At divergent ocean plate boundaries, the correct process for the formation of mineral deposits is:
Metals dissolve in superheated water, forming minerals when the water cools.
At these boundaries, tectonic plates move apart, allowing magma from the mantle to rise and create new oceanic crust. This process can generate hydrothermal activity, where superheated water, rich in dissolved metals and minerals, escapes from the seafloor. As the water cools, the minerals precipitate out and can form mineral deposits.