Assume a gold deposit of one million ton of ore reserves at average grade 2.6 g/t, gold price $1900/ounce, mining cost 55$/t and processing cost 24 $/t, gold recovery rate is 85%. What is the breakeven cut-off grade? If the dilution rate of mining is 10% and the average grade of the waste rock is 0.3 g/t, what is the breakeven cut-off grade? At the end of mine life, how much of the ore reserves is recovered? How much ore is produced (including both ore and waste mined)