Hecla Mining Company · NYSE:HL

Hecla Mining — Investor Presentation (April 2024)

77 slides from Hecla Mining's investor presentation, April 2024

1. Slide 1: April 2024 Update

   Largest U.S. silver producer, soon-to-be largest Canadian silver producer APRIL 2024 UPDATE RESPONSIBLE. SAFE. INNOVATIVE.

2. Slide 2: Cautionary Statements

   HECLA MINING COMPANY NYSE: HL CAUTIONARY STATEMENTS APRIL 2024 UPDATE Cautionary Statement Regarding Forward-Looking Statements resources.” Mineral resources that are not mineral reserves do not have demonstrated economic viability. You should not assume that all or any part of measured or indicated

3. Slide 3: What Makes Hecla the Premier Silver Investment

   HECLA MINING COMPANY NYSE: HL WHAT MAKES HECLA THE PREMIER SILVER INVESTMENT APRIL 2024 UPDATE Best In Class Silver Portfolio  Leading Silver Producer in the World’s Best Mining Jurisdictions  Largest U.S silver producer (45%)*, Canada’s by 2024, 3rd largest primary silver producer globally  Safe

4. Slide 4: Safe and Sustainable Mining

   HECLA MINING COMPANY NYSE: HL SAFE AND SUSTAINABLE MINING APRIL 2024 UPDATE All-Injury Frequency Rate of 1.45 (*)  16% lower than the U.S. average  Reduced by 76% since 2012 ~40,500 hours of safety and health training  Greens Creek (0.29) and Lucky Friday (0.66) AIFR for employees and contractors

5. Slide 5: Largest Silver Producer in the U.S. & Soon, Canada

   HECLA MINING COMPANY NYSE: HL LARGEST SILVER PRODUCER IN THE U.S. & SOON, CANADA APRIL 2024 UPDATE World Production of Silver 2022 U.S. Silver Production (Moz) 24% Mexico Three countries Peru 14.2 Hecla is the largest silver produce ~51% of 45% China producer in the U.S. and is the world’s silver 13

6. Slide 6: Largest U.S./Canada Reserve Base with Highest Grades

   HECLA MINING COMPANY NYSE: HL LARGEST U.S./CANADA RESERVE BASE WITH HIGHEST GRADES APRIL 2024 UPDATE Silver Reserves and Reserve Grade* Silver Reserves (Moz) in U.S. and Canada Silver Reserves (Moz) Total Silver Reserves (MM oz)* Silver Grade (g/t) 2nd highest silver reserve grades, with the largest

7. Slide 7: Low-Cost Profile Silver Assets

   HECLA MINING COMPANY NYSE: HL LOW-COST PROFILE SILVER ASSETS APRIL 2024 UPDATE Silver AISC Curve of Hecla and Silver Peers*– 12 Months Ended December 31, 2023 US$/oz AISC Hecla Silver Peers* 20.2 20.4 22.9 18.2 19.6 15.2 12.6 11.8 - 20,000 40,000 60,000 80,000 100,000 120,000 Silver Production (Kt)

8. Slide 8: Leading Dividend Policy with Silver Linked Dividend

   HECLA MINING COMPANY NYSE: HL LEADING DIVIDEND POLICY WITH SILVER LINKED DIVIDEND APRIL 2024 UPDATE Industry’s only silver-linked dividend policy pays an annual base dividend (1.5 cents per share) plus a silver price- linked dividend that starts at $20/oz silver price. Silver Linked Dividends $8.0 D

9. Slide 9: Our Operations

   OUR OPERATIONS Silver mines are in the best third of cost curve RESPONSIBLE. SAFE. INNOVATIVE. 9

10. Slide 10: Greens Creek: Flagship Mine

    HECLA MINING COMPANY NYSE: HL GREENS CREEK: FLAGSHIP MINE GREENS CREEK APRIL 2024 UPDATE Location: Admiralty Island, Alaska Type: Underground Metals: Silver, Gold, Lead, Zinc Silver Reserves: 105Moz at 10.5 opt Mine Plan: 14 Years Energy Use: 88% of electricity is line power, of which 100% is renewa

11. Slide 11: World's 11th Largest Silver Mine

    HECLA MINING COMPANY NYSE: HL WORLD’S 11th LARGEST SILVER MINE GREENS APRILCREEK 2024 UPDATE Since 1987, Greens Creek has: Mined more than -  20.9 million tons, containing 354.7Moz Silver, 2.9Moz, Gold, 4.1Blbs Zinc, 1.6Blbs Lead Generated more than -  $3.0 billion in cash flow from operations  $

12. Slide 12: Continuous Improvement Since Acquisition

    HECLA MINING COMPANY NYSE: HL CONTINUOUS IMPROVEMENT SINCE ACQUISITION GREENS APRILCREEK 2024 UPDATE Mill Throughput, 2008 – 2023 Silver Mill Recoveries, 2008 - 2023 Tons per Day % 25% increase in 7% Increase in silver throughput since 2008 recoveries since 2008 2,506 2,415 82 80 2,229 2,236 78 2,15

13. Slide 13: Consistency & Innovation Free Cash Flow Engine

    HECLA MINING COMPANY NYSE: HL CONSISTENCY & INNOVATION  FREE CASH FLOW ENGINE GREENS APRILCREEK 2024 UPDATE Cumulative Cash Flow from Operations, Free Cash Flow* ($ Million) Free Cash Flow 3,026 Cash Flow from Operations Low-cost structure, high 2,857 2,716 123% grades, low capital 2,506 requiremen

14. Slide 14: Lucky Friday: Positioned for Growth

    HECLA MINING COMPANY NYSE: HL LUCKY FRIDAY: POSITIONED FOR GROWTH LUCKY FRIDAY APRIL 2024 UPDATE Location: Mullan, Idaho Type: Underground Metals: Silver, Lead, Zinc Silver Reserves: 78Moz at 12.5 opt Mine Plan: 19 Years Energy Use: 60% of electricity is from renewable hydropower, with the remaining

15. Slide 15: Innovation Driven Growth

    HECLA MINING COMPANY NYSE: HL INNOVATION DRIVEN GROWTH LUCKY FRIDAY APRIL 2024 UPDATE 2nd Cornerstone Asset, Mine plan of 19 Years  Poised to be a 5Moz silver producer  H1/2023 - Generated $65M in cash flow from operations and $34M in free cash flow(2)  Expect $50M in insurance payments to be rec

16. Slide 16: Strong Labor Relations

    HECLA MINING COMPANY NYSE: HL STRONG LABOR RELATIONS LUCKY FRIDAY APRIL 2024 UPDATE Union ratification of labor contract in January 2023 solidifies Lucky Friday’s growth  No material changes; work rules are largely unchanged Key terms  Term of agreement – 6 years and 4 months  Longest contract in

17. Slide 17: Potential for Growth at Depth

    HECLA MINING COMPANY POTENTIAL FOR GROWTH AT DEPTH NYSE: HL APRIL 2024 UPDATE Lucky Friday 30 Vein Long Section Exploration Program A A’ Eastern Definition Program:  10 Drill holes, 14,000 feet AgEq OPT: AgEq OPT: Vein Only Diluted Reserves  Potential for ~10 Moz Silver < 10 < 10 10 - 20 10 - 20 E

18. Slide 18: Underhand Closed Bench Method

    HECLA MINING COMPANY NYSE: HL UNDERHAND CLOSED BENCH METHOD LUCKY FRIDAY APRIL 2024 UPDATE UCB mining method: large-scale blasting proactively manages seismic risk and increases throughput Is safer: miners Uses advanced drilling work below and blasting techniques engineered to fragment the backfill

19. Slide 19: Best Decade in 80 Year History Is Ahead

    HECLA MINING COMPANY NYSE: HL BEST DECADE IN 80 YEAR HISTORY IS AHEAD LUCKY FRIDAY APRIL 2024 UPDATE Silver Production by Decade* (Million oz) UCB method’s success and higher grades mined at depth ~2x 50 position Lucky Friday to be a 5Moz producer for 10+ years 30 28 28 27 26 18 1962-1971 1972-1981

20. Slide 20: Keno Hill: Production Growth in Yukon

    HECLA MINING COMPANY NYSE: HL KENO HILL: PRODUCTION GROWTH IN YUKON KENO HILL APRIL 2024 UPDATE Location: Yukon, Canada Type: Underground Metals: Silver, Lead, Zinc Silver Reserves: 55 Moz at 26.6 opt Mine Plan: 11 years Energy Use: 86% of electricity is from renewable hydropower and wind 2023 Direc

21. Slide 21: Building a Strong Foundation

    HECLA MINING COMPANY NYSE: HL BUILDING A STRONG FOUNDATION KENO HILL APRIL 2024 UPDATE Positioned to be Canada’s largest silver producer  Largest primary silver reserves in Canada  Since acquisition, 45% increase in silver reserves to ~55Moz at 26.6 opt  Land package of 88 square miles, Significa

22. Slide 22: Keno Hill Technical Report Highlights

    HECLA MINING COMPANY NYSE: HL KENO HILL TECHNICAL REPORT HIGHLIGHTS KENO HILL APRIL 2024 UPDATE Technical Report S-K 1300 Highlights Mine life, based on reserve plan years 11 Ore Tons Processed Tons (000) 2,069 Silver Grade Opt 26.6 Silver Recovery % 96.0 Total Silver Produced oz (000) 52,865 Silver

23. Slide 23: Development – Bermingham

    HECLA MINING COMPANY NYSE: HL DEVELOPMENT – BERMINGHAM KENO HILL APRIL 2024 UPDATE Development plan: Looking southeast Production shapes: Looking southeast Initial Etta Zone Initial Production Production Area Arctic Zone Area Arctic Zone Bear Bear Zone Zone Bermingham Deep ~100m 23

24. Slide 24: Development – Flame & Moth

    HECLA MINING COMPANY NYSE: HL DEVELOPMENT – FLAME & MOTH KENO HILL APRIL 2024 UPDATE Development plan: Looking northwest Production shapes: Initial Production Area Christal Zone Lightning Zone ~100m 24

25. Slide 25: Casa Berardi: Gold Exposure in Quebec

    HECLA MINING COMPANY NYSE: HL CASA BERARDI: GOLD EXPOSURE IN QUEBEC CASAAPRIL BERARDI 2024 UPDATE Location: Quebec, Canada Type: Open Pit/Underground Metals: Gold Gold Reserves: 1.3Moz at 0.08 opt Mine Plan: 14 Years Energy Use: 100% of electricity is from renewable hydropower 2023 Direct Local Econ

26. Slide 26: Casa Berardi: Executing on Surface Transition Plan

    HECLA MINING COMPANY NYSE: HL CASA BERARDI: EXECUTING ON SURFACE TRANSITION PLAN CASAAPRIL BERARDI 2024 UPDATE Technical report demonstrates long- term value in pits with a 14-year reserve mine plan  Transition to complete surface operation by mid-2024 is exceeding cost and tonnage expectations  F

27. Slide 27: Open Pit Transition Can Unlock Significant Value

    HECLA MINING COMPANY NYSE: HL OPEN PIT TRANSITION CAN UNLOCK SIGNIFICANT VALUE CASAAPRIL BERARDI 2024 UPDATE Casa Berardi: Conceptually divided in three phases* I. Mining the F160 pit II. Preparation for high-grade pits III. Mining higher-grade pits Aggregate free cash flow Investment phase with pro

28. Slide 28: Casa Berardi Technical Report Highlights

    HECLA MINING COMPANY NYSE: HL CASA BERARDI TECHNICAL REPORT HIGHLIGHTS CASAAPRIL BERARDI 2024 UPDATE Technical Report S-K 1300 Highlights Mine life, based on reserve plan years 14 Ore Milled Tons (M) 15.8 Gold Grade (mined) – Open pit** Opt 0.08 Gold Grade (mined) – Opt 0.14 Underground** Gold Grade

29. Slide 29: Montana Assets: 3rd Largest Undeveloped Copper Deposit in the U.S.

    MONTANA ASSETS: 3rd LARGEST UNDEVELOPED COPPER DEPOSIT IN HECLA MINING COMPANY NYSE: HL THE U.S. APRIL 2024 UPDATE Located 50 miles from Lucky Friday Working to advance underground data with great exploration potential collection and permitting Permitting strategy  Executing strategy to expedite au

30. Slide 30: Financial Review

    FINANCIAL REVIEW RESPONSIBLE. SAFE. INNOVATIVE. 30

31. Slide 31: 2023 Financial Highlights

    HECLA MINING COMPANY NYSE: HL 2023 FINANCIAL HIGHLIGHTS APRIL 2024 UPDATE 2023 Revenues By Metal Strong Silver Margins Net Debt to Adjusted EBITDA ($/silver ounce) ($ Million) 2nd highest revenues in history Margins are 50% of silver price 2024: Achieve target of < 2x Realized Price Margin (4) Adjus

32. Slide 32: Investing for Production Growth

    HECLA MINING COMPANY NYSE: HL INVESTING FOR PRODUCTION GROWTH APRIL 2024 UPDATE Strong free cash flow generation from Free Cash Flow: Greens Creek, Lucky Friday silver operations invested in production ($ Million) growth  Capital investment drives 15-20% Free Cash Flow (2) growth in 2024, 30% by 20

33. Slide 33: 2023 Revenue, Production, and Cost Highlights

    HECLA MINING COMPANY NYSE: HL 2023 REVENUE, PRODUCTION, AND COST HIGHLIGHTS APRIL 2024 UPDATE Silver Gold Lead Zinc Silver Production: 14.3Moz Total Cost of Sales(7): $379.6M Total 2023 Silver Cash Costs, after by-product credits(5): $3.23/oz 15% Margins(3): $11.57/oz AISC, after by-product credits(

34. Slide 34: Guidance

    GUIDANCE RESPONSIBLE. SAFE. INNOVATIVE.

35. Slide 35: Guidance – Strong Silver Production Growth

    HECLA MINING COMPANY NYSE: HL GUIDANCE – STRONG SILVER PRODUCTION GROWTH APRIL 2024 UPDATE 15-20% Silver production growth in 2024, 30% by 2026 Silver Production Gold Production (Koz) Silver Equivalent (Moz) Gold Equivalent (Koz) (Moz) Consolidated Production 2024 Total 16.5 - 17.5 121.0 – 133.0 40.

36. Slide 36: Guidance – 2024 Production and Costs by Operation

    HECLA MINING COMPANY NYSE: HL GUIDANCE – 2024 PRODUCTION AND COSTS BY OPERATION APRIL 2024 UPDATE Silver Production (Moz) Gold Production (Koz) Silver Equivalent (Moz)6 Gold Equivalent (Koz)6 2024 Production Greens Creek * 8.8 – 9.2 46.0 - 51.0 21.0 – 21.5 235 – 245 Lucky Friday * 5.0 – 5.3 N/A 9.5

37. Slide 37: Silver Market

    SILVER MARKET RESPONSIBLE. SAFE. INNOVATIVE. 37

38. Slide 38: The World's Growing Needs for Silver

    HECLA MINING COMPANY NYSE: HL THE WORLD’S GROWING NEEDS FOR SILVER APRIL 2024 UPDATE Five distinct periods of silver demand, three that Despite decrease in photographic demand, total are strengthening demand increased 40%, or 345Moz due to the increase in industrial and investment demand  Monetary

39. Slide 39: Silver Supply and Demand

    HECLA MINING COMPANY SILVER SUPPLY AND DEMAND NYSE: HL APRIL 2024 UPDATE 2022 SILVER DEMAND: 1,242MOZ 2022 SILVER SUPPLY: 1,005MOZ Other 3% Photo Recycling Mine Prod. - Jewelry and Other 18% voltaics Primary Silver Silverware 24% 25% 23% 25% Industrial and Consumer Products Brazing 45% Alloys Electr

40. Slide 40: Silver Is Essential in Solar Electricity Generation

    HECLA MINING COMPANY NYSE: HL SILVER IS ESSENTIAL IN SOLAR ELECTRICITY GENERATION APRIL 2024 UPDATE 1 Gigawatt (GW) of solar capacity requires 0.5Moz of silver U.S. Electricity Generation by Fuel: 2000-2050 Solar could account 2022 for 33% of total U.S. Gigawatt history | projections 6,000 energy ge

41. Slide 41: Photovoltaic (PV) Demand for Silver Is Growing

    HECLA MINING COMPANY NYSE: HL PHOTOVOLTAIC (PV) DEMAND FOR SILVER IS GROWING APRIL 2024 UPDATE PV Installations (Gigawatts) and Silver Silver Used in PVs, 2013-2024F** Loadings*,** PV Installations Ag Loading Moz PV Installations Silver Loading Gigawatts Index 2013 = 100 201 200 190 500 100 447 180

42. Slide 42: Silver Deficit Is Expected to Continue

    HECLA MINING COMPANY NYSE: HL SILVER DEFICIT IS EXPECTED TO CONTINUE APRIL 2024 UPDATE Silver demand is buoyed by PVs with newer silver technologies that use more silver  In 2022, silver deficit was 238Moz, 2023 forecast deficit is 142Moz*  Expect silver deficit to persist with increasing use of P

43. Slide 43: Widening Gap Between Silver Supply and Demand

    HECLA MINING COMPANY NYSE: HL WIDENING GAP BETWEEN SILVER SUPPLY AND DEMAND APRIL 2024 UPDATE Silver Supply and Demand: 2022 and 2030E (Millions oz) Supply needs to grow by >70Moz per year by 2030 with only 1.5% 1,187 growth in industrial demand 1,117 Supply shortfall of 112Moz in 2022 was filled by

44. Slide 44: Exploration

    EXPLORATION RESPONSIBLE. SAFE. INNOVATIVE. 44

45. Slide 45: Unique Exploration Due to Silver, Jurisdictions, Infrastructure, Potential

    UNIQUE EXPLORATION DUE TO SILVER, JURISDICTIONS, HECLA MINING COMPANY NYSE: HL INFRASTRUCTURE, POTENTIAL, GRADE, AND CAPITAL APRIL 2024 UPDATE 45

46. Slide 46: $25M Exploration Budget for 2024

    HECLA MINING COMPANY NYSE: HL DISCOVERING AND EXPANDING RESOURCES APRIL 2024 UPDATE Greens Creek ($9M) Focus on resource expansion and $25M conversion to expand and upgrade multiple ore zones Exploration Budget for 2024, focused on Keno Hill ($6.5M) Greens Creek and Exploration and definition drilli

47. Slide 47: 2023 Exploration Expands Mineralization in Multiple Zones

    2023 EXPLORATION EXPANDS MINERALIZATION IN MULTIPLE HECLA MINING COMPANY NYSE: HL ZONES GREENS APRILCREEK 2024 UPDATE Positive Results at 9a, West, 200 South, East, Gallagher, and Upper Plate Zones 2023 Drilling Results 2024 Underground 2024 Surface  Expanding high-grade mineralization to the west

48. Slide 48: Prospective Land Package in a Historical District

    HECLA MINING COMPANY NYSE: HL PROSPECTIVE LAND PACKAGE IN A HISTORICAL DISTRICT KENO HILL APRIL 2024 UPDATE  Historical production of over 200Moz of silver Silver District: Excellent Potential at 40 oz/Ag per ton Grades are 2x Greens Creek’s historical grades  Property contains excellent explorat

49. Slide 49: Exploration Drilling Confirms Significant Potential

    HECLA MINING COMPANY NYSE: HL EXPLORATION DRILLING CONFIRMS SIGNIFICANT POTENTIAL KENO HILL APRIL 2024 UPDATE Multiple intercepts significantly extend wider and high-grade mineralization internal to and at depth below current planned mining  Three veins in Bermingham deposit – Bear, B B’ Footwall,

50. Slide 50: Environmental, Social, Governance

    Environmental, Social, Governance Our sustainable ESG Corporate Governance responsibilities RESPONSIBLE. SAFE. INNOVATIVE. 50

51. Slide 51: Committed to Responsible Mining

    HECLA MINING COMPANY NYSE: HL COMMITTED TO RESPONSIBLE MINING APRIL 2024 UPDATE Mining Metals for a Green Energy Future Net zero on emissions in 2021, 2022 Well-established safety culture Hecla Charitable Foundation and 2023* San Sebastian Mine received the Casa Berardi received the Largest private-

52. Slide 52: Sustainability Rating Agency Scores: Significant Improvements Since 2019

    SUSTAINABILITY RATING AGENCY SCORES: SIGNIFICANT HECLA MINING COMPANY NYSE: HL IMPROVEMENTS SINCE 2019 APRIL 2024 UPDATE Agency Progression in ESG Scores • Overall Score increased from 53rd percentile to 74th percentile 38 • Governance Score increased to 24 78th percentile 15 13 • Environmental Scor

53. Slide 53: Hecla Is Among the Safest Mining Companies

    HECLA MINING COMPANY NYSE: HL HECLA IS AMONG THE SAFEST MINING COMPANIES APRIL 2024 UPDATE Implemented NMA’s CORESafety standards in 2012, became Industry leader All-Injury Frequency Rate Hecla’s 1.45 rate is 16% better 6.06 than national average 5.35 5.41 4.57 Industry leading 76% reduction since S

54. Slide 54: Committed to Our Communities

    HECLA MINING COMPANY NYSE: HL COMMITED TO OUR COMMUNITIES APRIL 2024 UPDATE Largest private employer within the Total economic impact in 2022 communities we operate, jobs and benefits that last a lifetime $833M  Total direct economic impact of $833 Hecla Corporate Montana million $103M $4M Greens C

55. Slide 55: Appendix: End Notes and GAAP Reconciliations

    APPENDIX End Notes and GAAP reconciliations RESPONSIBLE. SAFE. INNOVATIVE. 55

56. Slide 56: End Notes

    HECLA MINING COMPANY NYSE: HL END NOTES APRIL 2024 UPDATE 1. Net debt to adjusted EBITDA is a non-GAAP measurement, a reconciliation of adjusted EBITDA and net debt to the closest GAAP measurements of net income (loss) and debt can be found in the appendix. It is an important measure for management

57. Slide 57: GAAP Reconciliations

    GAAP RECONCILIATIONS RESPONSIBLE. SAFE. INNOVATIVE. 57

58. Slide 58: Adjusted EBITDA Reconciliation to GAAP

    HECLA MINING COMPANY NYSE: HL ADJUSTED EBITDA RECONCILIATION TO GAAP APRIL 2024 UPDATE Reconciliation of Net Loss (GAAP) to Adjusted EBITDA (non-GAAP) Last Twelve Months Q4 2023 Q3 2023 Dollars in thousands (USD) Net loss $ (84,217) $ (45,734) Interest expense 43,319 42,194 Income and mining tax exp

59. Slide 59: Cash Cost and AISC Reconciliation to GAAP

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP APRIL 2024 UPDATE Silver Total Cost of Sales (GAAP) to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Costs, Before By-product Credits, per Ounce and All-In Sustaini

60. Slide 60: Cash Cost and AISC Reconciliation to GAAP

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP APRIL 2024 UPDATE Greens Creek Total Cost of Sales (GAAP) to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Costs, Before By-product Credits, per Ounce and All-In Su

61. Slide 61: Cash Cost and AISC Reconciliation to GAAP

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP APRIL 2024 UPDATE Lucky Friday Total Cost of Sales (GAAP) to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Costs, Before By-product Credits, per Ounce and All-In Su

62. Slide 62: Cash Cost and AISC Reconciliation to GAAP

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP APRIL 2024 UPDATE Casa Berardi Total Cost of Sales (GAAP) to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Costs, Before By-product Credits, per Ounce and All-In Su

63. Slide 63: Cash Cost and AISC Reconciliation to GAAP

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP APRIL 2024 UPDATE 2024 Silver and Gold Estimates Reconciliation of Total Cost of Sales (GAAP) to Cash Cost, Before By-product Credits and Cash Cost, After By-product Credits (non-GAAP) and All-In Sustaining Costs, Before By-prod

64. Slide 64: Free Cash Flow (Non-GAAP) Reconciliation

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION APRIL 2024 UPDATE Reconciliation of cash provided by operating activities (GAAP) to Free Cash Flow (non-GAAP) for Greens Creek, Lucky Friday and Casa Berardi 2018 to 2023 Greens Total Lucky Friday Casa Berardi Creek in millions C

65. Slide 65: Free Cash Flow (Non-GAAP) Reconciliation

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION APRIL 2024 UPDATE Greens Creek reconciliation of cash provided by operating activities (GAAP) to free cash flow (non-GAAP) TOTAL 2023 2022 2021 2020 in millions Cash provided by operating activities 694 157 151 177 209 Additions

66. Slide 66: Free Cash Flow (Non-GAAP) Reconciliation

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION APRIL 2024 UPDATE Reconciliation of cash provided by operating activities (GAAP) to Free Cash Flow (non-GAAP) for Greens Creek, Lucky Friday and Casa Berardi 2018 to 2023 Total Greens Creek Lucky Friday Casa Berardi in millions C

67. Slide 67: Free Cash Flow (Non-GAAP) Reconciliation

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION APRIL 2024 UPDATE Greens Creek reconciliation of cash provided by operating activities (GAAP) to free cash flow (non-GAAP) TOTAL YTD 2023 2022 2021 2020 in millions Cash provided by operating activities 660 123 151 209 177 Additi

68. Slide 68: Mineral Reserves and Resources

    MINERAL RESERVES AND RESOURCES RESPONSIBLE. SAFE. INNOVATIVE. 68

69. Slide 69: Mineral Reserves - 12/31/2023 (1/2)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Reserves - 12/31/2023 (1) (1/2) APRIL 2024 UPDATE Proven Reserves (1) Silver Gold Lead Zinc Silver Gold Lead Zinc Asset Location Ownership Tons (000) (oz/ton) (oz/ton) % % (000 oz) (000 oz) (Tons) (Tons) Greens Creek (2,3) United States 10

70. Slide 70: Mineral Reserves - 12/31/2023 (2/2)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Reserves - 12/31/2023 (1) (2/2) APRIL 2024 UPDATE Proven & Probable Reserves Silver Gold Lead Zinc Silver Gold Lead Zinc Asset Location Ownership Tons (000) (oz/ton) (oz/ton) % % (000 oz) (000 oz) (Tons) (Tons) Greens Creek (2,3) United St

71. Slide 71: Mineral Resources - 12/31/2023 (1/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (1/4) APRIL 2024 UPDATE Measured Resources (9) Silver Gold Lead Zinc Copper Silver Gold Lead Zinc Copper Asset Location Ownership Tons (000) (oz/ton) (oz/ton) % % % (000 oz) (000 oz) (Tons) (Tons) (Tons) Greens C

72. Slide 72: Mineral Resources - 12/31/2023 (2/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (2/4) APRIL 2024 UPDATE Indicated Resources (10) Silver Gold Lead Zinc Copper Silver Gold Lead Zinc Copper Asset Location Ownership Tons (000) (oz/ton) (oz/ton) % % % (000 oz) (000 oz) (Tons) (Tons) (Tons) Greens

73. Slide 73: Mineral Resources - 12/31/2023 (3/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (3/4) APRIL 2024 UPDATE Measured & Indicated Resources Silver Gold Lead Zinc Copper Silver Gold Lead Zinc Copper Asset Location Ownership Tons (000) (oz/ton) (oz/ton) % % % (000 oz) (000 oz) (Tons) (Tons) (Tons)

74. Slide 74: Mineral Resources - 12/31/2023 (4/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (4/4) APRIL 2024 UPDATE Inferred Resources (11) Silver Gold Lead Zinc Copper Silver Gold Lead Zinc Copper Asset Location Ownership Tons (000) (oz/ton) (oz/ton) % % % (000 oz) (000 oz) (Tons) (Tons) (Tons) Greens

75. Slide 75: Mineral Reserves and Resources Footnotes

    HECLA MINING COMPANY NYSE: HL MINERAL RESERVES AND RESOURCES FOOTNOTES APRIL 2024 UPDATE Note: All estimates are in-situ except for the proven reserves at Greens Creek which are in surface stockpiles. Mineral resources are exclusive of reserves. 1. The term “reserve” means an estimate of tonnage and

76. Slide 76: Mineral Reserves and Resources Footnotes

    HECLA MINING COMPANY NYSE: HL MINERAL RESERVES AND RESOURCES FOOTNOTES APRIL 2024 UPDATE 17. Indicated resources for most zones at San Sebastian based on $1,500/oz gold, $21/oz silver, $1.15/lb lead, $1.35/lb zinc and $3.00/lb copper using a cut-off grade of $90.72/ton ($100/tonne); $1,700/oz gold u

77. Slide 77: Thank You

    THANK YOU RESPONSIBLE. SAFE. INNOVATIVE.

Hecla Mining Company — Investor Presentation (April 2024) on 6ix