Hecla Mining Company · NYSE:HL

Hecla Mining — John Tumazos Very Independent Research 2024 Virtual Conference

78 slides from Hecla Mining's conference presentation, Mar 19, 2024

1. Slide 1: John Tumazos Very Independent Research 2024 Virtual Conference

   Largest U.S. silver producer, soon-to-be largest Canadian silver producer JOHN TUMAZOS VERY INDEPENDENT RESEARCH 2024 VIRTUAL CONFERENCE March 19, 2024 RESPONSIBLE. SAFE. INNOVATIVE.

2. Slide 2: Cautionary Statements

   HECLA MINING COMPANY NYSE: HL CAUTIONARY STATEMENTS TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

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

   HECLA MINING COMPANY NYSE: HL WHAT MAKES HECLA THE PREMIER SILVER INVESTMENT TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

4. Slide 4: Safe and Sustainable Mining

   HECLA MINING COMPANY NYSE: HL SAFE AND SUSTAINABLE MINING TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

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 TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

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 TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 Silver Reserves and Reserve Grade* Silver Reserves (Moz) Silver Grade (g/t) Silver Reserves (Moz) in U.S. and Canada 487 455 445 313 244 238 217 205 169 109 108 57 62 23 15 3

7. Slide 7: Low-Cost Profile Silver Assets

   HECLA MINING COMPANY NYSE: HL LOW-COST PROFILE SILVER ASSETS TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 80,000 100,000 120,00

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

   HECLA MINING COMPANY NYSE: HL LEADING DIVIDEND POLICY WITH SILVER LINKED DIVIDEND TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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. Silve

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 TUMAZOS VIRTUAL GREENS CREEK CONFERENCE, March 20, 2024 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

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

    HECLA MINING COMPANY NYSE: HL WORLD’S 11th LARGEST SILVER MINE TUMAZOS VIRTUAL GREENS CREEK CONFERENCE, March 20, 2024 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 cas

12. Slide 12: Continuous Improvement Since Acquisition

    HECLA MINING COMPANY NYSE: HL CONTINUOUS IMPROVEMENT SINCE ACQUISITION TUMAZOS VIRTUAL GREENS CREEK CONFERENCE, March 20, 2024 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

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

    HECLA MINING COMPANY NYSE: HL CONSISTENCY & INNOVATION  FREE CASH FLOW ENGINE TUMAZOS VIRTUAL GREENS CREEK CONFERENCE, March 20, 2024 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, lo

14. Slide 14: Lucky Friday: Positioned for Growth

    HECLA MINING COMPANY NYSE: HL LUCKY FRIDAY: POSITIONED FOR GROWTH TUMAZOS VIRTUAL LUCKY FRIDAY CONFERENCE, March 20, 2024 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 hydro

15. Slide 15: Innovation Driven Growth

    HECLA MINING COMPANY NYSE: HL INNOVATION DRIVEN GROWTH TUMAZOS VIRTUAL LUCKY FRIDAY CONFERENCE, March 20, 2024 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 ins

16. Slide 16: Completed Mitigation Plans for Secondary Egress

    HECLA MINING COMPANY NYSE: HL COMPLETED MITIGATION PLANS FOR SECONDARY EGRESS TUMAZOS VIRTUAL LUCKY FRIDAY CONFERENCE, March 20, 2024 Vent Bypass Raise Escape Raise and Ramp Escape Raise 290 feet 4050 Alimak Ventilation Raise 850 feet Ramp – 1,600 feet 16

17. Slide 17: Strong Labor Relations

    HECLA MINING COMPANY NYSE: HL STRONG LABOR RELATIONS TUMAZOS VIRTUAL LUCKY FRIDAY CONFERENCE, March 20, 2024 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 mon

18. Slide 18: Potential for Growth at Depth

    HECLA MINING COMPANY POTENTIAL FOR GROWTH AT DEPTH NYSE: HL TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 <

19. Slide 19: Underhand Closed Bench Method

    HECLA MINING COMPANY NYSE: HL UNDERHAND CLOSED BENCH METHOD TUMAZOS VIRTUAL LUCKY FRIDAY CONFERENCE, March 20, 2024 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

20. Slide 20: Best Decade in 80 Year History Is Ahead

    HECLA MINING COMPANY NYSE: HL BEST DECADE IN 80 YEAR HISTORY IS AHEAD TUMAZOS VIRTUAL LUCKY FRIDAY CONFERENCE, March 20, 2024 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 2

21. Slide 21: Keno Hill: Production Growth in Yukon

    HECLA MINING COMPANY NYSE: HL KENO HILL: PRODUCTION GROWTH IN YUKON TUMAZOS VIRTUAL KENO HILL CONFERENCE, March 20, 2024 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 hydro

22. Slide 22: Building a Strong Foundation

    HECLA MINING COMPANY NYSE: HL BUILDING A STRONG FOUNDATION TUMAZOS VIRTUAL KENO HILL CONFERENCE, March 20, 2024 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 8

23. Slide 23: Keno Hill Technical Report Highlights

    HECLA MINING COMPANY NYSE: HL KENO HILL TECHNICAL REPORT HIGHLIGHTS TUMAZOS VIRTUAL KENO HILL CONFERENCE, March 20, 2024 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 Produc

24. Slide 24: Development – Bermingham

    HECLA MINING COMPANY NYSE: HL DEVELOPMENT – BERMINGHAM TUMAZOS VIRTUAL KENO HILL CONFERENCE, March 20, 2024 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 ~

25. Slide 25: Development – Flame & Moth

    HECLA MINING COMPANY NYSE: HL DEVELOPMENT – FLAME & MOTH TUMAZOS VIRTUAL KENO HILL CONFERENCE, March 20, 2024 Development plan: Looking northwest Production shapes: Initial Production Area Christal Zone Lightning Zone ~100m 25

26. Slide 26: Casa Berardi: Gold Exposure in Quebec

    HECLA MINING COMPANY NYSE: HL CASA BERARDI: GOLD EXPOSURE IN QUEBEC TUMAZOS VIRTUAL CASA BERARDI CONFERENCE, March 20, 2024 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 hydropo

27. Slide 27: Casa Berardi: Executing on Surface Transition Plan

    HECLA MINING COMPANY NYSE: HL CASA BERARDI: EXECUTING ON SURFACE TRANSITION PLAN TUMAZOS VIRTUAL CASA BERARDI CONFERENCE, March 20, 2024 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 an

28. Slide 28: Open Pit Transition Can Unlock Significant Value

    HECLA MINING COMPANY NYSE: HL OPEN PIT TRANSITION CAN UNLOCK SIGNIFICANT VALUE TUMAZOS VIRTUAL CASA BERARDI CONFERENCE, March 20, 2024 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

29. Slide 29: Casa Berardi Technical Report Highlights

    HECLA MINING COMPANY NYSE: HL CASA BERARDI TECHNICAL REPORT HIGHLIGHTS TUMAZOS VIRTUAL CASA BERARDI CONFERENCE, March 20, 2024 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 0.1

30. Slide 30: 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. TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 Located 50 miles from Lucky Friday Working to advance underground data with great exploration potential collection and permitting Permitting strategy  Executin

31. Slide 31: Financial Review

    FINANCIAL REVIEW RESPONSIBLE. SAFE. INNOVATIVE. 31

32. Slide 32: 2023 Financial Highlights

    HECLA MINING COMPANY NYSE: HL 2023 FINANCIAL HIGHLIGHTS TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 Realiz

33. Slide 33: Investing for Production Growth

    HECLA MINING COMPANY NYSE: HL INVESTING FOR PRODUCTION GROWTH TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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)

34. Slide 34: 2023 Revenue, Production, and Cost Highlights

    HECLA MINING COMPANY NYSE: HL 2023 REVENUE, PRODUCTION, AND COST HIGHLIGHTS TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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,

35. Slide 35: Guidance

    GUIDANCE RESPONSIBLE. SAFE. INNOVATIVE.

36. Slide 36: Guidance – Strong Silver Production Growth

    HECLA MINING COMPANY NYSE: HL GUIDANCE – STRONG SILVER PRODUCTION GROWTH TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 15-20% Silver production growth in 2024, 30% by 2026 Silver Production (Moz) Gold Production (Koz) Silver Equivalent (Moz) Gold Equivalent (Koz) Consolidated 2024 Total 16.5 - 17.5 121

37. Slide 37: Guidance – 2024 Production and Costs by Operation

    HECLA MINING COMPANY NYSE: HL GUIDANCE – 2024 PRODUCTION AND COSTS BY OPERATION TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 Fr

38. Slide 38: Silver Market

    SILVER MARKET RESPONSIBLE. SAFE. INNOVATIVE. 38

39. Slide 39: The World's Growing Needs for Silver

    HECLA MINING COMPANY NYSE: HL THE WORLD’S GROWING NEEDS FOR SILVER TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 inve

40. Slide 40: Silver Supply and Demand

    HECLA MINING COMPANY SILVER SUPPLY AND DEMAND NYSE: HL TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

41. Slide 41: Silver Is Essential in Solar Electricity Generation

    HECLA MINING COMPANY NYSE: HL SILVER IS ESSENTIAL IN SOLAR ELECTRICITY GENERATION TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 1 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

42. Slide 42: Photovoltaic (PV) Demand for Silver Is Growing

    HECLA MINING COMPANY NYSE: HL PHOTOVOLTAIC (PV) DEMAND FOR SILVER IS GROWING TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

43. Slide 43: Silver Deficit Is Expected to Continue

    HECLA MINING COMPANY NYSE: HL SILVER DEFICIT IS EXPECTED TO CONTINUE TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

44. Slide 44: Widening Gap Between Silver Supply and Demand

    HECLA MINING COMPANY NYSE: HL WIDENING GAP BETWEEN SILVER SUPPLY AND DEMAND TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 112

45. Slide 45: Exploration

    EXPLORATION RESPONSIBLE. SAFE. INNOVATIVE. 45

46. Slide 46: Unique Exploration Due to Silver, Jurisdictions, Infrastructure, Potential, Grade, and Capital

    UNIQUE EXPLORATION DUE TO SILVER, JURISDICTIONS, HECLA MINING COMPANY NYSE: HL INFRASTRUCTURE, POTENTIAL, GRADE, AND CAPITAL TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 46

47. Slide 47: $25M Exploration Budget for 2024

    HECLA MINING COMPANY NYSE: HL DISCOVERING AND EXPANDING RESOURCES TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 Explorat

48. Slide 48: 2023 Exploration Expands Mineralization in Multiple Zones

    2023 EXPLORATION EXPANDS MINERALIZATION IN MULTIPLE HECLA MINING COMPANY NYSE: HL ZONES TUMAZOS VIRTUAL GREENS CREEK CONFERENCE, March 20, 2024 Positive Results at 9a, West, 200 South, East, Gallagher, and Upper Plate Zones 2023 Drilling Results 2024 Underground 2024 Surface  Expanding high-grade m

49. Slide 49: Prospective Land Package in a Historical District

    HECLA MINING COMPANY NYSE: HL PROSPECTIVE LAND PACKAGE IN A HISTORICAL DISTRICT TUMAZOS VIRTUAL KENO HILL CONFERENCE, March 20, 2024  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 co

50. Slide 50: Exploration Drilling Confirms Significant Potential

    HECLA MINING COMPANY NYSE: HL EXPLORATION DRILLING CONFIRMS SIGNIFICANT POTENTIAL TUMAZOS VIRTUAL KENO HILL CONFERENCE, March 20, 2024 Multiple intercepts significantly extend wider and high-grade mineralization internal to and at depth below current planned mining  Three veins in Bermingham deposi

51. Slide 51: Environmental, Social, Governance

    Environmental, Social, Governance Our sustainable ESG Corporate Governance responsibilities RESPONSIBLE. SAFE. INNOVATIVE. 51

52. Slide 52: Committed to Responsible Mining

    HECLA MINING COMPANY NYSE: HL COMMITTED TO RESPONSIBLE MINING TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 rece

53. Slide 53: Sustainability Rating Agency Scores: Significant Improvements Since 2019

    SUSTAINABILITY RATING AGENCY SCORES: SIGNIFICANT HECLA MINING COMPANY NYSE: HL IMPROVEMENTS SINCE 2019 TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 Agency Progression in ESG Scores • Overall Score increased from 53rd percentile to 74th percentile 38 • Governance Score increased to 24 78th percentile 1

54. Slide 54: Hecla Is Among the Safest Mining Companies

    HECLA MINING COMPANY NYSE: HL HECLA IS AMONG THE SAFEST MINING COMPANIES TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 lead

55. Slide 55: Committed to Our Communities

    HECLA MINING COMPANY NYSE: HL COMMITED TO OUR COMMUNITIES TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 m

56. Slide 56: Appendix

    APPENDIX End Notes and GAAP reconciliations RESPONSIBLE. SAFE. INNOVATIVE. 56

57. Slide 57: End Notes

    HECLA MINING COMPANY NYSE: HL END NOTES TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 importan

58. Slide 58: GAAP Reconciliations

    GAAP RECONCILIATIONS RESPONSIBLE. SAFE. INNOVATIVE. 58

59. Slide 59: Adjusted EBITDA Reconciliation to GAAP

    HECLA MINING COMPANY NYSE: HL ADJUSTED EBITDA RECONCILIATION TO GAAP TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

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

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

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

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

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

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

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

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

64. Slide 64: Cash Cost and AISC Reconciliation to GAAP

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 Sustain

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

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 Be

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

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 1

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

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 C

68. Slide 68: Free Cash Flow (Non-GAAP) Reconciliation

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 6

69. Slide 69: Mineral Reserves and Resources

    MINERAL RESERVES AND RESOURCES RESPONSIBLE. SAFE. INNOVATIVE. 69

70. Slide 70: Mineral Reserves - 12/31/2023 (1/2)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Reserves - 12/31/2023 (1) (1/2) TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 Cre

71. Slide 71: Mineral Reserves - 12/31/2023 (2/2)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Reserves - 12/31/2023 (1) (2/2) TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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) Gre

72. Slide 72: Mineral Resources - 12/31/2023 (1/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (1/4) TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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) (Ton

73. Slide 73: Mineral Resources - 12/31/2023 (2/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (2/4) TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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) (T

74. Slide 74: Mineral Resources - 12/31/2023 (3/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (3/4) TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

75. Slide 75: Mineral Resources - 12/31/2023 (4/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (4/4) TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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) (To

76. Slide 76: Mineral Reserves and Resources Footnotes

    HECLA MINING COMPANY NYSE: HL MINERAL RESERVES AND RESOURCES FOOTNOTES TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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 a

77. Slide 77: Mineral Reserves and Resources Footnotes

    HECLA MINING COMPANY NYSE: HL MINERAL RESERVES AND RESOURCES FOOTNOTES TUMAZOS VIRTUAL CONFERENCE, March 20, 2024 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

78. Slide 78: Thank You

    THANK YOU RESPONSIBLE. SAFE. INNOVATIVE.

Hecla Mining Company — John Tumazos Very Independent Research 2024 Virtual Conference on 6ix