Please refer the enclosed file

HZL/2026-27/SECY/87 October 03, 2026 BSE Limited National Stock Exchange of India Limited Phiroze Jeejeebhoy Towers Exchange Plaza, 5th Floor Plot No., C/l, G Block Dalal Street, Fort Bandra-Kurla Complex, Bandra (East), Mumbai – 400 001 Mumbai – 400 051 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: Production Release for the second quarter and half year ended September 30, 2026 Pursuant to Regulation 30 of SEBI (Listing Obligations and Disclosure Requirements) Regulations, 2015, and with reference to captioned subject, please find enclosed herewith Production release for the second quarter and half year ended September 30, 2026. Kindly take the above information on record. Thanking you. Yours faithfully, For Hindustan Zinc Limited Aashhima V Khanna Company Secretary & Compliance Officer Enclosed: as above Sensitivity: Public (C4) Hindustan Zinc Limited, the World's Largest Integrated Zinc Producer, announces Production release for the Second Quarter and Half Year ended September 30, 2026 Udaipur, October 3, 2026: Hindustan Zinc Limited today announced its production numbers for the second quarter ended September 30, 2026. “Record second quarter and first half refined metal production” 2Q 1Q 1H Particulars % % % (In ‘000 tonnes, or as stated’) FY27 FY26 FY27 FY27 FY26 Change Change Change Mined Metal 271 258 5% 268 1% 539 523 3% Saleable Metal 264 246 7% 260 1% 524 496 6% - Refined Zinc1 212 202 5% 213 -0.4% 426 403 6% - Refined Lead 51 45 14% 47 9% 99 93 6% Silver (in tonnes) 173 144 20% 149 16% 321 293 10% Silver (in million ounces) 5.6 4.6 20% 4.8 16% 10 9.4 10% Wind Power (in million units) 155 132 17% 133 17% 288 266 8% 1. Includes 5kt, 2.5kt, 3.3kt, 8.3kt and 7.5kt from Hindustan Zinc Alloys (100% subsidiary of HZL) in 2QFY27, 2QFY26, 1QFY27, 1HFY27 and 1HFY26 respectively. 2QFY27  Record second quarter mined metal production at 271 kt, up 5% YoY, driven by higher ore production.  Refined metal production at 264 kt, up 7% YoY, driven by additional capacity unlocked from debottlenecking projects at Chanderiya & Dariba and 160 ktpa roaster at Debari and in line with plant availability.  Saleable silver production at 173 metric tonnes, up 20% YoY, in line with production plan.  Wind power generation at 155 MU, up 17% YoY, in line with wind velocity & weather patterns. 1HFY27  Continued operational excellence with record first-half mined metal production for the sixth consecutive year at 539 kt, up 3% YoY.  Highest ever first half refined metal production at 524 kt, up 6% YoY.  Silver production at 321 metric tonnes, up 10% YoY.  Wind power generation at 288 MU, up 8% YoY. For further information, please contact: Raksha Jain Director - Investor Relations raksha.jain@vedanta.co.in Maitreyee Sankhla Head Corporate Communications maitreyee.sankhla@vedanta.co.in About Hindustan Zinc Hindustan Zinc Limited (BSE: 500188 and NSE: HINDZINC), a Vedanta Group company, is the world’s largest integrated zinc producer and is amongst the top 10 silver producers globally. The company supplies to more than 30 countries and holds a market share of about 74% of the primary zinc market in India. Hindustan Zinc has been recognized as the world’s most sustainable company in the metals and mining category for the third consecutive year by the S&P Global Corporate Sustainability Assessment 2025, reflecting its operational excellence, innovation, and leading ESG practices. The company also became the first Indian company to join the prestigious International Council on Mining & Metals (ICMM) in 2025. The company also launched EcoZen, Asia’s first low carbon ‘green’ zinc brand, produced using renewable energy. Hindustan Zinc is also a certified 3.32 times Water- Positive company and is committed to achieving Net Zero emissions by 2050 or sooner. The company is also transforming the lives of 2.6 million people through its focused social welfare initiatives. As an energy transition metals company, Hindustan Zinc is pivotal in the journey of sourcing critical metals essential for a sustainable future. Learn more about Hindustan Zinc on - https://www.hzlindia.com/home/ and follow us on LinkedIn, Twitter, Facebook, and Instagram for more updates. Disclaimer This press release contains “forward-looking statements” – that is, statements related to future, not past, events. In this context, forward-looking statements often address our expected future businesses and financial performance, and often contain words such as “expects,” “anticipates,” “intends,” “plans,” “believes,” “seeks,” “should” or “will.” Forward–looking statements by their nature address matters that are, to different degrees, uncertain. For us, uncertainties arise from the behaviour of financial and metals markets including the London Metal Exchange, London Bullion Metal Association, fluctuations in interest and/or exchange rates and metal prices; from future integration of acquired businesses; and from numerous other matters of national, regional and global scale, including those of a political, economic, business, competitive or regulatory nature. These uncertainties may cause our actual future results and/or business operations to be materially different than those expressed in our forward-looking statements. We do not undertake to update our forward-looking statements and investors should take their own decisions.