Section 30(1)(ii) in Rajasthan Minor Mineral Concession Rules, 2017
(ii)a whole-time Mining Engineer or the person possessing second class mine manager's certificate of competency issued by the Director General of Mines Safety, 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 seventy five but less than one hundred and fifty per day; and