Section 30(1)(i) in Rajasthan Minor Mineral Concession Rules, 2017
(i)a whole-time Mining Engineer or a person possessing first class mine manager's certificate of competency issued by the Director General of Mines Safety and geologist, where mining operations are carried out by deployment of heavy mining machinery for deep hole drilling, excavation, loading and transport, or where the average employment exceeds one hundred and fifty per day;