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Mr. Michael Cunningham <br />TR -04 Inert Fill Import Response to Preliminary Adequacy Review for Lariat Mine M- 1977 -251 <br />December 2, 2014 <br />Page 2 <br />Compaction <br />After the placement of each overburden lift, a scraper, with a full bowl, will wheel roll each <br />6 inch overburden lift until the materials are tight, meaning the tires sink 1 -2 inches into the <br />fill based on visual inspection of the fill. If necessary, water may be added to the fill to <br />assist with compaction. . <br />4. The Operator is proposing to import scrap brick over a period of ten years, with the <br />imported material remaining in a stockpile until the operation enters final reclamation. <br />Please note that the Division must bond for all non - product stockpiles which will be <br />used during reclamation. Alternately, the Operator may blend and backfill the scrap <br />brick into the pit as it is imported to the site. If the scrap brick is immediately backfilled, <br />then an adjustment of the financial warranty will not be necessary. Please specify if the <br />scrap brick will be stockpiled or if it will be backfilled upon importation of the material. <br />The grog will have to be stockpiled and will be placed in the pit as part of final reclamation. <br />The grog will be placed in two locations. Grog will be stockpiled at the south end of the <br />upper clay stockpile pad area and the southwest corner of the lower pad area. <br />Upper Pad Grog Stockpile Area <br />Quantity: 10,000 tons or 10,800 cubic yards <br />Average grade to backfill area: -1 % <br />Average grade backfill area: 0% <br />Average grade return to grog stockpile: 2.5% <br />Haul distance to backfill area: 300 feet <br />Backfill area distance: 500 feet <br />Return distance to grog stockpile: 600 feet <br />Equipment: Caterpillar 637 scraper <br />Lower Pad Grog Stockpile Area <br />Quantity: 25,000 tons or 27,000 cubic yards <br />Average grade to backfill area: 8% <br />Average grade backfill area: 0% <br />Average grade return to grog stockpile: -7% <br />Haul distance to backfill area: 1,300 feet <br />Backfill area distance: 500 feet <br />Return distance to grog stockpile: 1,350 feet <br />Equipment: Caterpillar 637 scraper <br />In addition, GSB would like to clarify that they will import approximately 3,500 to 7,000 tons of <br />grog each year depending on demand for clay from Lariat. The majority of the grog will be <br />hauled in the next 5 years, and then the quantity hauled will be reduced to an as needed <br />quantity based on the grog quantity stored at the brick plant. The anticipated end date for the <br />backfilling is when mining is complete. This could be 25 to 50 years depending on market <br />conditions, geology of the deposit, real estate values of the mine, and /or if the brick plant <br />continues operations. <br />