XML 61 R47.htm IDEA: XBRL DOCUMENT
v3.25.3

Note 8 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 lb oz $ / £ $ / oz | Dec. 31, 2024 lb oz $ / oz $ / £
Silver 2025 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 780 | 1,535
Underlying, Derivative Mass | $ / oz | 39.15 | 31.46
Gold 2025 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 0 | 2
Underlying, Derivative Mass | $ / oz |  | 2,673
Zinc 2025 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 16,424 | 20,834
Underlying, Derivative Mass | $ / £ | 1.39 | 1.4
Zinc 2026 Settlements for Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 3,748 |
Underlying, Derivative Mass | $ / £ | 1.4 |
Lead Two Thousand Twenty Five Settlements For Provisional Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 11,905 | 14,661
Underlying, Derivative Mass | $ / £ | 1 | 0.97
Zinc 2025 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 2,425 | 59,194
Underlying, Derivative Mass | $ / £ | 1.36 | 1.39
Zinc 2026 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 37,644 | 6,283
Underlying, Derivative Mass | $ / £ | 1.33 | 1.41
Lead 2025 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 4,850 | 47,840
Underlying, Derivative Mass | $ / £ | 0.99 | 0.99
Lead 2026 Settlements For Forecasted Sale |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 53,903 | 52,911
Underlying, Derivative Mass | $ / £ | 1.03 | 1.03

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 20 -Name Accounting Standards Codification -Section 25 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480237/815-40-50-5 + Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal mass used to calculate payments on a derivative instrument. + References No definition available. + Details
Name: | us-gaap_DerivativeNonmonetaryNotionalAmountMass
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:massItemType
Balance Type: | na
Period Type: | duration

X
- Definition Specified interest rate, security price, commodity price, foreign exchange rate, index of prices or rates for a derivative contract measured in mass but not the derivative contract itself. + References No definition available. + Details
Name: | us-gaap_UnderlyingDerivativeMass
Namespace Prefix: | us-gaap_
Data Type: | srt-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_SilverTwoThousandTwentyFiveSettlementsForProvisionalSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_GoldTwoThousandTwentyFiveSettlementsForProvisionalSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_ZincTwoThousandTwentyFiveSettlementsForProvisionalSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_ZincTwoThousandTwentySixSettlementsForProvisionalSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_LeadTwoThousandTwentyFiveSettlementsForProvisionalSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_Zinc2025SettlementsForForecastedSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_Zinc2026SettlementsForForecastedSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_Lead2025SettlementsForForecastedSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_Lead2026SettlementsForForecastedSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |