Slide 1: Silver Resource Growth in Mexico
Corporate Presentation | September 2026 Silver Resource Growth in Mexico TSXV: GRSL | OTCQX: GRSLF | FRA: GPE
Slide 2: Cautionary Statements
Cautionary Statements Cautionary Statements This presentation contains “forward-looking statements” within the meaning of Canadian securities laws. Where a forward-looking statement expresses or implies an expectation or belief as to future events or results, such expectation or belief is expressed
Slide 3: Value Generation in a Silver Bull Market
Value Generation in a Silver Bull Market Value Generation in a Silver Bull Market Value Creation 5 Major Catalysts Planned 55Moz Ag (85Moz AgEq) Indicated 20,000m Resource Expansion Drilling Program 22Moz Ag (49Moz AgEq) Inferred (2023 MRE) Existing Infrastructure & Permitting Resource (MRE) Update
Slide 4: Value Creation Road Map
Value Creation Road Map Resource Growth Project Development Value Creation Road Map Resource Growth & Project Development San Marcial Project Secured Funding San Marcial Area Major Catalysts Best Results: 45.1 m H1 2027 CAD$13M / Plomosas Mine: at 1,623 g/t Ag, including Resource Update & 5-year Dri
Slide 5: GRSL Growth Performance
GRSL Growth Performance Delivering Shareholder Results Increased Liquidity GRSL Growth Performance Delivering Shareholder Results & Increased Liquidity 90-Day Average $GRSL 1 Year Chart (% Change YoY) Daily Volume 1.2 Million Capital Structure Shares As at September 10th, 2026 Market Cap (Undiluted
Slide 6: GRSL at an Attractive Valuation
GRSL at an Attractive Valuation Trading at US$1.40/oz vs. US$3.28/oz peer mean (September 4th, 2026), a 57% discount. GRSL at an Attractive Valuation Trading at US$1.40/oz vs. US$3.28/oz peer mean (September 4th, 2026), a 57% discount. TSX.V: GRSL | OTCQX: GRSLF | FRA: GPE 6
Slide 7: District Scale Upside Potential
District Scale Upside Potential Silver Resource Growth Opportunity District Scale Upside Potential Silver Resource Growth Opportunity ➤ Resource Expansion ➤ Infrastructure ➤ Permits San Marcial Resource Area Ongoing Step-Out Drill Campaign Resource Extension N TSX.V: GRSL | OTCQX: GRSLF | FRA: GPE 7
Slide 8: San Marcial Area
San Marcial Area Silver Discovery - Largely Untested Geophysical Anomaly San Marcial Area Silver Discovery - Largely Untested Geophysical Anomaly Plomosas Mine Area A A' San Marcial Area* 46Moz Ag Indicated 14Moz Ag Inferred* TSX.V: GRSL | OTCQX: GRSLF | FRA: GPE 8
Slide 9: San Marcial Area
San Marcial Area Silver Discovery on the Edge of a Potential New Porphyry System San Marcial Area Silver Discovery on the Edge of a Potential New Porphyry System Discovery Section • Blue Sky Potential and Resource Growth • Wide, silver-dominant hydrothermal breccias at shallow depths • ONGOING 20,00
Slide 10: 20,000m Step-Out Drilling Program
20,000m Step-Out Drilling Program Resource Expansion Update 20,000m Step-Out Drilling Program Resource Expansion & Update TSX.V: GRSL | OTCQX: GRSLF | FRA: GPE 10
Slide 11: Best Ever Drill Results at San Marcial
Best Ever Drill Results at San Marcial Location of Step-Out Drill Holes SMS26-04, SMS22-16, SMS22-22 SMS25-11 (May 19th, 2026) Best Ever Drill Results at San Marcial Location of Step-Out Drill Holes SMS26-04, SMS22-16, SMS22-22 & SMS25-11 (May 19th, 2026) Highlight Results of SMS26-04: • 45.1 m true
Slide 12: Best Ever Drill Results at San Marcial
Best Ever Drill Results at San Marcial High-Grade Core from Hole SMS26-04 Best Ever Drill Results at San Marcial High-Grade Core from Hole SMS26-04 TSX.V: GRSL | OTCQX: GRSLF | FRA: GPE 12
Slide 13: Best Ever Drill Results at San Marcial
Best Ever Drill Results at San Marcial Cross-Section A-B, SMS26-04 in relation to SMS22-16, SMS22-22 SMS25-11 Best Ever Drill Results at San Marcial Cross-Section A-B, SMS26-04 in relation to SMS22-16, SMS22-22 & SMS25-11 • Highlight Hole SMS26-04: 45.1 m true width at 1,623 g/t Ag, from 267.85 m do
Slide 14: 5-Year Permitted Step-Out Drilling Program
5-Year Permitted Step-Out Drilling Program 5-Year Permitted Step-Out Drilling Program LONGITUDINAL SECTION SAN MARCIAL RESOURCE AREA DE-RISKING TSX.V: GRSL | OTCQX: GRSLF | FRA: GPE 14
Slide 15: Discovering Ounces Efficiently
Discovering Ounces Efficiently Discovering Ounces Efficiently Wide Silver Mineralized Zones AgEq Ounces Discovered per Metre Drilled 5000 oz/m 4000 oz/m 3000 oz/m 2000 oz/m 1000 oz/m 0 *Market Cap C$188.3M $440M $603M $337M $435M $1.9B Notes: Viz sla Silv er data was taken from Viz sla Silv er Techn
Slide 16: Plomosas Mine Overview
Plomosas Mine Overview Existing Infrastructure with All Major Permits for Development Plomosas Mine Overview Existing Infrastructure with All Major Permits for Development TSX.V: GRSL | OTCQX: GRSLF | FRA: GPE 16
Slide 17: Plomosas Mine: Past-Producer with All Major Permits
Plomosas Mine: Past-Producer with All Major Permits Plomosas Mine: Past-Producer with All Major Permits Bulk Sample Test Mining Program Ongoing Studies Targeting On-Site Pilot Plant • Engineering and metallurgical studies advancing. • Several pilot plant options have been identified and are being as
Slide 18: Plomosas Mine: Past-Producer Employed Efficient Mining
Plomosas Mine: Past-Producer Employed Efficient Mining Bulk Sample Test Mining Program • In addition to information to be gathered via the BSTM, GR Silver Mining benefits from extensive data gleaned from past production. • Grupo Mexico subsidiary IMMSA mined over 2.5Mt of ore from 1986 to 2000 and p
Slide 19: Team Track Record
Team Track Record Team Track Record Discovery, Project Development and Global Mining M&A Marcio Fonseca Board of Directors In Remembrance of our Founder Larry Taddei Lead Independent Director Eric Zaunscherb President & CEO Brent McFarlane Director Robert Payment Chief Financial Officer Eric Zaunsch
Slide 20: Capitalization & Ownership
Capitalization Ownership Capitalization & Ownership Share Ownership 23% Institutional & High Net Worth Cash Position1 Market Cap2 Avg Daily Volume3 3% Management & C$26M C$188.3M 1.2M shares Insiders 74% Retail $GRSL 1 Year Chart (% Change YoY) 90-Day Average September 2025 – September 2026 Daily Vo
Slide 21: Investment Highlights
Investment Highlights Investment Highlights Expanding Resources. Delivering Value. 20,000m Step- 55Moz Ag Ind. Strong Out Drilling 22Moz Ag Inf. Daily Liquidity: Expanding wide high- and Growing 1.2M Shares Low-Cost grade silver targets With Planned H1 90-Day AVG per Silver 2027 MRE Update Portfolio
Slide 22: Appendix Plomosas Project NI 43-101 Resource Statement
Appendix Plomosas Project NI 43-101 Resource Statement Numbers are rounded * AgEq = calculated from the metal prices and recoveries using the equation AgEq = ((Ag grade x Ag Price x Ag recovery) + (Au grade x Au price x Au recovery) + (Pb grade x Pb price x Pb recovery) + (Zn grade x Zn price x Zn r
Slide 23: Appendix Plomosas Mine Historical Production (1986 – 2000)
Appendix Plomosas Mine Historical Production (1986 – 2000) As published in National Instrument (NI) 43-101 2023 Technical Report and Mineral Resource Update for the Plomosas Project, Gilles Arseneau, P.Geo., May 3, 2023 TSX.V: GRSL | OTCQX: GRSLF | FRA: GPE 23
Slide 24: CONTACT US
CONTACT US CONTACT US Investor Relations: Phone +1 236 270 2057 info@grsilvermining.com 409 Granville Street, 15th Floor Vancouver, BC, V6C 1T2 GR Silver Mining @GRSilverMining EXPLORE OUR PROJECTS ON TSXV: GRSL | OTCQX: GRSLF | FRA: GPE TSX.V: GRSL | OTCQX: GRSLF | DEU: GPE 18