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Investments Accounted for Using the Equity Method - Summary of Ownership Interest in Equity Accounted Investments (Detail) | 12 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Disclosure of significant investments in associates and joint ventures [line items] |  |
Reporting date | --06-30 |
Samarco Mineracao S.A. [member] |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |
Country of incorporation | Brazil |
Principal place of business | Brazil |
Principal activity | Iron ore mining |
Reporting date | --12-31 |
Ownership interest | 50.00% | 50.00%
Carbones del Cerrejon LLC [member] |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |
Country of incorporation | Anguilla |
Principal place of business | Colombia/Ireland |
Principal activity | Coal mining in Colombia |
Reporting date | --12-31 |
Ownership interest | 33.33% | 33.33%
Compania Minera Antamina S.A. [member] |  |
Disclosure of significant investments in associates and joint ventures [line items] |  |
Country of incorporation | Peru |
Principal place of business | Peru |
Principal activity | Copper and zinc mining |
Reporting date | --12-31 |
Ownership interest | 33.75% | 33.75%

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- Definition The country in which a joint venture of the entity is incorporated. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 16 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_16_b_ii&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_17_b_ii&doctype=Standard -URIDate 2019-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2019-01-01 -Paragraph 21 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_21_a_iii&doctype=Standard -URIDate 2019-03-27 + Details
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