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Mining Methods and Slope Stability Evaluation for Expanded Development of the Walstrum Aggregate Quarry <br /> For practical purposes,the most favorable mining directions for developing stable temporary rock <br /> walls at the Walstrum Quarry are directions that are east, north and west—or in between these <br /> directions. Mining walls in a direction aimed less than 45 degrees from south should be avoided. <br /> An example bench-development sequence using preferred mining directions is shown in Figure <br /> 4.2. <br /> Expanded Permit Boundary <br /> !''� • <br /> Approximate / AVOID MINING <br /> Expanded IN DIRECTION / <br /> / Quarry WITHIN 45-deg <br /> Limit OF SOUTH j <br /> Preferred / <br /> j Mining I <br /> Direction <br /> I Preferred <br /> Mining <br /> Direction •�• <br /> Approximate / <br /> Limit of ! <br /> Existing Preferred <br /> '• Mining 8� <br /> • Mining 1 <br /> Reclamation Direction• Planned <br /> Mining Limit <br /> Vlhthin <br /> q Current <br /> Permit <br /> ••.,• 1 Boundary <br /> I <br /> N i <br /> Figure 4.2—Preferential Mining Bench Wall Orientations and Mining Direction <br /> REVEY Associates.Inc. Page 8 of 14 October,2001 <br />