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Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2025
Summary of significant accounting policies  
Schedule of estimated useful lives of the assets

Asset

  ​ ​ ​

Useful lives

Buildings and improvements

 

10 to 40 years

Machinery and equipment

 

3 to 20 years

Mine development costs

 

Units-of-production