Concept:Khetri is a mining town in Rajasthan known for a metallic mineral.
Explanation:Khetri is located in Jhunjhunu district, Rajasthan.
It is famous for its copper
(Cu) mines.
These mines are owned and operated by Hindustan Copper Limited.
Khetri has been a major copper-producing centre in India.
The Khetri copper belt is historically important for Indian mining.
India's copper reserves are mainly found in Rajasthan, Madhya Pradesh, and Jharkhand.
Rajasthan accounts for a large share of the country's copper reserves.
Malanjkhand in Balaghat district is another important copper mining area.
Therefore, Khetri is associated with copper, not with iron ore, coal, manganese, or bauxite.
Answer:Copper