APPCOR11526 - Laserfiche WebLink

Home Browse Search

Memo to Jim Stevens Rimrock Geotechnical Adequacy page 2 4. The operator eludes to both a permanent spoil pile and a temporary overburden storage pile at various locations throughout the application. It is logical that some spoil storage will be necessary to develop the initial 1.5 acre pit. A permanent Excess Spoil Pile can only be approved, in accordance with Rule 4.09, if the material is not required to achieve approximate original contour within the mined area. Based upon the limited material balance information contained within the application, it appears that a deficit of bulked spoil will occur rather than an excess. I can imagine numerous scenarios for material movement, which result in temporary storage of spoil for later regrading. The operator will need to amend the application to present a clear plan for the movement, storage and placement of spoil materials during the project life. A projection of mass balance, including projected bulking of excavated material should be included within the application, in accordance with Rule 2.05.3(6). If spoil storage is anticipated, the applicant should also provide the information necessary to comply with those requirements, also contained in that same rule. 5. The discussion of mine facilities is inadequate to satisfy the requirements of Rule 2.05.3(3). The applicant should thoroughly describe the intended surface facilities, including a map of the intended configurations. Items such as all structures, conveyors, coal storage piles or structures, coal waste storage piles or structures, non-coal waste storage and disposal, shops, and any loadout facilities should be described and located. Sealing and Managing Mine Openings (Rule 2.05.4(2)(9) The applicant intends to intercept old underground mine workings of the abandoned C,F & I Engle Mine. Based upon the geological structure and the mention of mine drainage being a component of base flow in Engleville Gulch, it is likely that water may be encountered in the exposed workings. The applicant will need to develop an alternative seal for use in the event that water is encountered in exposed workings. Use of Explosives (Rules 2.05.3(6)(a) and 4.08) 1. In general, insufficient information is provided to satisfy the general narrative requirements of Rule 2.05.3(6)(a). The applicant doesn't clearly state the maximum number of holes to be fired simultaneously. There is no discussion or map location of explosive storage facilities. There is a mention, but no elaboration of types of monitoring seismographs to be used. Their is no explicit presentation of drilling patterns, delay configurations, and separate hole loading. The applicant will need to provide a clear and detailed discussion of all the topics required under Rule 2.05.3(6)(a).