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1 <br />' to the entry and belt portals. Debris did, however, remain well <br />clear of all portal openings. <br />1 <br />The second area involved sliding immediately above the existing <br />fan portal. Slide mechanisms in this area involved both shallow <br />' surficial slumping and the development of a small flow slide <br />immediately east of the fan portal. These slides brought <br />material down against the existing fan house and destroyed <br /> exposed portions of the fan. The concrete fan house effectively <br /> stopped any further downslope progress of slide materials on the <br />' slope above, yet the pressures generated caused some cracking in <br /> the rear wall of the existing fan house structure. <br />1 <br />' Other minor sloughing of loose surficial debris occurred adjacent <br />to the debris flow chute and other localized areas surrounding <br />' the entry and belt portals. However, this sloughing was of <br />little consequence to the operation of the mine. Many other <br />t slides similar in nature to those described earlier which <br />' affected the mine were observed to occur at remote locations. <br />' 2.0 RELATIONSHIP TO lIINING <br />Of course, it is well known that the mine site is located in the <br />' center of a large slope failure complex. The instability events <br />' observed were independent of the mining activity (i.e., the <br />slides were not induced by mining). Rather, the mining operation <br />' was simply in the way of these naturally occurring events. one <br />possible exception to this would be the slides occurring <br />2 <br />