Norway's oil and gas reserves have made it one of the world's wealthiest countries but its dreams for deep-sea discovery now center on something different.

This time, Oslo is looking for a leading role in mining copper, zinc and other metals found on the seabed and in hot demand in green technologies.

Norway could license companies for deep-sea mining as early as 2023, its oil and energy ministry said, potentially placing it among the first countries to harvest seabed metals for electric vehicle batteries, wind turbines and solar farms.