House Natural Resources hearing reveals sharp split over deep-sea mining's risks and potential

House Republicans and industry witnesses urged fast action to tap seabed minerals for batteries and national security, while Democrats, environmental groups and scientists warned that deep‑sea mining is expensive, unproven and could cause lasting ecological and legal damage.

At a House Committee on Natural Resources subcommittee hearing on deep‑sea mining, Republican members highlighted an April executive order intended to accelerate U.S. seabed mineral development and quoted industry estimates for jobs and economic gains. Ranking members and environmental witnesses countered with scientific uncertainty, market volatility, and potential harms to fishery resources, Indigenous communities and the international legal framework that governs the deep ocean.

The debate matters because the minerals cited—nickel, cobalt, copper and manganese—are used in electric‑vehicle batteries and other technologies and are currently concentrated in global supply chains that several witnesses said are dominated by China. Supporters argued the United States can develop domestic and allied processing capacity; opponents said recycling, changing battery chemistries and land‑based sources make seabed mining unnecessary.

"Deep sea mining is a high risk, low reward endeavor," Rep. Darlene Dexter, the subcommittee's ranking member, said in her opening statement, calling industry financial models "based on wildly optimistic assumptions" and…