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December 27, 2023 Page 6-3 <br />Agapito Associates, Inc. <br /> The SFs of the LW SS2 chute road pillars exceed 4.5. <br />Zone 5 (see Figure 6-5) <br /> The last line of pillars is subjected to a maximum abutment load of between 3,200 and <br />4,000 psi. <br /> The lack of any significant vertical stress imparted onto the life-of-mine roadways. <br /> The SFs of the last line of pillars range between 2.0 and 3.0. <br /> The SFs suggest the remnant pillars in the mains are not load bearing structures. <br /> The SFs of the pillars next to the life-of-mine roadway exceed 1.5. <br /> The SFs of the LW SS1 Headgate pillars exceed 1.5. <br />Zone 6 (see Figure 6-6) <br /> The last line of pillars is subjected to a maximum abutment load of between 3,200 and <br />4,000 psi. <br /> The lack of any significant vertical stress imparted onto the life-of-mine roadways. <br /> The SFs of the last line of pillars range between 3.0 and 3.5. <br /> The SFs suggest the remnant pillars in the mains are not load bearing structures. <br /> The SFs of the pillars next to the life-of-mine roadway exceed 1.5. <br />Zone 7 (see Figure 6-7) <br /> The last line of pillars is subjected to a maximum abutment load of between 1,600 and <br />2,400 psi. <br /> The lack of any significant vertical stress imparted onto the life-of-mine roadways. <br /> The SFs of the last line of pillars all exceed 4.5. <br /> The SFs suggest the remnant pillars in the mains are not load bearing structures. <br /> The SFs of the pillars next to the life-of-mine roadway exceed 3.5. <br />In summary, the modeling indicates that most of the abutment load is constrained to the last line <br />of pillars and the SFs range between 2.0 and 4.5. Following extraction, the remnant pillars in the <br />mains fail and are no longer load bearing structures. The proposed extraction plan isolates the life- <br />of-mine roadway from any significant abutment loads, resulting in neighbouring pillar SFs in <br />excess of 1.5. In essence, the numerical modeling outcomes support the results of the empirical <br />assessment. <br />