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Asset retirement obligation (Tables)
 12 Months Ended
Dec. 31, 2021
Asset retirement obligation  
Asset Retirement Obligation

 

 

2021

 

 

2020

 

 

2019

 

ARO balance, beginning of the year

 

$22,741

 

 

$21,481

 

 

$26,779

 

Accretion expense

 

 

2,069

 

 

 

2,069

 

 

 

2,068

 

Change in ARO estimates

 

 

(2,473)

 

 

-

 

 

 

-

 

Costs incurred

 

 

-

 

 

 

(809)

 

 

(7,366)

ARO balance, end of the year

 

 

22,337

 

 

 

22,741

 

 

 

21,481