GM (GM) is upping the ante on its EV bet, investing $625 million directly into a US-based lithium mine project. GM and miner Lithium Americas (LAC) announced the two companies will create a joint venture to develop and mine a site known as “Thacker Pass” in Humboldt County,

General Motors has agreed to establish a joint venture with Lithium Americas Corp. that includes the automaker supplying $625 million in cash and credit to the Canadian mining business, the companies announced Wednesday.

GM is aiming to source more of its raw materials for electric vehicles from the U.S, to manage battery cell costs and decrease its reliance on imported materials.

The automaker has invested in and partnered with companies along the EV battery supply chain, from raw materials to recycling, as it works to secure a supply chain for its electric vehicles.