The incident took place at Shambhupura area when the dumper carrying clay hit the bike of 25-year-old Indu, they said.
Following the incident, locals set ablaze two dumpers, belonging to a mine owner. In retaliation, mine workers burnt three two-wheelers and damaged a shop, police said.
Someone from the mob also opened fire but none was injured, Chittorgarh SP Raghvendra Suhasa claimed.
Twelve people have been detained so far in this connection, he said.