Explanation:

Indian coal reserves are of Gondwana and tertiary period and are poor in quality and of no-coking grade i.e. coke cannot be formed from it due to high ash and sulphur content in it.
Monazite sands are a rich source of Thorium and some other rare earth minerals. Coasts of Kerala are world’s richest reserves of Monazite in world followed by coastal sands of Madagascar and South Africa. It often occurs as placer deposits.