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ASSET RETIREMENT OBLIGATION: | 6 Months Ended
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Jun. 30, 2026
ASSET RETIREMENT OBLIGATION: |
ASSET RETIREMENT OBLIGATION: | ​ ​ NOTE 8 — ASSET RETIREMENT OBLIGATION: ​ Peruvian operations: ​ The Company maintains an asset retirement obligation for its mining properties in Peru, as required by the Peruvian Mine Closure Law. In accordance with the requirements of this law, the Company’s closure plans were approved by the Peruvian Ministry of Energy and Mines (“MINEM”). The closure cost recognized for this liability includes the cost, as outlined in its closure plans, of dismantling the Toquepala and Cuajone concentrators, the Ilo smelter and refinery, and the shops and auxiliary facilities at the three units. As part of the closure plans, the Company is required to provide annual guarantees over the estimated life of the mines, based on a present value approach, and to furnish the funds for the asset retirement obligation. This law requires a review of closing plans every five years. ​ Currently, the Company has pledged the value of its Lima office complex for 26% of the guarantee and with a stand-by letter of credit for the other 74% as a security for this obligation. Through January 2026, the Company has provided total guarantees of $110.3 million. ​ On July 20, 2021, the Peruvian Government published Law 31347, which requires companies in the production stage to set aside additional guarantees for progressive closure of its operations. The resources that back these guarantees will be returned to the Company when activities cease and the regulatory agency verifies that all closure measures have been satisfactorily completed. Under this Law, companies must include activities for environmental remediation within the closure schedule and assume costs associated with environmental impacts that are identified during audits. On March 19, 2025, the regulation attached to this Law was published. This new regulation establishes a three-year period to update the guarantee constitution table, including the main components of progressive closure. The Company is initiating the corresponding actions to comply with this new requirement within the established time frame, but does not expect this Law to have a material effect on its financial statements. ​ In December 2025, the Company updated estimates for all of its facilities; the effect was a $5.7 million decrease in the asset retirement obligation and a $2.6 million reduction in the retirement asset; the difference of $3.1 million was recorded as a reduction in cost of goods sold. Additionally, in the first quarter of 2026, the Company updated its estimate for the Toquepala operations; the effect was a $9.2 million increase in the asset retirement obligation and a $6.0 million increase in the retirement asset; the difference of $3.2 million was recorded as an increase in cost of goods sold. ​ Mexican operations: ​ The Company has recognized an estimated asset retirement obligation for its mining properties in Mexico as part of its environmental commitment. Even though there is currently no enacted law, statute, ordinance, written or oral contract requiring the Company to carry out mine closure and environmental remediation activities, the Company believes that a constructive obligation presently exists based on the remediation requirements caused by the closure of any facility. The overall cost recognized for mining closure in Mexico includes the estimated costs of dismantling concentrators, smelter and refinery plants, shops and other facilities. ​ In 2025, the Company adjusted its estimate for the asset retirement obligation for its Mexican operations, mainly due to a detailed review of the closing activities required and an update to life-of-mine plans for the Buenavista operations. The effect of this change was a $106.7 million decrease in the asset retirement obligation and a $48.8 million reduction in the retirement asset; the difference of $57.9 million was recorded as a reduction in cost of goods sold. ​ The following table summarizes the asset retirement obligation activity for the six-month periods ended June 30, 2026 and 2025 (in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2026 | ​ ​ ​ | 2025
Balance as of January 1 | ​ | $ | 471.1 | ​ | $ | 546.1
Changes in estimates | ​ |  | 9.2 | ​ |  | (48.5)
Closure payments | ​ |  | (2.4) | ​ |  | —
Accretion expense | ​ |  | 12.8 | ​ |  | 12.2
Balance as of June 30, | ​ | $ | 490.7 | ​ | $ | 509.9
​

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/410-20/tableOfContent Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 20 -Topic 410 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-2 + Details
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