XML 64 R47.htm IDEA: XBRL DOCUMENT
v3.23.3

Note 8 - Derivative Instruments - Summary of Forward Sales Contracts (Details) oz in Thousands, lb in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 lb oz $ / $ $ / oz | Dec. 31, 2022 oz lb $ / $ $ / oz
Silver 2023 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 931 | 3,124
Underlying, Derivative Mass | $ / oz | 23.3 | 21.55
Gold 2023 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  | 8
Underlying, Derivative Mass | $ / oz |  | 1,795
Zinc 2023 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 18,629
Underlying, Derivative Mass | $ / $ |  | 1.38
Lead 2023 Settlements For Provisional Sales Member |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 11,188 | 11,960
Underlying, Derivative Mass | $ / $ | 1 | 0.98
Silver2023 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | oz | 0 |
Zinc 2023 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 441 | 37,533
Underlying, Derivative Mass | $ / $ | 1.51 | 1.34
Lead 2023 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 7,992 | 75,618
Underlying, Derivative Mass | $ / $ | 0.99 | 1
Lead 2024 Settlements for Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 74,902 | 45,856
Underlying, Derivative Mass | $ / $ | 0.97 | 0.99
Lead 2025 Settlements For Forecasted Sales [Member] |  |
Derivative [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 44,754 |
Underlying, Derivative Mass | $ / $ | 0.97 |

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/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_SilverTwoThousandTwentyThreeSettlementsForProvisionalSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_Silver2023SettlementsForForecastedSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_Zinc2023SettlementsForForecastedSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_Lead2023SettlementsForForecastedSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=hl_Lead2024SettlementsForForecastedSalesMember
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: |