Polymetallic Sulphides have been consistent source of which of the following?

1) Gold

2) Copper

3) Lead

4) Aluminium

a. 1, 3, 4

b. 1, 2, 3

c. 2, 4

d. All of the above

ANSWER: 1, 2, 3

Explanation:

Polymetallic Sulphides contain three or more metals/elements.

Polymetallic sulphides have been consistent source of metals like iron, copper, zinc and lead. Apart from these they are also seen as economically viable resources of silver and gold.

It may occur in magmatic, volcanogenic, or hydrothermal environments.

Most sites have been located in mid-ocean at the East Pacific Rise, the Southeast Pacific Rise and the Northeast Pacific Rise. Several deposits are also known at the Mid-Atlantic Ridge but only one has so far been located at the ridge system of the Indian Ocean.