Arca works with metals and minerals producers to transform mining waste into large-scale carbon sinks, for gigatonne-scale impact with an ultralight footprint. This breakthrough technology was recognized with a $1m XPRIZE from the Elon Musk Foundation. Arca helps mining companies measure, maximize and monetize the carbon mineralization potential of their mine tailings. Arca recently announced a massive offtake agreement with Microsoft to delivery nearly 300,000 tonnes of durable carbon dioxide removal over 10 years.