Rock CreekNoxon, Montana

Monte CristoEsmeralda County, Nevada

FayolleVal d’Or, Quebec

San Juan SilverCreede, Colorado

San SebastianDurango, Mexico

Opinaca / WildcatJames Bay, Quebec

Heva–HoscoVal d’Or, QuebecSilver Valley

Wallace, Idaho

Greens CreekAdmiralty Island, Alaska

Coeur d’Alene, Idaho

Lucky FridayMullan, Idaho

Casa BerardiVal d’Or, Quebec

Val d’Or, QuebecMontanoreLibby, Montana

KinskuchAlice Arm, BC

Vancouver, BC

operating mine

pre-development project

exploration project

corporate office

Hecla Mining Company is not only the largest and one of the lowest-cost U.S. silver producers, and the third largest U.S. producer of both zinc and lead, but also a growing gold producer.

Hecla owns and operates four 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 newly revitalized Lucky Friday silver mine in North Idaho; the San Sebastian silver-gold mine near Durango, Mexico; and the Casa Berardi gold 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 seven world-class silver and gold mining districts in the U.S., Canada, and Mexico.

2016 saw record silver production of 17.2 million ounces with 233,929 ounces of gold production, with silver production exceeding the Company’s expectations for 2016. The Company is suspending Lucky Friday and Company-wide 2017 silver production estimates, because it is unable to predict when the ongoing strike at the Lucky Friday mine will be resolved.

Greens Creek – Admiralty Island, Alaska ■ One of the world’s largest and lowest-cost primary

silver mines. ■ Produced approx. 210M oz. of silver and

1.5M oz. of gold since startup in 1989. ■ 1.9M oz. of silver production and 14,022 oz. of

gold production in Q1/17; 2017E silver production of 7.4-8.0M oz. and 54-60k oz. of gold.

Lucky Friday – Mullan, Idaho ■ 0.681M oz. of silver production in Q1/17; 2017E

silver production TBD. ■ Workers on strike since March 13, 2017. ■ #4 Shaft is now operational.

Casa Berardi – Val d’Or, Quebec ■ 35,807 oz. of gold production in Q1/17; 2017E

gold production of 150-165k oz. ■ East Mine Crown Pillar (EMCP) pit mining is

underway with additional surface pits expected to be mined throughout the remainder of the mine life.

San Sebastian – Durango, Mexico ■ 0.751M oz. of silver production and 6,284 oz. of

gold production in Q1/17; 2017E silver production of 3.0-3.4M oz. and 21-25k oz. of gold.

■ Strong exploration potential; plan is to transition from open pit to underground mining by end of 2017.

San Sebastian – Hecla’s Newest Mine – San Sebastian is a very high-grade silver and gold mine in Mexico. A series of shallow open pits are being mined over an expected 24 months, generating strong cash flow for the Company. The Company has the mill leased for 2018 and expects to transition from open pit to underground mining by the end of 2017. A ramp is under construction to connect the new portal to the existing workings, which are being rehabilitated.

May 2017 Investor Fact Sheet www.hecla-mining.com

Multiple Secure Revenue Streams

Low Political Risk Jurisdictions

Established Work Force

Commitment to Safety

Four High-Quality Operations

Strong Cash Flow Flexibility

Healthy Cash Margins

Strong Financial Position

Strong Investment

Fundamentals

Share Performance NYSE: HLend of Q1: 03/31/17, (1) as of 04/27/17 Share Price: $ 5.33(1)

52-Week Range: $ 3.83 – $7.64(1)

Basic Shares: 395.8 millionFully Diluted: 399.8 millionMarket Capitalization: $ 2.11B (1)

Operating Mines

Key Growth Initiatives

Rock Creek and Montanore – Rock Creek (acquired in 2015) and Montanore (acquired in September 2016) are two large silver/copper deposits in Montana. Rock Creek expects a Final EIS in the second quarter of 2017. The Record of Decision is anticipated later this year or early in 2018. Montanore has an EIS and Record of Decision. The projects are being permitted separately and both have the potential to be large, long-lived silver/copper mines.

Lucky Friday #4 Shaft – The #4 Shaft, a key growth project, is now operational. Reaching 9,600 feet below the surface, the #4 Shaft is an important part of Lucky Friday’s future as it provides access to the highest-grade ore in the mine’s 75-year history and should extend the mine life for 20-30 more years. In 2017, the focus is on developing the 6500 level to connect the #4 Shaft to the orebody.

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(1) (dollars and ounces in thousands, except per ounce)

Q1/2016 Q2/2016 Q3/2016 Q4/2016 Q1/2017 Costs of sales and other direct production costs and depreciation, depletion and amortization (GAAP) $ 71,036 $ 71,667 $ 84,413 $ 71,623 $ 65,162Depreciation, depletion and amortization 17,374 (16,300) (16,181) (18,301) (16,438) Treatment costs (20,963) 20,527 20,673 21,950 18,173 Change in product inventory (1,959) 2,122 (9,523) (4,013) (2,736) Reclamation and other costs 605 (1,369) (1,571) (1,439) (1,158) Cash cost, before by-product credits (2) 75,979 76,647 77,811 77,846 68,475 By-products credits (61,330) (60,577) (61,942) (71,322) (65,626) Cash cost, after by-product credits $ 14,649 $ 16,070 $ 15,869 $ 6,524 $ 2,849Divided by silver ounces produced 4,635 4,233 4,309 3,967 3,361 Cash cost, before by-product credits, per silver ounce $ 16.39 $ 18.11 $ 18.06 $ 16.62 $ 20.37 By-product credits per silver ounce $ (13.23) $ (14.31) $ (14.38) $ (17.98) $ (19.53) Cash cost, after by-product credits, per silver ounce $ 3.16 $ 3.80 $ 3.68 $ 1.64 $ 0.84 (1) Commercial production began at the San Sebastian unit in the fourth quarter of 2015.(2) 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.

Financial Highlights(dollars in thousands, except per share amounts) Q1/2017 2016 2015 2014 2013 Sales of products $ 142,544 $ 645,957 $ 443,567 $ 500,781 $ 382,589 Net income (loss) 26,834 69,547 (86,968) 17,824 (25,130) Cash provided by operating activities 38,285 225,328 106,445 83,124 26,644Cash, cash equivalents and short-term investments at end of reporting period 213,291 198,894 155,209 209,665 212,175Dividend per Common Share 0.0025 0.01 0.01 0.01 0.02

(research as of 03/31/17)Dimensional Fund Advisors, LP The Vanguard Group, Inc. Van Eck Associates Corporation BlackRock Institutional Trust Company, N.A. J O Hambro Capital Management LimitedState Street Global Advisors (US)New Jersey Division of InvestmentCeredex Value Advisors LLCNorthern Trust Investments, Inc.Goldman Sachs Asset Management (US)

(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.

Leading Silver Producer with Strong Cash Margins (Greens Creek, Lucky Friday and San Sebastian)

Qualified Person (QP) Pursuant to Canadian National Instrument 43-101 Dean McDonald, P.Geo., Senior Vice President – Exploration of Hecla Mining Company, who serves as a Qualified Person under National Instrument 43-101(“NI 43-101”), supervised the preparation of the scientific and technical information concerning Hecla’s mineral projects in this fact sheet. Information regarding data verification, surveys and investigations, quality assurance program and quality control measures and a summary of 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” effective date March 28, 2013, and for the Lucky Friday Mine are contained in a technical report prepared for Hecla and Aurizon titled “Technical Report for the Lucky Friday Mine Shoshone County, Idaho, USA” effective date April 2, 2014, and for the Casa Berardi Mine are contained in a technical report prepared for Aurizon titled “Technical Report on the mineral resource and mineral reserve estimate for Casa Berardi Mine, Northwestern Quebec, Canada” effective date March 31, 2014 (the “Casa Berardi Technical Report”), and for the San Sebastian Mine are contained in a technical report titled “Technical Report for the San 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 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. Copies of these technical reports are available under Hecla’s and Aurizon’s profiles on SEDAR at www.sedar.com. The Casa Berardi Technical Report was reviewed by Dr. McDonald on behalf of Hecla. To the best of Hecla’s knowledge, information and belief, there is no new material scientific or technical information that would make the disclosure of the mineral resources and mineral reserves for Casa Berardi in this fact sheet inaccurate or misleading.

Cautionary Statements Statements made which are not historical facts, such as strategies, plans, production, exploration results and plans, costs, and prices or sales performance are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995 and “forward looking information” under 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. 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, environmental and litigation risks, operating risks, project development risks, political risks, labor issues, ability to raise financing, and exploration risks. Refer to our Form 10-K and 10-Q reports for a more detailed discussion of risk factors that may impact expected future results. We undertake no obligation to update forward-looking statements other than as may be required by law.

DirectorsTed Crumley, ChairmanPhillips S. Baker, Jr.Catherine ‘Cassie’ J. BoggsGeorge R. JohnsonGeorge R. Nethercutt, Jr.Stephen F. RalbovskyTerry V. RogersCharles B. StanleyDr. Anthony P. Taylor

OfficersPhillips S. Baker, Jr., President & CEOLindsay Hall, Sr. VP – Chief Financial OfficerLarry Radford, Sr. VP – OperationsDean W. McDonald, Sr. VP – ExplorationDavid C. Sienko, VP – General CounselRob Brown, VP – Corporate Development

U.S. Corporate Office 6500 North Mineral Drive, Suite 200Coeur d’Alene, Idaho 83815-9408208.769.4100

Canadian Corporate Office Suite 970, 800 West Pender StreetVancouver, BC, Canada V6C 2V6604.682.6201

Investor Inquiries 800.432.5291 | hmc-info@hecla-mining.com

Largest Institutional Owners Company Info

Analyst Coverage

Michael Jalonen, BofA Merrill LynchMatthew Fields, BofA Merrill Lynch (High Yield) Andrew Kaip, BMO Capital MarketsCosmos Chiu, CIBC World MarketsChris Terry, Deutsche BankLucas Pipes, FBR & Co.John Bridges, JP MorganMark Mihaljevic, RBC Capital MarketsHeiko Ihle, Rodman & RenshawTrevor Turnbull, Scotia Capital, Inc.Michael Dudas, Vertical Research PartnersDavid Deterding, Wells Fargo Securities (High Yield)