Prices for the conductive metal, the lightest in the periodic table, have tripled since 2000 in a market now worth $1 billion a year as uses expand in vehicles, ceramics, electronics and lubricants. Apple Inc. and Toyota Motor Corp., maker of the Prius electric-gasoline car, have few alternatives as they pursue higher performance and mobility, leading Dahlman Rose & Co. analysts to forecast lithium demand will double by 2020.

Mario Ruiz / EPA
Demonstrators burn barricades during a protest against foreign lithium exploitation in Santiago, Chile, June 22. Chilean opposition and experts have criticized the Chilean government for its decision to open lithium mining to foreign companies, fearing the government may try to privatize a resource that they regard as state property.