The firm, part of billionaire Anil Agarwal-led Vedanta Ltd, had clocked a net profit of Rs 1,940.14 crore in the year-ago period, it said in a regulatory filing.
Total income of the company also took a hit and fell by 30 per cent to Rs 2,530.61 crore in April-June this fiscal from Rs 3,630.17 crore during the same period in 2015-16.
On the decline in revenues, HZL said it was on account of lower volumes, primarily zinc, and lower LME (London metals Exchange) partly offset by higher rupee depreciation and higher silver price.
Zinc metal's cost of production per tonne before royalty (COP) during the quarter increased Rs 62,138 (USD 928) in line with production plan of lower volumes from Rampura Agucha open cast mine in the June quarter and thus lower average grades.
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This was partly offset by lower coal and commodity prices, cost optimisation projects in procurement and the commercial and higher by-product credits, it said.
On lower profits, it said: "The above revenue and cost of production resulted in a 33 per cent y-o-y decline in EBITDA during the quarter to Rs 1,130 Crore and 13 per cent decline from previous quarter.
HZL Chairman Agnivesh Agarwal said: "In line with strong zinc fundamentals and our expectations, zinc prices surged 14 per cent in Q1 2016-17 as compared to the previous quarter, making it the best performing base metal."
The firm also witnessed a rally in silver prices, which along with increasing volumes is accentuating its contribution in the profits, having reached almost 20 per cent at present, he added.
Ore production from Sindesar Khurd declined and reached the originally conceived capacity of 3.75 million tonnes per annum (MTPA) and production from Rampura Agucha underground mine crossed one MTPA production rate during the quarter.
HZL's net cash and cash equivalents are at Rs 23,349
crore as on June 30, 2016, after an outflow of Rs 12,205 crore due to the special golden jubilee dividend including dividend distribution tax in April 2016.
Rampura Agucha and Sindesar Khurd mines were awarded the prestigious Five Star rating recently initiated by Ministry of Mines for the efforts and initiatives taken for implementation of the Sustainable Development Framework and for exemplary compliances as well as best practices, it added.
The company continued with high pace of mine development, achieving 14,011 metres of total mine development during the quarter, up 18 per cent from a year ago, HZL said.
Progress of the new 1.5 MTPA capacity mill and power upgradation projects are in full pace and in line with commissioning by end of the financial year (2016-17).
Zawar mill debottlenecking along with associated power and infrastructure projects are progressing well, while Kayad mine project is near completion having achieved its eventual capacity of 1 MTPA, it said.