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<br />- 3- <br />2. Since there is already in place approximately 70 million tons of ore is i[ safe to assume there is <br />already 140 million tons of overburden presently located in AGOSA and SGOSA? <br />3. If that is the case, under this amendment, the operator plans to extract 180 millions tons of ore <br />which is expected to produce 360 million tons of overburden. The total ore that will be placed <br />in Phase I and [I Valley Leach Facility (VLF) (AtVI-06 and AM-07) is 1 l~ million tons, which <br />will produce 230 million tons of overburden. <br />When the 230 million tons is added to the 360, you will have a total of 590 million tons of <br />overburden. The total amount of overburden storage area approved under AM-07, AGOSA, is <br />35 million tons. According to what is repotted, you only have storage capacity for 445 million <br />tons under AM-08. The operator does not even plan to expand the Arequa (AGOSA) to <br />maximum storage and elevation as approved under AM-07. In fact, there are future plans to use <br />the Flat areas as temporary topsoil stockpile location. <br />a. Where is the additional overburden going to be placed? <br />b. Please identify the total amount of overburden that will be used to backfill the pits. If <br />that's where the excess over burden will be placed, for the excess overburden that can <br />not be accounted for, the operator can designate an area or areas and submit the <br />specifics at a later date through a revision process. <br />c. The operator mentions possible offloading of ore and detoxifying it somewhere within <br />the permit area. Please indicate area or areas that would accommodate such an <br />operation within the permit atea. Specific designs for such an operation can be <br />submitted as a Revision at a later date. <br />E. Backfilling of the North, East and South Cresson Mine is mentioned. <br />1. Please quantify and provide an appropriate topographic map showing the actual configuration of <br />these areas after backfill. Without such information, the Division can not calculate the <br />appropriate warranty. <br />F. On Page 5.4.2 Operator states, "where present in adequate thickness and area (greater than six inches in <br />depth over an area of at ]east one acre in size), soil suitable for assisting in revegetation will be removed <br />and stockpiled or direct hauled to reclamation sites." Given the limited amount of growth medium, all <br />available topsoil has to be salvaged for reclamation even if temporarily stored in areas not designated as <br />topsoil storage areas. <br />G. Pit wall bench design according to the slope designs provided in Volume II North Cresson Mine area <br />slope stability Evaluation, is as follows: <br />North Cresson A, B, and C, and East Cresson Extension Mine, all slopes are to be 60°, triple bench. 105 <br />feet vertical between benches. However, Figure 10 through 12 triple bench - "60° slope and 45°" slope <br />with and without break show what ao~ezsed to be ``en_hes e+'en :~; fzet hei_h[. oVezse c`:arif+. <br />H. CCgV proposes [o remediate open or collapsed laterals/inclines/aditc by blastine the crown pillar then <br />backfilling the depression (if any) with Structural Fill. After which the area will be capped with <br />°eo~rid. This method of closure is okay. As an alternative, CCB:V proposes to plug the open lateral via <br />an injection of a Flowabl~° fill into the excavation without further exca+atior. or blasting. CC~CV does <br />~w;: <br />