Polymetallic nodules contain four metals (nickel, cobalt, copper, manganese). The TAM for the four metals in 2023 was $393B per year. The market is growing at a compound annual growth rate (CAGR) of over 7%. External references:
Copper (Cu): Spherical Insights 2024
Nickel (Ni): Fortune Business Insights 2024
Manganese (Mn): Sky Quest 2024
Cobalt (Co): Statista 2024