Question: Accounting A development section has three headings that are 5.0m*4.5m and have a planned advance per blast of 3m. The rock density is 2.7t/m^3 and

Accounting A development section has three headings that are 5.0m*4.5m and have a planned advance per blast of 3m. The rock density is 2.7t/m^3 and the swell factor is 1.3. The mine utilizes a homogenous fleet of LHDs with a bucket capacity of 6m^3. Each LHD takes on average 45 seconds to load, 7 minutes to travel to the dipping point, 15 seconds to dump at the tip, and 3:15 minutes to return to the face. The LHD has an average availability and utilization (inclusive of all efficiencies) of 90% and 65% respectively. you may assume an LHD bucket fill factor of 88%.

(1) Determine the total cleaning time

(2) Determine the hourly production rate If the mine works two 8 hour shifts per day ( one blasting and one cleaning) and 22 days per month on average,

3) determine how many LHDs are required per section if you plan to blast all the headings per day. Assume the headings are equidistant from the tipping point

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