A tin concentrator treats a feed containing $1\%$ tin, to obtain $42\%$ concentrate grade and recovery of $72\%.$ Assuming that the tin is totally contained in the mineral cassiterite $($SnO$2),$ calculate i$.\%$ metal $($i$.$e$.$ tin$)$ content present in the mineral cassiterite $($SnO$2)$ ii$.$ iii. iv$.$ v$.$ vi$.$ vii. Weight of concentrate produced from $1$ tonne of ore? Separation efficiency? Smelter payment for tin? $($Assume tin price to be $$8500/$ton$)$ Smelter treatment charge? $($Given treatment charge is $$385/$ton of ore$)$ Cost of transportation to the smelter? $($Given transport charge is $$20/$ton$)$ Net Smelter Return for processing $1$ tonne of concentrator feed