Interests in Resource Properties (Tables)

12 Months Ended

Dec. 31, 2019

Interests in Resource Properties

Schedule of components of interests in resource properties

	2019		2018
Interest in an iron ore mine	$	216,575	$	218,203
Hydrocarbon development and production assets		36,488		38,040
Exploration and evaluation assets – hydrocarbon probable reserves		12,367		12,367
Exploration and evaluation assets – hydrocarbon undeveloped lands		4,640		4,640
	$	270,070	$	273,250

Schedule of movements in interest in resource properties

The movements in the interest in an iron ore mine and hydrocarbon development and production assets included in non-current assets during the year ended December 31, 2019 were as follows:

	Opening		Decommissioning		Ending
Costs	balance		obligations		balance
Interest in an iron ore mine	$	218,203	$	—	$	218,203
Hydrocarbon development and production assets		45,533		1,167		46,700
	$	263,736	$	1,167	$	264,903

	Opening				Ending
Accumulated depreciation	balance		Additions		balance
Interest in an iron ore mine	$	—	$	1,628	$	1,628
Hydrocarbon development and production assets		7,493		2,719		10,212
		7,493	$	4,347		11,840
Net book value	$	256,243			$	253,063

The movements in the interest in an iron ore mine and hydrocarbon development and production assets included in non-current assets during the year ended December 31, 2018 were as follows:

					Reversal of
	Opening		Decommissioning		impairment		Ending
Costs	balance		obligations		losses		balance
Interest in an iron ore mine	$	30,000	$	—	$	188,203	$	218,203
Hydrocarbon development and production assets		45,871		(338)		—		45,533
	$	75,871	$	(338)	$	188,203	$	263,736

					Reversal of
	Opening				impairment		Ending
Accumulated depreciation	balance		Additions		losses		balance
Interest in an iron ore mine	$	—	$	—	$	—	$	—
Hydrocarbon development and production assets		5,022		2,471		—		7,493
		5,022	$	2,471	$	—		7,493
Net book value	$	70,849					$	256,243

Schedule of movements in exploration and evaluation assets

	2019				2018
	Probable		Undeveloped		Probable		Undeveloped
	reserves		lands		reserves		lands
Balance, beginning of year	$	12,367	$	4,640	$	12,367	$	9,335
Additions		—		—		—		—
Disposal		—		—		—		(4,695)
Balance, end of year	$	12,367	$	4,640	$	12,367	$	4,640