Sigma Lithium Corp. soared in Canadian trading on news that Tesla Inc. has been weighing a takeover of the battery-metals miner amid rampant demand for the materials needed to power electric vehicles.

Tesla, the EV maker run by Elon Musk, has been speaking with potential advisers about a bid for Sigma Lithium, Bloomberg News reported. Sigma Lithium is one of multiple mining options Tesla is exploring as it mulls its own refining, a person with knowledge of the matter said, asking not to be identified discussing confidential information. 

Sigma Lithium’s biggest shareholder has been exploring a potential sale of the company and gauging interest from miners and carmakers, people familiar with the matter said. Its biggest investor, holding 46 percent, is A10 Investimentos, a Brazilian private equity fund that Sigma co-chief executive officer Ana Cabral-Gardner helped establish. Co-CEO Calvyn Gardner also owns part of the miner.

Deliberations are in the early stages and may not lead to a transaction, according to the people. Potential suitors may hesitate to bid after shares tripled in the last 12 months and on high price expectations by the owners, the people said. Sigma’s owners could also wait to develop the company’s main project further before seeking an exit, according to the people.

Elon Musk and representatives for Tesla did not respond to requests for comment. Sigma Lithium’s Cabral-Gardner declined to comment on “rumors.”

The company is developing a large lithium rock deposit in Brazil known as Grota do Cirilo. The company said that it’s considering nearly tripling lithium production at the project in 2024 after a survey revealed mineral reserves 63 percent higher than previously thought.

Sigma Lithium’s shares have been rising along with surging lithium prices. Demand for the silvery white metal, which is key to making EV batteries, is greatly outstripping supply amid the push to electrify transportation in a shift away from fossil fuels.

Sigma Lithium may also attract interest from large miners as well as customers of the metal. Rio Tinto Group, the world’s second-biggest mining company, is actively looking for lithium acquisitions, but isn’t currently interested in Sigma Lithium because of the high asking price, one of the people said.

The company has already signed supply deals with LG Energy Solution and Japanese trading house Mitsui & Co.