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RECEIVED <br />June 30, 2015 JUL 0 6 2015 <br />Michael Cunningham <br />Division of Reclamation, Mining and Safety DIVISION OF RECLAMATION <br />1313 Sherman St. Room 215 MINING AND SAFETY <br />Denver, CO 80203 <br />Re: Sprague Stone; DRMS File No. M-2015-006; Adequacy Review No. 2 <br />Comment and Response <br />1. The Applicant has stated the working decks are comprised of 20% rock overburden. Please <br />specify the volume of overburden in the working decks of the three areas to be quarried. This <br />information is required to calculate the financial warranty estimate. The volume of overburden <br />shall be specified as cubic yards. <br />Response: A statement has been added to Exhibit E noting the 20 percent of overburden <br />in all three active working decks is equivalent to 2,796 cubic yards. It also describes a <br />new location for storage and haul distances. A note has been added to Exhibit C.2 -it <br />shows the physical location of the storage area. <br />2. The Applicant has stated that waste rock generated from the quarry operation will be contained <br />within the active quarry area and that no stockpiles will be needed. Please describe how this <br />material will be contained within the active quarry area. Presumably this material will need to <br />be placed around the perimeter of the excavation in order to excavate slabs of sandstone. Until <br />such time as the waste rock has been graded onto the mine face, the Division must bond for the <br />replacement of this material. The applicant must specify the total volume of waste rock that will <br />need to be replaced onto the mine face for all three areas to be quarried. The volume of <br />overburden shall be specified as cubic yards. In addition, specify average volume of waste rock <br />which would need to be replaced on a per acre basis. The Division will use this information to <br />calculate the financial warranty liability for future mining phases. <br />Response: Along with the 20 percent of overburden calculated in comment number 1 <br />above, the volume of waste rock has been estimated based on a 2 foot layer across the <br />working decks. It has been noted in Exhibit E as being approximately 1,520 cubic yards. <br />The push distance of the waste rock will be between 30 — 50 feet since it will be stored <br />on or near the working deck. <br />3. The Applicant's response to the Division's preliminary adequacy review did not include full size <br />copies of the Stormwater Management Plan Map or of the Stormwater Management Detail <br />Sheet. Please provide the Division with full sized copies of these documents as requested. <br />Response: A full size copy of the Stormwater Management Plan Map is included with <br />this submittal. <br />4. The Applicant has stated that the available topsoil will be incorporated into the bench rather <br />than stockpiled. This method of salvaging topsoil is not acceptable. Pursuant to Construction <br />