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Exploration Contracts - Exploration and evaluation expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Schedule Of Break Down Of Exploration Expenses [Line Items]        
Environmental Studies $ 15,360 $ 18,570 $ 20,534 $ 44,004
Exploration Labor 1,030 819 3,374 2,397
Mining, Technological and Process Development 242 694 813 1,658
PMTS 3,685 26 6,458 48
Share-based compensation 1,587 3,032 7,399 30,577
Sponsorship, Training and Stakeholder Engagement 455 499 1,116 802
Other 304 208 646 695
Exploration and evaluation expenses 22,663 23,848 40,340 80,181
NORI Exploration Contract        
Schedule Of Break Down Of Exploration Expenses [Line Items]        
Environmental Studies 15,360 14,871 20,526 35,331
Exploration Labor 700 435 2,308 1,286
Mining, Technological and Process Development 214 429 704 960
PMTS 3,226 15 5,461 32
Share-based compensation 1,122 1,578 5,142 16,680
Sponsorship, Training and Stakeholder Engagement 300 428 654 563
Other 278 194 573 587
Exploration and evaluation expenses 21,200 17,950 35,368 55,439
Marawa Option Agreement        
Schedule Of Break Down Of Exploration Expenses [Line Items]        
Environmental Studies   1,852 8 4,341
Exploration Labor 167 199 541 555
Mining, Technological and Process Development 16 185 57 402
PMTS 229 7 499 9
Share-based compensation 231 594 1,123 6,925
Sponsorship, Training and Stakeholder Engagement 62 6 148 73
Other 11 14 16 70
Exploration and evaluation expenses 716 2,857 2,392 12,375
TOML Exploration Contract        
Schedule Of Break Down Of Exploration Expenses [Line Items]        
Environmental Studies   1,847   4,332
Exploration Labor 163 185 525 556
Mining, Technological and Process Development 12 80 52 296
PMTS 230 4 498 7
Share-based compensation 234 860 1,134 6,972
Sponsorship, Training and Stakeholder Engagement 93 65 314 166
Other 15   57 38
Exploration and evaluation expenses $ 747 $ 3,041 $ 2,580 $ 12,367