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Adoption of new accounting standards (Tables)
12 Months Ended
Dec. 31, 2019
Disclosure of Significant Accounting Policies [Abstract]  
Disclosure of impact of transition on new accounting standards
The impact on transition is summarized below.
 
December 31, 2018

 
IFRS 16 Adjustment

 
January 1, 2019

 
 
 
 
 
 
Lease assets presented in property, plant and equipment
$
11,345

 
$
9,379

 
$
20,724

Lease liabilities – current
2,978

 
2,658

 
5,636

Lease liabilities – non-current
6,538

 
6,168

 
12,706

Accounts receivable and other
80,987

 
(553
)
 
80,434

Reconciliation of lease commitments previously reported and lease liability recognized
A reconciliation of lease commitments previously reported and the amount of the lease liability recognized is as follows:
 
January 1, 2019

 
 
Operating lease commitments at December 31, 2018
$
64,690

Exclusion of arrangements to explore for or use minerals
(53,186
)
Leases with low value at January 1, 2019
(1,677
)
Leases with less than 12 months of remaining lease term at January 1, 2019
(866
)
Arrangements reassessed as leases
3,120

Effect of discounting using the incremental borrowing rate at January 1, 2019
(3,255
)
Lease liabilities recognized as IFRS 16 adjustment at January 1, 2019
$
8,826