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Management - Labor Relations (Tables) | 12 Months Ended
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Dec. 31, 2020
Risks and Uncertainties [Abstract] |
Schedule of operations with employees represented by labor unions | The following table presents the Company’s active mining operations as of December 31, 2020 in which the employees are represented by organized labor unions:
Mine |  | Current Agreement Expiration Date
U.S. |  |
Kayenta (1) |  | November 2024
Shoal Creek (2) |  | April 2021
Australia |  |
Owner-operated mines: |  |
Wilpinjong (3) |  | May 2020
Moorvale (4) |  | June 2017
Metropolitan (5) |  | January 2021
Wambo Underground (6) |  | March 2021
Coppabella (7) |  | June 2021
Wambo Open-Cut (6) |  | March 2022
(1) Prior to its closure in 2019, hourly workers at the Company’s Kayenta Mine in Arizona were represented by the UMWA under the Western Surface Agreement, which was effective through September 16, 2019. The Company concluded negotiations with the UMWA for a 4 year agreement covering the hourly workers expected to be involved in mining reclamation. (2) Hourly workers at the Company’s Shoal Creek Mine in Alabama are represented by the UMWA under the Shoal Creek Wage Agreement, which is effective through April 1, 2021. This agreement covers hourly employees who generated approximately 1% of the Company’s U.S. production during the year ended December 31, 2020. The hourly employees at the mine are temporarily laid off for an extended period and the Company issued a notice to the union in January 2021 to terminate the labor agreement and commence negotiations for a new agreement. (3) The current Wilpinjong labor agreement for Wilpinjong Mine expired in May 2020. Management, employees and the union are currently negotiating a new agreement. Hourly employees of this mine comprise approximately 39% of the Company’s Australian subsidiaries’ hourly employees, who generated approximately 59% of the Company’s Australian production during the year ended December 31, 2020. (4) Employees of the Company’s Moorvale Mine operate on individual contracts underpinned by a non-union enterprise agreement. Employees are managed according to their individual contracts rather than the enterprise agreement. The current memorandum of understanding agreeing to a rollover of the existing enterprise agreement expires in June 2023. Hourly employees of this mine comprise approximately 15% of the Company’s Australian subsidiaries’ hourly employees, who generated approximately 5% of the Company’s Australian production during the year ended December 31, 2020. (5) Employees of the Company’s Metropolitan Mine operate under a separate labor agreement, which expires in January 2021. Management, employees and the union have commenced negotiations for a new agreement. There is also a deputy labor agreement which expires in April 2022. During 2019, the Company insourced the operation of the Metropolitan coal handling and preparation plant and the hourly employees are employed under a separate labor agreement that expires in May 2021. Hourly employees of this mine comprise approximately 14% of the Company’s Australian subsidiaries’ hourly employees, who generated approximately 4% of the Company’s Australian production during the year ended December 31, 2020. (6) Employees of the Wambo Open-Cut Mine operate under a separate enterprise agreement which will expire in March 2022. The Wambo Open Cut enterprise agreement and employees transferred to Glencore on December 1, 2020 as part of the new Joint Venture. Employees of the Company's Wambo Underground Mine operate under a separate labor agreement. That agreement will expire in March 2021. The Wambo coal handling and preparation plant hourly employees are under a separate labor agreement that expires in December 2021. Hourly employees of these mines comprise approximately 8% of the Company’s Australian subsidiaries’ hourly employees, who generated approximately 23% of the Company’s Australian production during the year ended December 31, 2020. (7) Employees of the Company’s Coppabella Mine operate under a separate enterprise agreement which expires in June 2021. Hourly employees of this mine comprise approximately 23% of the Company’s Australian subsidiaries’ hourly employees, who generated approximately 9% of the Company’s Australian production during the year ended December 31, 2020.

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