India has been exploring ways to secure supplies of lithium, a critical raw material used to make electric vehicle batteries.
Prime Minister Narendra Modi's government last year listed 30 minerals, including lithium, nickel, titanium, vanadium and tungsten, as critical to drive the adoption of clean energy.
"Coal India and some other companies are looking at Argentina," Rao told reporters on the sidelines of an industry conference.
In June Reuters reported that Coal India was exploring lithium blocks in Argentina along with a U.S. company to secure supplies of the battery material as part of India's efforts under the U.S.-led Minerals Security Partnership (MSP).
India, among the world's top greenhouse gas emitters, has been pursuing overseas pacts to secure key minerals in resource-rich countries such as Australia, Argentina and Chile.
India's state-owned firm Khanij Bidesh India Ltd (KABIL) is pursuing leads in Australia for critical minerals, Rao said, adding that KABIL had also secured permission for "non-invasive" exploration in Argentina.
"KABIL has got five blocks and for three blocks, they have permission to do non-invasive exploration," he said.
In January KABIL signed a USD 24 million lithium exploration pact for five blocks in Argentina.
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