Hindustan Zinc Limited announced record refined metal production of 264 thousand tonnes for the second quarter ended September 30, 2026, reflecting a 7% year-on-year increase. The company also reported a significant 20% jump in silver production to 173 tonnes, underscoring robust operational efficiency across its mining and smelting operations.

The filing, submitted to stock exchanges on October 3, 2026, highlights that the growth in refined metal output was driven by additional capacity unlocked from debottlenecking projects at Chanderiya and Dariba, alongside the commissioning of a 160 ktpa roaster at Debari. These infrastructure enhancements, combined with consistent plant availability, enabled the company to surpass previous quarterly benchmarks despite market fluctuations.

Production metrics overview

The following table details the key production figures for the second quarter and first half of FY27 compared to the corresponding periods in FY26:

Note: Refined Zinc figures include contributions from Hindustan Zinc Alloys, a wholly owned subsidiary.

Operational drivers and trends

The company’s mined metal production reached 271 kt in Q2FY27, up 5% YoY, primarily driven by higher ore extraction rates. This upstream strength translated into downstream gains, with saleable metal production rising 7% to 264 kt. The refined zinc segment specifically grew 5% to 212 kt, while refined lead saw a notable 14% increase to 51 kt, indicating improved processing efficiency in lead-specific units.

Silver production emerged as a standout performer, climbing 20% YoY to 173 tonnes (5.6 million ounces). This surge aligns with the company’s production plan and contributes significantly to revenue diversification. In the first half of FY27, silver output totaled 321 tonnes, representing a 10% year-on-year growth. Additionally, wind power generation increased 17% YoY to 155 million units in Q2, supported by favorable wind velocity and weather patterns, reinforcing the company’s sustainability credentials.

What the numbers show

A divergence in growth rates between base metals and precious metals highlights the portfolio's resilience. While refined zinc grew 5% and refined lead 14%, silver production expanded 20%. This suggests that silver recovery rates or associated ore grades may have outperformed zinc and lead volumes during the quarter. Furthermore, the 7% growth in saleable metal outpaced the 5% growth in mined metal, implying improved conversion efficiency or inventory utilization from prior periods, as the gap between extracted ore and final saleable product narrowed relative to volume increases.

Hindustan Zinc has seen a significant portion of its equity locked in a non-disposal undertaking following Vedanta Limited’s issuance of unsecured debentures worth ₹2,000 crore. The restriction covers 50.10% of the zinc major’s share capital, effectively preventing Vedanta from selling or pledging this stake until the debt is fully redeemed.

The disclosure was made by Axis Trustee Services Limited, acting as the debenture trustee for the private placement issue executed on September 28, 2026. Under the terms of the Debenture Trust Deed, Vedanta must remain the direct legal and beneficial owner of 50.1% of Hindustan Zinc’s fully diluted share capital and retain control over the subsidiary throughout the life of the debentures.

Regulatory Disclosure Details

The encumbrance was reported under Regulation 31 of the SEBI (Substantial Acquisition of Shares and Takeovers) Regulations, 2011. The filing clarifies that while no new pledge has been created specifically for these debentures, the contractual covenants constitute an 'encumbrance' as defined under Chapter V of the Takeover Regulations. This regulatory classification triggers mandatory disclosure to both BSE and NSE.

Impact on Ownership Structure

The creation of this non-disposal undertaking does not alter the total voting capital or diluted share capital of Hindustan Zinc, which remains at 4,225,319,000 equity shares of ₹2 each. However, it significantly restricts Vedanta’s liquidity options regarding its majority stake. The filing notes that existing encumbrances from prior facilities remain in place, but the current restriction is specific to the new debt instrument.

What the Numbers Show

A critical observation from the disclosure is the overlap between the new non-disposal undertaking and existing encumbrances. The filing states that the post-acquisition holding for encumbrances does not aggregate simply because the current restriction supersedes or overlaps with prior non-disposal undertakings on the same block of shares. Specifically, Vedanta already had 50.10% of shares under non-disposal undertakings from previous facilities. The new deed reinforces this lock-in for the specific ₹2,000 crore debentures, meaning the effective free float available for potential sale remains constrained by the cumulative weight of these covenants rather than just the new issuance.