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Management - Labor Relations (Details) | 12 Months Ended
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Dec. 31, 2021 numberOfEmployee numberOfMine
Concentration Risk [Line Items] |
Number of employees | 4,900
Number of hourly employees | 3,900
Hourly employees represented by organized labor unions (in percent) | 34.00%
Coal production generated by hourly employees represented by organized labor unions (in percent) | 16.00%
Number of us mines represented by unions | numberOfMine | 1
Represented by Organized Labor Union | Kayenta Mine |
Concentration Risk [Line Items] |
Number of employees | 15
Represented by Organized Labor Union | Shoal Creek |
Concentration Risk [Line Items] |
Number of employees | 280
Represented by Organized Labor Union | Wilpinjong Mine |
Concentration Risk [Line Items] |
Number of employees | 480
Represented by Organized Labor Union | Coppabella Mine |
Concentration Risk [Line Items] |
Number of employees | 280
Represented by Organized Labor Union | Moorvale Mine |
Concentration Risk [Line Items] |
Number of employees | 150
Represented by Organized Labor Union | Metropolitan Underground Mine |
Concentration Risk [Line Items] |
Number of employees | 145
Represented by Organized Labor Union | Metropolitan Prep Plant |
Concentration Risk [Line Items] |
Number of employees | 20
Represented by Organized Labor Union | Wambo Underground Mine |
Concentration Risk [Line Items] |
Number of employees | 75
Represented by Organized Labor Union | Wambo Prep Plant |
Concentration Risk [Line Items] |
Number of employees | 20

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- Details
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