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Mining Engineering Drilling And Blasting Difficulty: Medium

In cat II and III degree gassy mine, major consideration to decide the quantity of air going u/g is the rate of emission of gas, should be diluted by ventilating air, that is percentage not more than . . . . . . . . in the main return air way of mine. The mechanical mixture of gases existing in a mine given off after explosion called Personal dust samples are suitable for Electronic anemometers measure air velocities in . . . . . . . . ranges. Four alternative investment opportunities are available in a mining project each offering different revenues for the next two years as shown in the table. If the interest rate is 10% annually, which alternative provides the best investment opportunity based on the net present value? Case I Case II Case III Case IV Initial Investment (Rs.) 40,000 1,00,000 80,000 1,20,000 Return in Year 2 30,000 75,000 65,000 80,000 Return in Year 3 30,000 75,000 65,000 80,000