on Mineral Resource definition, with the objective of converting inferred Mineral Resources into indicated Mineral Resources required for the feasibility study and 40,000 m for step out drilling and exploration.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

All statements, other than statements of historical fact included in this press release, regarding the Company s strategy, future operations, technical assessments, prospects, plans and objectives of management are forward-looking statements that involve risks and uncertainties.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

Forward-looking statements are also subject to risks and uncertainties facing the Company s business, any of which could have a material adverse effect on the Company s business, financial condition, results of operations and growth prospects.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

In addition, readers are directed to carefully review the detailed risk discussion in the Company s Annual Information Form and Management s Discussion Analysis for the year ended December 31, 2025, filed on SEDAR+ and on EDGAR, which discussions are incorporated by reference in this press release, for a fuller understanding of the risks and uncertainties that affect the Company s business and operations.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

If any of these risks or uncertainties materialize, actual results may vary materially from those anticipated in the forward-looking statements found herein.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

Due to the risks, uncertainties, and assumptions inherent in forward-looking statements, readers should not place undue reliance on forward-looking statements.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026

The decision to proceed with development in the absence of such a feasibility study involves materially greater technical and economic risks, including increased uncertainty as to mineral recovery, capital and operating costs, production rates, mine design and overall economic viability.

SEC original ↗Aya Gold & Silver — Earnings release (6-K exhibit)EX-99Sep 9, 2026