Assertion: The vast alluvial plain tract of north India is rich in minerals of economic use.
Reasoning: Bulk of the valuable minerals in India are mainly associated with metamorphic and igneous rocks of the peninsular India.

Assertion (A) is not true but Reasoning (R) is correct.

India is endowed with a rich variety of mineral resources due to its varied geological structure. Bulk of the valuable minerals are products of pre-palaezoic age and are mainly associated with metamorphic and igneous rocks of the peninsular India. The vast alluvial plain tract of north India is devoid of minerals of economic use.