OFFICIAL ● Increasing stope length from 50 m to 80 m raises RCF values in both center and barrier pillar drifts, but they still remain in an acceptable range. ● The 80 m option improves development efficiency and extends the mining period per stope level by ~5 years, positively affecting scheduling and capital deployment. Figure 3 – Annual production profiles for 50 m and 80 m stope-length layouts (single stope level), illustrating the need for multi-level/parallel operation. Figure 4 – RCF value chart after Jager und Ryder (1999) for the tunnel conditions of drifts; dashed lines represent the values for 50 m-long stopes and solid lines represents the values for 80 m-long stopes. Red lines represent drifts in the barrier pillars and black lines represent drifts in the center pillar.
RkJQdWJsaXNoZXIy MTM0Mzk2