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SEGMENT AND RELATED INFORMATION: - Financial (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) item country segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Financial information related to segments |  |  |
Number of reportable segments | segment | 3 |  |
Number of countries having open-pit operations | country | 2 |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | $ 7,984,900 | $ 7,285,600 | $ 7,096,700
Cost of sales (exclusive of depreciation, amortization and depletion) | 3,929,800 | 3,606,400 | 3,409,000
Selling, general and administrative | 126,200 | 131,800 | 102,600
Depreciation, amortization and depletion | 775,600 | 764,400 | 674,300
Exploration | 32,600 | 30,000 | 29,600
Operating income | 3,120,700 | 2,753,000 | 2,881,200
Interest, net | (347,400) | (319,500) | (261,100)
Other income (expense) | (27,500) | (7,000) | (30,700)
Income taxes | (1,174,400) | (945,300) | (1,053,500)
Equity earnings of affiliate, net of income tax | 6,400 | 10,700 | 12,300
Non-controlling interest | (7,400) | (6,100) | (5,200)
Net income attributable to SCC | 1,570,400 | 1,485,800 | 1,543,000
Capital investment | 592,200 | 707,500 | 1,121,400
Property and mine development, net | 9,458,700 | 9,371,000 | 9,403,800
Total assets | 16,946,500 | 16,407,400 | 14,287,600
Intersegment sales |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | (111,000) | (83,200) | (79,300)
Corporate, other and eliminations |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | (111,000) | (83,200) | (79,300)
Cost of sales (exclusive of depreciation, amortization and depletion) | (124,300) | (89,100) | (88,600)
Selling, general and administrative | 8,600 | 6,800 | 2,100
Depreciation, amortization and depletion | 37,700 | 32,100 | 28,900
Exploration | 12,100 | 2,700 | 3,800
Operating income | (45,100) | (35,700) | (25,500)
Capital investment | 8,000 | 6,800 | 20,600
Property and mine development, net | 704,900 | 346,200 | 374,500
Total assets | $ 3,573,300 | 2,470,000 | 379,100
Mexican Open-pit |  |  |
Financial information related to segments |  |  |
Number of open-pit copper mines | item | 2 |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | $ 4,412,400 | 3,963,900 | 4,075,900
Mexican Open-pit | Operating segment |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | 4,412,400 | 3,963,900 | 4,075,900
Cost of sales (exclusive of depreciation, amortization and depletion) | 1,991,600 | 1,613,100 | 1,611,000
Selling, general and administrative | 70,500 | 78,600 | 55,300
Depreciation, amortization and depletion | 366,700 | 351,900 | 360,400
Exploration | 2,500 | 1,800 | 2,000
Operating income | 1,981,100 | 1,918,500 | 2,047,200
Capital investment | 317,100 | 244,300 | 266,800
Property and mine development, net | 4,470,500 | 4,648,500 | 4,783,800
Total assets | 7,236,100 | 8,081,900 | 8,165,200
Mexican Open-pit | Reportable subsegments | Operating segment |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | $ 4,412,400 | 3,963,900 | 4,075,900
Mexican IMMSA Unit |  |  |
Financial information related to segments |  |  |
Number of underground poly metal mines | item | 5 |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | $ 529,900 | 464,800 | 527,900
Mexican IMMSA Unit | Operating segment |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | 529,900 | 464,800 | 527,900
Cost of sales (exclusive of depreciation, amortization and depletion) | 383,000 | 380,300 | 377,200
Selling, general and administrative | 9,500 | 7,900 | 8,500
Depreciation, amortization and depletion | 42,500 | 52,300 | 47,600
Exploration | 8,600 | 9,000 | 5,300
Operating income | 86,300 | 15,300 | 89,300
Capital investment | 72,100 | 106,300 | 60,000
Property and mine development, net | 548,200 | 497,100 | 448,300
Total assets | 967,200 | 837,600 | 930,200
Mexican IMMSA Unit | Reportable subsegments | Operating segment |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | 418,900 | 381,600 | 448,600
Mexican IMMSA Unit | Intersegment sales | Operating segment |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | $ 111,000 | 83,200 | 79,300
Peruvian Operations |  |  |
Financial information related to segments |  |  |
Number of open-pit copper mines | item | 2 |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | $ 3,153,600 | 2,940,100 | 2,572,200
Peruvian Operations | Operating segment |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | 3,153,600 | 2,940,100 | 2,572,200
Cost of sales (exclusive of depreciation, amortization and depletion) | 1,679,500 | 1,702,100 | 1,509,400
Selling, general and administrative | 37,600 | 38,500 | 36,700
Depreciation, amortization and depletion | 328,700 | 328,100 | 237,400
Exploration | 9,400 | 16,500 | 18,500
Operating income | 1,098,400 | 854,900 | 770,200
Capital investment | 195,000 | 350,100 | 774,000
Property and mine development, net | 3,735,100 | 3,879,200 | 3,797,200
Total assets | 5,169,900 | 5,017,900 | 4,813,100
Peruvian Operations | Reportable subsegments | Operating segment |  |  |
Financial information relating to segments |  |  |
Net sales (including sales to related parties, see note 17) | $ 3,153,600 | $ 2,940,100 | $ 2,572,200

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- Definition Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 23 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447 + Details
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