Neighboring Chile, the region's top lithium producer, last week unveiled plans for a state-led public-private model, spooking investors.
Bolivia has long maintained strict control over its huge though largely untapped resources, while Mexico nationalized its lithium deposits last year.
The country has six lithium projects under construction and 15 in the advanced exploration or feasibility stage, Mignacco said.
"Argentina's lithium sector has thrived through a decentralized, pro-market strategy," said Benjamin Gedan, director of the Latin America program at The Wilson Center, adding in contrast Bolivia's lithium sector had "repeatedly stalled as a result of excessive state control."
"Chile today produces and exports much more lithium than Argentina," said Natacha Izquierdo, analyst at consultancy ABCEB.