The Enforcement Directorate (ED) which has been on a spree conducting searches at the sand mining quarries in Tamil Nadu, on Monday made shocking revelations, in the Madras High Court, with regard to financial irregularities. The ED informed the court that the total sale value of the illegal excess sand mined in the past one to two years was Rs 4,730 crore as against the recovered revenue of merely Rs 36.45 crore