Jhiroli in Almora district is famous for :

Copper mining
Magnesite mining
Gypsum mining
Graphite mining

The correct answer is (b), Magnesite mining.

Jhiroli is a town in the Almora district of Uttarakhand, India. It is famous for its magnesite mines, which are the largest in the country. Magnesite is a mineral that is used in a variety of industries, including the manufacture of ceramics, refractories, and chemicals.

The other options are incorrect. Copper mining is not a major industry in Jhiroli. Gypsum mining is also not a major industry in Jhiroli. Graphite mining is not a major industry in Jhiroli.