Which one of the following is a non-ferrous metallic mineral resource?

The correct answer is Option (3) → Lead

Metallic minerals are grouped by whether they contain iron or are used mainly in making iron and steel:

• Ferrous — iron ore, manganese, nickel, cobalt (manganese and cobalt are alloyed with iron to make steel)

• Non-ferrous — copper, lead, tin, bauxite, zinc

Lead contains no iron and has no part in steel making; it goes into batteries, cable sheathing and radiation shields, so it is the non-ferrous metal among the options.