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Asset retirement obligations (Tables)
 12 Months Ended
Dec. 31, 2021
Disclosure of Asset Retirement Obligations [abstract]  
Summary of asset retirement obligations
TurkeyCanadaGreeceRomaniaBrazilTotal
At January 1, 2021$44,816 $12,961 $51,940 $1,661 $— $111,378 
Acquired during the year— 3,300 — — — 3,300 
Accretion during the year608 131 649 24 — 1,412 
Revisions to estimate10,209 (554)220 11,803 — 21,678 
Settlements(1,039)— (1,274)— — (2,313)
At December 31, 2021$54,594 $15,838 $51,535 $13,488 $— $135,455 
Less: Current portion— — (4,088)— — (4,088)
Long term portion$54,594 $15,838 $47,447 $13,488 $— $131,367 
Estimated undiscounted amount$71,404 $18,416 $68,704 $19,062 $— $177,586 

TurkeyCanadaGreeceRomania
Brazil(1)
Total
At January 1, 2020$39,196 $12,638 $42,650 $1,533 $— $96,017 
Accretion during the year753 243 863 34 52 1,945 
Revisions to estimate 5,539 80 10,056 94 — 15,769 
Settlements(672)— (1,629)— — (2,301)
Disposal— — — — (52)(52)
At December 31, 2020$44,816 $12,961 $51,940 $1,661 $— $111,378 
Less: Current portion— — (4,701)— — (4,701)
Long term portion$44,816 $12,961 $47,239 $1,661 $— $106,677 
Estimated undiscounted amount$56,752 $14,218 $65,564 $2,153 $— $138,687 

(1) The Vila Nova iron ore mine was sold in 2020 and has been presented with discontinued operations (see Note 7).
Summary of present value of estimated future net cash outflows
The provision is calculated as the present value of estimated future net cash outflows based on the following key assumptions:
TurkeyCanadaGreeceRomania
%%%%
At December 31, 2021
Inflation rate
1.3 to 1.9
1.5
0.7 to 1.9
1.9
Discount rate
1.3 to 1.9
1.5
0.7 to 1.9
1.9
At December 31, 2020
Inflation rate
0.7 to 1.5
0.9
0.4 to 1.7
1.5
Discount rate
0.7 to 1.5
0.9
0.4 to 1.7
1.5