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INCOME TAX EXPENSE - Reconciliation of tax rate (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of average effective tax rate and applicable tax rate |  |
Combined statutory income tax rate (as a percent) | 26.50% | 26.50%
Increase (decrease) resulting from: |  |
Mining taxes | 1.70% | 1.20%
Percentage of depletion | (0.90%) | (1.40%)
Difference in foreign tax rates and foreign exchange on deferred income taxes within income tax expense (as a percent) | 5.50% | 4.50%
Change in unrecognized deferred tax assets (as a percent) | (0.40%) | (4.10%)
Over provided in prior periods (as a percent) |  | (0.40%)
Income not subject to tax (as a percent) | (0.70%) | (0.70%)
Effect of non-taxable impairment reversals (as a percent) | (6.90%) | (4.20%)
Accounting expenses disallowed for tax (as a percent) | 1.70% | 2.30%
Taxes on repatriation of foreign earnings (as a percent) | 0.10% | 0.50%
Impact of CARES Act | (1.40%) |
AMT credit receivable due to U.S.Tax Reform (as a percent) |  | (0.50%)
Other (as a percent) | (0.70%) | 1.90%
Effective tax rate (as a percent) | 24.50% | 25.60%

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Tax rate effects, in aggregate, on the reconciliation between the average effective tax rate and the applicable tax rate that the entity does not separately disclose in the reconciliation. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- References No definition available. + Details
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- Definition Tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from adjustments for the current tax of prior periods. [Refer: Average effective tax rate; Applicable tax rate; Adjustments for current tax of prior periods] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the expenses not deductible in determining taxable profit. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the application of foreign tax rates. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from revenue that is exempt from taxation. [Refer: Average effective tax rate; Applicable tax rate] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from alternate minimum tax recovery due to US tax reforms. + References No definition available. + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in unrecognized deferred tax assets. + References No definition available. + Details
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- Definition Tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the mining taxes. + References No definition available. + Details
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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from non-deductible impairment/(reversals). + References No definition available. + Details
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- Definition Tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the CARES Act. + References No definition available. + Details
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- Definition Tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the taxes on repatriation of foreign earnings + References No definition available. + Details
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