21. The most common system of stope extraction is to maintain as . . . . . . . . A. Diagonal line of extraction B. Horizontal line of extraction C. Vertical line of extraction D. None Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
22. In shrinkage stoping the inclination of stope wall should be . . . . . . . . A. 45° B. >60° C. >75° D. 30° Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
23. Extraction of small sized, irregularly unsystamatic underground working called A. Sub level stoping B. Top slicing C. Block caving D. Gophering Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
24. For a successful VCR stoping, which of the following is appropriate. A. Large dia blast holes B. Spherical explosive charges C. Vertical downward blast hole D. All Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
25. Capacity of slusher is . . . . . . . . tph. A. 30 - 40 B. 40 - 60 C. 10 - 20 D. 70 - 100 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
26. The raise boring consists essentially of drilling a pilot hole of diameter . . . . . . . . A. 0 - 50mm B. 60 - 120mm C. 150 - 200mm D. 230 - 300mm Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
27. The main advantage of drop raising is that number of workers in the lower level are . . . . . . . . except the operator of LHD. A. Zero B. 1 C. 2 D. 4 Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
28. A system of vertical or nearly vertical openings for transfering ore from a stope to a single delivery point. A. Draw point B. Ore pass C. Grizzley D. Finger rise Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
29. In this method needs heavy supports comparative than other methods and also supporting costly. A. Breast B. Shrinkage C. Square set D. Sub level Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
30. The method used for mining narrow veins or pay streaks, where ore occurs as a distinct band, can be separated easily from wall rocks, mining known as . . . . . . . . A. Room and pillar B. Wide stall C. Integral caving D. Resuing Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
