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Zinc comes from natural mineral deposits of ore in the earth s crust. The deposits may be close to the surface, in which case they will be mined from an open pit. Alternatively, they may be some distance underground and cannot be mined directly from the surface.
Plants have always been a main source of minerals for humans. When you eat raw spinach, for example, it contains tiny amounts of iron, calcium, magnesium, zinc, copper, and selenium (source). But... the zinc found in spinach is drastically different than zinc mined from the earth or found in sea water. When the spinach plant absorbs the zinc from the soil, it changes the molecular structure of this rock. By adding a few molecules, the zinc goes from a ionic compound to a covalent compound.