Hecla Mining Company · NYSE:HL

Hecla Mining — Investor Presentation (May 2024)

74 slides from Hecla Mining's investor presentation, May 2024

1. Slide 1: May 2024 Update

   Largest U.S. silver producer, soon-to-be largest Canadian silver producer MAY 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 MAY 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 a

4. Slide 4: Safe and Sustainable Mining

   HECLA MINING COMPANY NYSE: HL SAFE AND SUSTAINABLE MINING MAY 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 l

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 Source: Company Reports, World Silver Survey 2024, MAY 2024 UPDATE World Production of Silver 2023 U.S. Silver Production (Moz) 23% Mexico Three countries Peru 14.3 Hecla is the largest silver produce ~48% of China prod

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 MAY 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 r

7. Slide 7: Low-Cost Profile Silver Assets

   HECLA MINING COMPANY NYSE: HL LOW-COST PROFILE SILVER ASSETS MAY 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) So

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

   HECLA MINING COMPANY NYSE: HL LEADING DIVIDEND POLICY WITH SILVER LINKED DIVIDEND MAY 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 Div

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 MAY 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 renewabl

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

    HECLA MINING COMPANY NYSE: HL WORLD’S 11th LARGEST SILVER MINE GREENS MAYCREEK 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  $2.

12. Slide 12: Continuous Improvement Since Acquisition

    HECLA MINING COMPANY NYSE: HL CONTINUOUS IMPROVEMENT SINCE ACQUISITION GREENS MAYCREEK 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 2,157

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

    HECLA MINING COMPANY NYSE: HL CONSISTENCY & INNOVATION  FREE CASH FLOW ENGINE GREENS MAYCREEK 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 requirements

14. Slide 14: Lucky Friday: Positioned for Growth

    HECLA MINING COMPANY NYSE: HL LUCKY FRIDAY: POSITIONED FOR GROWTH LUCKY FRIDAY MAY 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 f

15. Slide 15: Innovation Driven Growth

    HECLA MINING COMPANY NYSE: HL INNOVATION DRIVEN GROWTH LUCKY FRIDAY MAY 2024 UPDATE 2nd Cornerstone Asset, Mine plan of 19 Years  Poised to be a 5Moz silver producer  Ramp-up complete in Q1/24, Achieved record mill throughput over multiple days in March, exceeding 1,300 tpd  Expect $50M in insura

16. Slide 16: Strong Labor Relations

    HECLA MINING COMPANY NYSE: HL STRONG LABOR RELATIONS LUCKY FRIDAY MAY 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 H

17. Slide 17: Potential for Growth at Depth

    HECLA MINING COMPANY POTENTIAL FOR GROWTH AT DEPTH NYSE: HL MAY 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 Eas

18. Slide 18: Underhand Closed Bench Method

    HECLA MINING COMPANY NYSE: HL UNDERHAND CLOSED BENCH METHOD LUCKY FRIDAY MAY 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 an

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 MAY 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 19

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

    HECLA MINING COMPANY NYSE: HL KENO HILL: PRODUCTION GROWTH IN YUKON KENO HILL MAY 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 Direct

21. Slide 21: Building a Strong Foundation

    HECLA MINING COMPANY NYSE: HL BUILDING A STRONG FOUNDATION KENO HILL MAY 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, Significant

22. Slide 22: Keno Hill Technical Report Highlights

    HECLA MINING COMPANY NYSE: HL KENO HILL TECHNICAL REPORT HIGHLIGHTS KENO HILL MAY 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 P

23. Slide 23: Development – Bermingham

    HECLA MINING COMPANY NYSE: HL DEVELOPMENT – BERMINGHAM KENO HILL MAY 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 MAY 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 CASAMAY 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 Econom

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

    HECLA MINING COMPANY NYSE: HL CASA BERARDI: EXECUTING ON SURFACE TRANSITION PLAN CASAMAY BERARDI 2024 UPDATE Technical report demonstrates long- term value in pits with a 14-year reserve mine plan  Ongoing transition to complete surface operation, focus on predictability of costs Stope-by-stope an

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

    HECLA MINING COMPANY NYSE: HL OPEN PIT TRANSITION CAN UNLOCK SIGNIFICANT VALUE CASAMAY 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 produ

28. Slide 28: Casa Berardi Technical Report Highlights

    HECLA MINING COMPANY NYSE: HL CASA BERARDI TECHNICAL REPORT HIGHLIGHTS CASAMAY 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. MAY 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 auth

30. Slide 30: Financial Review

    FINANCIAL REVIEW RESPONSIBLE. SAFE. INNOVATIVE. 30

31. Slide 31: First Quarter Financial Highlights

    HECLA MINING COMPANY NYSE: HL FIRST QUARTER FINANCIAL HIGHLIGHTS MAY 2024 UPDATE Q1/24 Revenues By Metal Strong Silver Margins Net Debt to Adjusted EBITDA ($/silver ounce) ($ Millions) Silver’s share of revenues is Margins are ~50% of silver price 2024: Achieve target of < 2x increasing Realized Pri

32. Slide 32: 2024 Focus: Maintain Financial Flexibility

    HECLA MINING COMPANY NYSE: HL 2024 FOCUS: MAINTAIN FINANCIAL FLEXIBILITY MAY 2024 UPDATE 2024 Priorities: Free Cash Flow: Greens Creek, Lucky Friday ($ Million)  Invest in Keno Hill ramp-up Free Cash Flow (2)  Target Net Debt to Adjusted EBITDA of < 2x 2020 – Q1/2024: Expect increased EBITDA gene

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

    HECLA MINING COMPANY NYSE: HL 2023 REVENUE, PRODUCTION, AND COST HIGHLIGHTS MAY 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(4)

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 MAY 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 40.0

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

    HECLA MINING COMPANY NYSE: HL GUIDANCE – 2024 PRODUCTION AND COSTS BY OPERATION MAY 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 MAY 2024 UPDATE Five distinct periods of silver demand, three that Despite decrease in photographic demand, total are strengthening demand increased 35%, or 307Moz due to the increase in industrial and investment demand  Monetary by

39. Slide 39: Silver Supply and Demand

    HECLA MINING COMPANY NYSE: HL SILVER SUPPLY AND DEMAND MAY 2024 UPDATE 2023 SILVER DEMAND: 1,195MOZ 2023 SILVER SUPPLY: 1,010MOZ Other 3% Jewelry and Silverware Photo Recycling Mine Prod. - Other 18% Primary Silver 22% voltaics 24% 23% 29% Brazing Alloys Electronics 49% Mine Prod. - and Investment I

40. Slide 40: Solar Will Be the Largest Source of Electricity

    HECLA MINING COMPANY NYSE: HL SOLAR WILL BE THE LARGEST SOURCE OF ELECTRICITY MAY 2024 UPDATE 1 Gigawatt (GW) of solar capacity requires 0.45Moz of silver U.S. Electricity Generation Sources: 2000-2050 2022 Solar projected to be 33% of total Gigawatt history | projections U.S. energy generation by 2

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

    HECLA MINING COMPANY NYSE: HL PHOTOVOLTAIC (PV) DEMAND FOR SILVER IS GROWING MAY 2024 UPDATE PV Installations (Gigawatts) and Silver Silver Used in PVs, 2013-2024F** Loadings*,** PV Installations Ag Loading Moz PV Installations Silver Loading 240 232 Gigawatts Index 2014 = 100 700 100 220 90 200 193

42. Slide 42: More Efficient PV Technologies Use More Silver

    MORE EFFICIENT PV TECHNOLOGIES USE MORE SILVER AND ARE HECLA MINING COMPANY NYSE: HL GAINING MARKET SHARE MAY 2024 UPDATE Silver Content in PV Technologies Market Share of PV Technologies Mg Silver/Watt Higher silver using technologies are gaining 22 market share PV Installations Newer, more efficie

43. Slide 43: Silver Deficit Is Expected to Continue

    HECLA MINING COMPANY NYSE: HL SILVER DEFICIT IS EXPECTED TO CONTINUE MAY 2024 UPDATE Silver demand is buoyed by PVs with newer silver technologies that use more silver  In 2023, silver deficit was 184Moz, 2024 forecast deficit is 215Moz*  Expect silver deficit to persist with increasing use of PVs

44. Slide 44: Exploration

    EXPLORATION RESPONSIBLE. SAFE. INNOVATIVE. 44

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

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

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

    HECLA MINING COMPANY NYSE: HL DISCOVERING AND EXPANDING RESOURCES MAY 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 drilling

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

    2023 EXPLORATION EXPANDS MINERALIZATION IN MULTIPLE HECLA MINING COMPANY NYSE: HL ZONES GREENS MAYCREEK 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 in

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

    HECLA MINING COMPANY NYSE: HL PROSPECTIVE LAND PACKAGE IN A HISTORICAL DISTRICT KENO HILL MAY 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 exploratio

49. Slide 49: Exploration Drilling Confirms Significant Potential

    HECLA MINING COMPANY NYSE: HL EXPLORATION DRILLING CONFIRMS SIGNIFICANT POTENTIAL KENO HILL MAY 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, Ma

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 MAY 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-se

52. Slide 52: Sustainability Rating Agency Scores

    SUSTAINABILITY RATING AGENCY SCORES: SIGNIFICANT HECLA MINING COMPANY NYSE: HL IMPROVEMENTS SINCE 2019 MAY 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 Score

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

    HECLA MINING COMPANY NYSE: HL HECLA IS AMONG THE SAFEST MINING COMPANIES MAY 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 SHM

54. Slide 54: Committed to Our Communities

    HECLA MINING COMPANY NYSE: HL COMMITED TO OUR COMMUNITIES MAY 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 Cre

55. Slide 55: Appendix

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

56. Slide 56: End Notes

    HECLA MINING COMPANY NYSE: HL END NOTES MAY 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 to

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 MAY 2024 UPDATE Reconciliation of Net Loss (GAAP) to Adjusted EBITDA (non-GAAP) Last Twelve Months Q1 2024 Q4 2023 Dollars in thousands (USD) Net loss $ (86,797) $ (84,217) Interest expense 45,798 43,319 Income and mining tax expen

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

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP MAY 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 Sustaining

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

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP MAY 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 Sust

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

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP MAY 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 Sust

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

    HECLA MINING COMPANY NYSE: HL CASH COST AND AISC RECONCILIATION TO GAAP MAY 2024 UPDATE Casa Berardi and Total Gold 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

63. Slide 63: Free Cash Flow (Non-GAAP) Reconciliation

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION MAY 2024 UPDATE Reconciliation of cash provided by operating activities (GAAP) to Free Cash Flow (non-GAAP) for Greens Creek and Lucky Friday 2020 to Q1 2024 TOTAL Q1 2024 2023 2022 2021 2020 in millions Cash provided by operatin

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

    HECLA MINING COMPANY NYSE: HL FREE CASH FLOW (NON-GAAP) RECONCILIATION MAY 2024 UPDATE Greens Creek reconciliation of cash provided by operating activities (GAAP) to free cash flow (non-GAAP) TOTAL Q1 2024 2023 2022 2021 2020 in millions Cash provided by operating activities 723 29 157 151 177 209 A

65. Slide 65: Mineral Reserves and Resources

    MINERAL RESERVES AND RESOURCES RESPONSIBLE. SAFE. INNOVATIVE. 65

66. Slide 66: Mineral Reserves - 12/31/2023 (1/2)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Reserves - 12/31/2023 (1) (1/2) MAY 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 100.

67. Slide 67: Mineral Reserves - 12/31/2023 (2/2)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Reserves - 12/31/2023 (1) (2/2) MAY 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 Stat

68. Slide 68: Mineral Resources - 12/31/2023 (1/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (1/4) MAY 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 Cre

69. Slide 69: Mineral Resources - 12/31/2023 (2/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (2/4) MAY 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 C

70. Slide 70: Mineral Resources - 12/31/2023 (3/4)

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (3/4) MAY 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) Gr

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

    HECLA MINING COMPANY NYSE: HL Hecla Mining Company - Mineral Resources - 12/31/2023 (8) (4/4) MAY 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 Cr

72. Slide 72: Mineral Reserves and Resources Footnotes

    HECLA MINING COMPANY NYSE: HL MINERAL RESERVES AND RESOURCES FOOTNOTES MAY 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 g

73. Slide 73: Mineral Reserves and Resources Footnotes

    HECLA MINING COMPANY NYSE: HL MINERAL RESERVES AND RESOURCES FOOTNOTES MAY 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 use

74. Slide 74: Thank You

    THANK YOU RESPONSIBLE. SAFE. INNOVATIVE.

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