(Solved): 2. A longwall coal mining operation mines 70 linear feet of panel per day. Assuming that extractio ...

2. A longwall coal mining operation mines 70 linear feet of panel per day. Assuming that extraction thickness is \( 7 \mathrm{feet} \), and that panel width is \( 1200 \mathrm{ft} \), determine the throughput in tons/d. Assume that the specific gravity for coal is \( 1.3 . \) 3. For problems 1 and 2 assume that the extracted thickness consists of 6 feet of coal and 1 foot of waste rock (due to partings) with \( S G=2.3 \). Calculate the new throughput for both problems 2 and 3 .