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AMAK Property and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Line Items]  
AMAK Property and Equipment PLANT, PIPELINE AND EQUIPMENT
Plant, pipeline and equipment include the following at December 31:
20202019
(thousands of dollars)
Platinum catalyst$1,580 $1,580 
Catalyst4,325 4,095 
Land5,428 5,428 
Plant, pipeline and equipment270,149 258,651 
Construction in progress6,422 5,052 
Total plant, pipeline and equipment287,904 274,806 
Less accumulated depreciation(100,800)(85,887)
Net plant, pipeline and equipment$187,104 $188,919 
Plant, pipeline and equipment serve as collateral for our amended and restated loan agreement with a domestic bank (see Note 13).
Interest capitalized for construction for 2020, 2019 and 2018 was approximately nil, nil and $0.7 million, respectively.
Labor capitalized for construction for 2020, 2019 and 2018 was approximately $0.6 million, $0.0 million and $2.3 million, respectively.
Catalyst amortization relating to the platinum catalyst which is included in cost of sales was approximately $1.2 million, $1.3 million and $0.1 million for 2020, 2019 and 2018, respectively.
AMAK  
Property, Plant and Equipment [Line Items]  
AMAK Property and Equipment Property and Equipment
Property and equipment, net consisted of the following at:

September 30,December 31,
20202019
Buildings191,974,662 191,838,962 
Leasehold improvements4,051,062 1,838,317 
Heavy equipment146,801,861 136,066,275 
Motor vehicles22,753,563 22,467,300 
Civil works16,288,221 16,288,221 
Tailings dam23,900,160 23,900,160 
Plant and machinery332,014,825 326,974,958 
Mining assets – rehabilitation costs98,894,826 98,894,826 
Mining assets – underground development costs409,899,633 299,224,519 
Construction in progress3,356,625 4,789,313 
1,249,935,438 1,122,282,851 
Less accumulated depreciation, depletion and amortization(566,920,733)(511,648,419)
683,014,705 610,634,432 
During 2020 and 2019, additions to Mining Assets - underground development costs relates to capital investments in the Guyan mining area.
Property and equipment serve as collateral for the SIDF loan agreement (see Note 10).
Depreciation, depletion and amortization expense related to property and equipment was approximately, SR55,000,000, SR79,000,000 and SR88,000,000 for the nine months ended September 30, 2020 and the years ended December 31, 2019 and 2018, respectively.