The Indian Bureau of Mines shall publish every month, the average sale price of the metal in Indian Rupees in the manner specified below.
(i) In respect of Aluminium, Copper, Lead, Nickel, Tin, and Zinc, the settlement price of London Metal Exchange for the said metals available during all the days of the month shall be multiplied by the reference rate, for the day, of the Reserve Bank of India, for the currency in which the price is obtained.
(ii) In respect of Gold and Silver, the London Bullion Market Association auction price shall be taken.
(iii) Where the Reserve Bank of India reference rate is not available for any day on which the London Metal Exchange / London Bullion Market Association price is available, the Reserve Bank of India reference rate for the immediately preceding day shall be used.
(iv) The simple average for the month of the daily prices of the metal worked out in Indian Rupees as specified above shall be published by the Indian Bureau of Mines as the average sale price of the said metal for that month.