The leading zinc producer is also expanding metal production capacity to 1.2 million tonnes (MT) by 2019-20 from around 1 million ton at present.
The company plans to convert its Rampur Agucha block, which contributes 75 per cent of its output, to under-ground mine by shutting all open cast operations.
"HZL is on its way towards transition to a fully underground mining company with next generation of technology. This transition will be completed either by the end of current financial year or maximum by early next year," Hindustan Zinc CEO Sunil Duggal told PTI.
"But since we are ramping up all other mines, we are well placed to meet the requirements of our smelters and also our production levels. Gradually the production level at Rampura Agucha under-ground mine will pick-up and will further support our expansion plans," he said.
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Duggal said the company has already expedited expansion at other mines to ensure that the overall mine production is not impacted.
The country's largest integrated zinc producer will be expanding all its mines by 2019-20 to meet the growing demand.
The company said the production at Rajpura Dariba mine is being expanded to 1.5 million ton from the current capacity of 0.9 million ton.
The silver rich Sindesar Khurd mine is being expanded from the current capacity of 4 million ton to 6 million ton.
Zawar mine is all set to reach the capacity of 2.5 million ton from 1.8 million ton in current financial year and subsequently to 4.5 million ton in the next three years.
The company's Kayad mine in Ajmer has ore production capacity of 1 million ton and efforts are being made to expand this mine as well.
Since disinvestment in 2002, Hindustan Zinc has invested over USD 3 billion in four phases of expansion programmes to reach zinc production capacity of 1 million ton and within three years, the company is expected to expand the metal production capacity to 1.2 million tonne, he said.