_REVISION - M1980244 (31) - Laserfiche WebLink

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i~ ^., ~ + ~ j i. 4 3. ; '3f that is the case, under this amendment, the operator plans to extract 180 millions tons of ore ` iwhieh is expected to produce 3ti0 million tons of overburden. The total ore that will be placed ?in Phase I and II Ygltey Leach Facility (VLI:) (AM-06 and AM-07) is 11 S mittian dons, which `will produce 230 million tons of overburden. 5y ~., ... "' ~+"When the 330 million dons is added to the 360, you will have a tots! of 590 million tons of ' ~bverbusden. The total amount of overburden storage area approved under ANI-07, AGOSA, is `35 million tons. According to whet is reported, you only have storage capacltyfor 445 million ~tfins under AM-08, The operator does not even plan to expand the Arequa (AGOSA) toto ' maximum storage and elevation as gpproved under AM-07. In fact, there are future plans to "`use the flat greas as temporary topsoil stockpile location. " = !a. Where is the additional overburden going to beplaeed? Ytesponse iyG&sV has used a ratio of Z:1 for the future mining operations. This means that approximately 482 millibii.tons of overburden will be produced in the future as 241 million tons of ore are mined. The SGOSA and AGOSA aze designed to store a total, throughout the entire mining operations, of approtii~Yiately 445 million tons of overburden, of which about 84 million tons are already in place. Therefaie, of the 482 million tons of overburden expected to be mined, there is capacity for approximately 36t million tons in the SGOSA and AGOSA. The difference between ehe remaining capacity and the amount to be produced, approximately 121 million tons, wilt be used to backfill the Ee'st Cresson Mina Area and part of Main Crosson Mina Area. Bacldlling ie discussed in Seotion 5.7.3 bt6ginnitig on page 61 of the Project Description, Volume 1 of the permit application, b. Please Ident~ the total amount of overburden that will be used to bac~ll the pits. If that's where the excess over burde» will be placed, for the excess overburden that can nut be accounted for, the operator can designate an area or areas and submit the " ' ` '~ " specifics at a later date through a revision process. Response: As discussed above, approximately 121 million tons will be used to backfill the East Cresson Mine P:i•ea and part of the Main Cresson Mine Area. a ~.. 'c: The operator mentions possible offloading ofore and detox~ing i! somewhere within the permit area. Please indicate area or areas that would accommodate such an `1 operation within ihepermit area. Spec fc designs for such an operatson can be ~, . submitted as a li!evision at a later date. ;, ~ i, Response.CCxScV addressed the possible off-loading of ore and detoxification at another location within the Cresson Project affected area due to the identified VLF design capacity and the total estimated tonnage for Amendment No. 8 ore. Any such off-loading would be within the Amendment No. 8 affected area (With a potential site identified on Drawing C-4b in Attachment 4 of this submittal). The off-loading area (or areas) would be oonstruoted comparable to the VLF liner system beosuse that ie the design reviewed and approved by OMLR that has been successfully constructed and operated by CC&V. Areas storing solution would be triple lined with the remainder of the de~tificatitm facility doubic lined: As noted in the Amendment No. 8 application, however, specific designs for such off-loading area (or areas) will be provided at a future date as a revision to Permit M-8o-x44 if CC&V decides to pursue such an option. s Alteiiiatively, CCBcV will detoxify the spent ore in place on the VLF. Once the spent ore meets the detoxification standards, ail or part of the spent ore will be removed to provide additional new ore storage capacity. The detoxified ore will be placed as backfill in one of the mine areas or within the