Please refer the enclosed file.

HZL/2026-27/SECY/71 August 09, 2026 BSE Limited National Stock Exchange of India Limited Phiroze Jeejeebhoy Towers “Exchange Plaza” Plot No C/1, G Block Dalal Street, Fort Bandra Kurla Complex, Bandra (East) Mumbai - 400 001 Mumbai- 400051 Kind Attn: General Manager – Department Kind Attn: Head Listing & Corporate of Corporate Services Communication Scrip Code: 500188 Trading Symbol: HINDZINC Dear Sir/Ma’am Sub: Intimation under Regulations 30 and 30A of Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements) Regulations 2015, as amended from time to time (“LODR”) read with Clause 5A, Para A, Part A, Schedule III of the LODR and relevant SEBI Master Circular This intimation is in reference to the earlier intimation dated January 02, 2026 under Regulations 30 and 30A of LODR. This is to inform you that we, Hindustan Zinc Limited (“HZL”) received an intimation under Regulation 30A of the LODR read with Clause 5A, Para A, Part A, Schedule III of the LODR from Vedanta Resources Limited, Vedanta Holdings Mauritius II Limited, Twin Star Holdings Ltd. and Welter Trading Limited (as related parties of HZL) on August 7, 2026 at 11:31 PM (IST) (“30A Intimation”). The information required to be disclosed by HZL pursuant to its obligations under Regulations 30 and 30A of the LODR read with Clause 5A, Para A, Part A, Schedule III of the LODR, subsequent to the receipt of the 30A Intimation, is enclosed herewith as Annexure A. We request you to kindly take the above information on record. Thanking You Yours faithfully, For Hindustan Zinc Limited Aashhima V Khanna Company Secretary & Compliance Officer ANNEXURE A Disclosure under Regulations 30 and 30A of the LODR read with Clause 5A, Para A, Part A, Schedule III of the LODR and the Master Circular no. HO/49/14/14(7)2025-CFD-POD2/I/3762/2026 issued by SEBI on January 30, 2026 # Particulars Details In case of rescission, amendment or alteration, listed entity shall disclose additional details to the stock exchange(s): i. name and details of the parties to Hindustan Zinc Limited was not a party to the facility the agreement. agreement dated December 30, 2025, for facilities aggregating to an amount of up to USD 80 million (“Facility Agreement”). The following entities were parties to the Facility Agreement: Borrower Vedanta Resources Limited Guarantor Twin Star Holdings Ltd. Vedanta Holdings Mauritius II Limited Welter Trading Limited Agent Bank of Maharashtra IFSC Banking Unit Lenders Bank of Maharashtra GIFT City Branch ii. nature of the agreement Not applicable. Pursuant to the terms of the Facility Agreement, the Borrower and the Guarantors (as member of the promoter group of Vedanta Limited, which is the promoter of Hindustan Zinc Limited) have agreed to ensure that Hindustan Zinc Limited shall not undertake the certain actions / activities unless permitted within the parameters of the Facility Agreement, as disclosed to the stock exchanges under previous disclosure dated January 2, 2026 under Regulation 30 and 30A of Securities and Exchange Board of India (Listing Obligations and Disclosure Requirements 2015, made by HZL to the stock exchanges (“Earlier Disclosure”). This disclosure pertains to rescission of the Facility Agreement, pursuant to repayment of the facilities # Particulars Details under the Facility Agreement. Accordingly, all restrictions on Hindustan Zinc Limited as disclosed under the Earlier Disclosure stands released. iii. date of execution of the agreement Not applicable. Pursuant to the terms of the Facility Agreement, the Borrower and the Guarantors (as member of the promoter group of Vedanta Limited, which is the promoter of Hindustan Zinc Limited) have agreed to ensure that Hindustan Zinc Limited shall not undertake the certain actions / activities unless permitted within the parameters of the Facility Agreement, as disclosed to the stock exchanges under the Earlier Disclosure. This disclosure pertains to rescission of the Facility Agreement, pursuant to repayment of the facilities under the Facility Agreement. Accordingly, all restrictions on Hindustan Zinc Limited as disclosed under the Earlier Disclosure stands released. iv. details and reasons for amendment Not applicable. o r alteration and impact thereof (including impact on management or control and on the restriction or liability quantified earlier); v. reasons for rescission and impact Pursuant to the terms of the Facility Agreement, the t hereof (including impact on Borrower and the Guarantors (as member of the management or control and on the promoter group of Vedanta Limited, which is the restriction or liability quantified promoter of Hindustan Zinc Limited) have agreed to earlier) ensure that Hindustan Zinc Limited shall not undertake the certain actions / activities unless permitted within the parameters of the Facility Agreement, as disclosed to the stock exchanges under the Earlier Disclosure. This disclosure pertains to rescission of the Facility Agreement, pursuant to repayment of the facilities under the Facility Agreement. Accordingly, all restrictions on Hindustan Zinc Limited as disclosed under the Earlier Disclosure stands released. vi. Explanation for delay in disclosure The delay in filing was due to the time required to complete the requisite process for submission of the disclosure. The Company ensures that it will ensure # Particulars Details timely compliance with the applicable disclosure requirements going forward.