The production jump boosted the unit's revenue by about 90 per cent to $695 million.
Zinc, which is used to galvanise steel to protect it from rusting, is seeing renewed demand due to higher steel production in China.
China's crude steel output is expected to rise further, fuelling greater demand for input metals.
Vedanta said earnings before interest, tax, depreciation and amortisation rose to $777.8 million in the first quarter, from $527.1 million a year earlier.
The company, which also produces iron ore, copper, aluminium and oil, said revenue rose 32 per cent to $3.08 billion in the quarter.
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