The Rhyolite Ridge lithium-boron mine project site is seen, on Thursday, Feb. 22, 2024, in Esmeralda County, Nevada. Rhyolite Ridge holds the largest known lithium and boron deposit in North America.

Charlotte-based Blue Sphere has signed a contract worth an estimated $65.7 million for the purchase of “green gas” from a proposed biogas plant in the Netherlands.

Lithium, much of which is mined outside the United States, serves as a crucial component in electric vehicle batteries and other green technologies. Rhyolite Ridge is expected to produce enough ...