MAY 2021 INVESTOR FACT SHEET Investor Inquiries 800.HECLA91 (800.432.5291) hmc-info@hecla-.com

HECLA-MINING.COM Hecla Mining Company is the largest U.S. silver producer and the third largest U.S. producer of both zinc and lead. Hecla owns and operates mines on district-sized land packages in mining-friendly North American jurisdictions: Greens Creek in Alaska, one of the largest and highest-margin primary silver mines in the world; the Lucky Friday silver mine in North Idaho; and the Casa Berardi mine in Quebec. In addition to its diversified silver and gold operating and cash- flow generating base, Hecla has a number of exploration properties and pre-development projects in world-class silver and districts throughout North America.

2020 silver production was 13.5 million ounces and 208,962 ounces of gold production. 2021 estimated production is 12.9-14.0 million ounces of silver and 185,000-193,000 ounces of gold.

The company is positioned to weather COVID-19 with strong assets, an established action plan, senior notes due in 2028, and solid liquidity.

Multiple Secure Revenue Streams Share Performance NYSE: HL Strong Cash Flow Flexibility Low Political Risk Jurisdictions end of Q1: 03/31/21, (1) as of 05/10/21 (1) Share Price: $7.16 Strong (1) 52-Week Range: $2.47 – $8.45 Healthy Cash Margins Investment Established Work Force Basic Shares: 535.3 million Fundamentals Fully Diluted: 545.5 million Market Capitalization: $3.8B (1) Strong Financial Position Commitment to Safety

High-Quality Operations

OPERATING MINES

Greens Creek – Admiralty Island, Alaska ■■ One of the world’s largest and lowest-cost primary silver mines. Greens Creek (Ag, Au, Pb, Zn) ■■ Produced approx. 25M oz. of silver and 1.6M oz. of gold since startup in 1989. ■■ 2.6 M oz. of silver production and 13,266 oz. of gold production in Q1/2021. Kinskuch (Ag) ■■ 2021E production of 9.5-10.2 M oz. of silver and 40-43 K oz. of gold. (Ag, Pb, Zn) Opinaca / Wildcat (Au) Casa Berardi – Val d’Or, Quebec Republic (Au) Rock Creek (Ag, Cu) ■■ 36,190 oz. of gold production in Q1/2021. Casa Berardi (Au) ■■ 2021E production of 125-128 K oz. of gold. Vancouver, BC Montanore (Ag, Cu) Val d’Or, Québec ■■ High-grade intersections discovered at East Mine; discovery of the 160 Zone eastern Coeur d’Alene, Idaho extension in Q4/20. Lucky Friday (Ag, Pb, Zn) Heva-Hosco (Au) ■■ Business improvement activities in 2021 are expected to reduce costs and increase cash flow over the next two years. Midas (Au) Hollister (Au)

Lucky Friday – Mullan, Idaho ■■ Mine reached full production in Q4/2020. Aurora (Au) Fire Creek (Au) ■■ 863,901 oz. of silver production in Q1/2021. San Juan Silver (Ag, Pb, Zn) ■■ 2021E production of 3.4-3.8 M oz. of silver. Monte Cristo (Au) ■■ Continue to test and optimize the new mining method to improve safety and increase productivity which could allow an increase in production beyond the 5 million oz. expected in 2023 due to grade. ■■ Remote Vein Miner delivery expected after completion of reliability testing in Sweden.

Nevada Operations – Elko, Nevada ■■ 2,548 oz. gold production in Q1/2021. ■■ San Sebastian (Ag, Au) 2021E production of 20-22 K oz. of gold. operating mine / mill ■■ Fire Creek and Midas mill expected to be placed on care and maintenance by the pre-development project end of Q2/2021. exploration project ■■ Activities in the second half of 2021 expected to be limited to development at Hollister for Hatter Graben and exploration at Midas. corporate office KEY GROWTH INITIATIVES Company Info

Nevada Operations – The project is being San Sebastian – San Sebastian is a past Rock Creek and Montanore – Rock Creek Investor Relations 800.HECLA91 (800.432.5291) studied to determine how to mine it profitably producing silver and gold mine in Mexico. (acquired in 2015) and Montanore (acquired [email protected] with a lower mining cost. Review includes The Company continues to explore this highly in September 2016) are two large silver/ hydrology studies. The bulk test refractory prospective land package and will evaluate copper deposits in Montana. Rock Creek Public Relations ore processing is not yet complete. Activities further mining based on exploration success. Record of Decision (ROD) for the evaluation Jeanne DuPont, sr. communications coordinator in the second half of 2021 are expected to be 2021 exploration will build on the developing phase remanded by court on ESA procedural T: 208.769.4177

at Hollister where development of the decline resources of the El Bronco, El Tigre, and El issue in April 2021. Focus will now be on the Coeur d’Alene corporate office (HQ) has commenced to allow drilling at Hatter Toro veins. Montanore Project. U.S. Fish and Wildlife 6500 N. Mineral Dr., Suite 200 Graben and exploration at Midas. Service to revise Biological Opinion and Coeur d’Alene, ID 83815-9408 expected completion is early 2022. Evaluation T: 208.769.4100 drilling at Montanore can also assist with Vancouver corporate office Rock Creek planning. Suite 970, 800 W. Pender St. Vancouver, BC, Canada V6C 2V6 T: 604.682.6201

Board of Directors FINANCIAL HIGHLIGHTS Ted Crumley, chairman Phillips S. Baker, Jr. (dollars in thousands, except per share amounts) Catherine ‘Cassie’ J. Boggs Q1/2021 2020 2019 2018 2017 George R. Johnson Sales of products $ 210,852 $ 691,873 $ 673,266 $ 567,137 $ 577,775 George R. Nethercutt, Jr. Net income (loss) 18,971 (16,790) (99,557) (26,563) (28,520) Stephen F. Ralbovsky Cash provided by operating activities 37,936 180,793 120,866 94,221 115,878 Terry V. Rogers Charles B. Stanley Cash, cash equivalents and short-term investments at end of reporting period 139,750 129,830 62,452 27,389 219,865 Alice Wong Dividend per Common Share 0.00875 0.01125 0.01 0.01 0.01 Management Leading Silver Producer with Strong Cash Margins (Greens Creek, Lucky Friday and San Sebastian) Phillips S. Baker, Jr., president and CEO Clayr Alexander Carlos Aguiar Kurt Allen Keith Blair Robert Brown Mike Clary Ronald Durham Brian Erickson Russell Lawlar Eric Hill Lauren Roberts Luke Russell David C. Sienko

(1) Cash cost, after by-product credits, per silver ounce represents non-U.S. Generally Accepted Accounting Principles (GAAP) measurement; a reconciliation of which to cost of sales and other direct production costs and depreciation, depletion and amortization (GAAP) can be found below. (2) Realized prices are calculated by dividing gross revenues for each metal by the payable quantities of each metal included in the concentrate and doré sold during the period. Reconciliation of Cost of Sales and Other Direct Production Costs and Depreciation, Depletion and Amortization, the most comparable GAAP measurement, to Cash Cost, After By-Product Credits, per Silver Ounce for Greens Creek, Lucky Friday & San Sebastian Analyst Coverage (dollars and ounces in thousands, except per ounce) Q1/2020 Q2/2020 Q3/200 Q4/200 Q1/2021 Michael Jalonen, BofA Merrill Lynch Costs of sales and other direct production costs and depreciation, depletion and amortization (GAAP) $ 60,314 $ 74,137 $ 78,517 $ 60,314 $ 76,069 Matthew Fields, BofA Merrill Lynch (High Yield) Depreciation, depletion and amortization (14,204) (15,777) (15,472) (14,204) (21,157) Ryan Thompson, BMO Capital Markets Treatment costs 16,362 23,095 26,794 16,362 15,519 Lucas Pipes, B Riley Securities Change in product inventory 4,037 (4,536) 3,735 4,037 308 Dalton Baretto, Canaccord Genuity Corp. (Canada) Reclamation and other costs (42) (203) (1,283) (42) (588) Exclusion of Lucky Friday Costs (3,876) (12,475) (22,593) (3,876) - Mike Kozak, Cantor Fitzgerald Cash cost, before by-product credits (1) 62,591 63,241 69,699 62,591 70,151 Cosmos Chiu, CIBC World Markets By-product credits (44,578) (48,760) (56,833) (44,578) (65,311) Heiko Ihle, H.C. Wainwright & Co. Cash cost, after by-product credits $ 18,013 $ 14,481 $ 33,459 $ 18,013 $ 4,840 Michael Siperco, RBC Capital Markets Divided by silver ounces produced 3,123 2,912 2,901 3,123 3,449 Matthew Farwell, Roth Capital Partners Cash cost, before by-product credits, per silver ounce $ 20.03 $ 21.71 $ 24.02 $ 20.04 $ 20.34 Trevor Turnbull, Scotia Capital, Inc. By-product credits per silver ounce $ (14.27) $ (16.74) $ (19.59) $ (14.27)) $ (18.04) Cash cost, after by-product credits, per silver ounce $ 5.76 $ 4.07 $ 4.43 $ 5.77 $ .1.40

(1) Includes all direct and indirect operating cash costs related to the physical activities of producing metals, including mining, processing and other plant costs, third-party refining and marketing expense, on-site general and administrative costs, royalties and mining production taxes, net of by-product revenues earned from all metals other than the primary metal produced at each unit. Largest Institutional Owners

Qualified Person (QP) Pursuant to Canadian National Instrument 43-101 (research as of 03/31/21) Kurt D. Allen, MSc., CPG, Director - Exploration of Hecla Limited and Keith Blair, MSc., CPG, Chief Geologist of Hecla Limited, who serve as a Qualified Person under National Instrument 43-101, supervised the preparation of the scientific and technical information concerning Hecla’s mineral projects in this fact sheet, including with respect to the newly acquired Nevada projects. Information regarding data verification, surveys and investigations, quality Van Eck Associates Corporation assurance program and quality control measures and a summary of sample, analytical or testing procedures for the Greens Creek Mine are contained in a technical report prepared for Hecla titled “Technical Report for the Greens Creek Mine, Juneau, Alaska, USA” effective date December 31, 2018, and for the Lucky Friday Mine are contained in a technical report prepared for Hecla titled “Technical Report on the Lucky Friday Mine Shoshone County, The Vanguard Group, Inc. Idaho, USA” effective date April 2, 2014, for the Casa Berardi Mine are contained in a technical report prepared for Hecla titled “Technical Report on the Mineral Resource and Mineral Reserve Estimate for the Casa Berardi Mine, Northwestern Quebec, Canada” effective date December 31, 2014 (the “Casa BerardiTechnical Report”), and for the San Sebastian Mine are contained in a technical report prepared for Hecla titled “Technical Report for the San BlackRock Institutional Trust Company, N.A. Sebastian Ag-Au Property, Durango, Mexico” effective date September 8, 2015. Also included in these four technical reports is a description of the key assumptions, parameters and methods used to estimate mineral reserves Dimensional Fund Advisors, LP and resources and a general discussion of the extent to which the estimates may be affected by any known environmental, permitting, legal, title, taxation, socio-political, marketing or other relevant factors. Information regarding data verification, surveys and investigations, quality assurance program and quality control measures and a summary of sample, analytical or testing procedures for the Fire Creek Mine are contained in a technical report prepared State Street Global Advisors (US) for Klondex Mines, dated March 31, 2018; the Hollister Mine dated May 31, 2017, amended August 9, 2017; and the Midas Mine dated August 31, 2014, amended April 2, 2015. Copies of these technical reports are available under Hecla’s and Klondex’s profiles on SEDAR at www.sedar.com. Mr. Allen and Mr. Blair reviewed and verified information regarding drill sampling, data verification of all digitally-collected data, drill surveys and specific gravity ETF Managers Group, LLC determinations relating to the Casa Berardi mine. The review encompassed quality assurance programs and quality control measures including analytical or testing practice, chain-of-custody procedures, sample storage procedures and included independent sample collection and analysis. This review found the information and procedures meet industry standards and are adequate for Mineral Resource and Mineral Reserve estimation and mine planning Mirae Asset Global Investments (USA) LLC purposes. Geode Capital Management, LLC Cautionary Statements Northern Trust Investments, Inc. Statements made or information provided that are not historical facts are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 and “forward-looking information” within the meaning of Canadian securities laws. Words such as “may”, “will”, “should”, “expects”, “intends”, “projects”, “believes”, “estimates”, “targets”, “anticipates” and similar expressions are used to identify these forward-looking statements. The Jupiter Fund Managment LLC material factors or assumptions used to develop such forward-looking statements or forward-looking information include that the Company’s plans for development and production will proceed as expected and will not require revision as a result of risks or uncertainties, whether known, unknown or unanticipated, to which the Company’s operations are subject. Forward-looking statements involve a number of risks and uncertainties that could cause actual results to differ materially from those projected, anticipated, expected or implied.These risks and uncertainties include, but are not limited to, metals price volatility, volatility of metals production and costs, litigation, regulatory and environmental risks, operating risks, project development risks, political risks, labor issues, ability to raise financing and exploration risks and results. Refer to the Company’s Form 10K and 10-Q reports for a more detailed discussion of risk factors that may impact expected future results. The Company undertakes no obligation and has no intention of updating forward-looking statements other than as may be required by law.