Mining Methods and Machinery · Mining Methods · 2 marks · Numerical answer
The cut-and-fill stope dimensions are shown. Pillars are4×4 m, separated by clear13 m intervals along the stope. Ore density is2.5 tonne/m³ and slices span the full width. Find first-slice recovered ore in thousands of tonnes, to one decimal.
The first slice has length255 m,width6 m and height4.8 m. Pillar pitch is13+4=17 m, giving15 pillars over255 m. Net plan area is255×6−15×4×4=1290 m². Slice volume is1290×4.8=6192 m³, and recovered mass=6192×2.5=15480 tonnes=15.48×10³ tonnes. Rounded result is15.5.
More Mining Methods questions
GATE 2026 MN Q61– A bord-and-pillar panel has24 pillars of40×40 m centre-to-centre spacing,4 m galleries…
GATE 2025 MN Q12– A steeply dipping metalliferous deposit is not susceptible to spontaneous heating. Broken…
GATE 2025 MN Q33– A bord-and-pillar panel has8 blasting rounds per shift, face4.2×2.5 m, average pull1.2 m,…
GATE 2025 MN Q34– In-situ coal density is1320 kg/m³ and blasted coal density952 kg/m³. Find the swell factor…
