2004-01-06_REVISION - M1978056 - Laserfiche WebLink

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-~ ~~ March 28, 1978 Mining Plan _ . _.. Mining of the entire tract is expected to take place over a period of between 25 and 3b years. The timetable cited below reflects the maximum time expected to complete each phase. Depth of material ranges between apparently 20 and 50 feet. Phase I through VII will be mined with a dragline, while Phases II-A through X-A will be mined with a dredge due to deeper deposits; mining by these methods will not require de-watering. Prior to actual mining, topsoil will be stripped utilizing scrapers, dozer and frontend loader. Topsoil averages approximately one foot across the permit area. Initially, topsoil will necessarily require stockpiling unE'il a sufficiently large area is mined out, allowing fox new topsoil heing strip-. ped from one area to be immediately utilized in backfilling and re-topsoiling a previously mined out area. As mining proceeds through each phase, final slopes are maintained as close as possible -ehind mining by maintaining slopes on native materials and back- filling with non-marketable sands, silts, clays and other oversize and undersize materials. This is an integral part of mining, as these materials would other- wise pose a disposal problem. Phase I Topsoil will be stripped from the area and will be stockpiled in the office area. It is expected that this soil will probably not be utilized elsewhere in reclamation, but will be graded over the office area upon removal of the office and scales. After topsoil is removed the area will be excavated using a dragline. A 15 foot wide "ribbon" of material will be left undisturbed between the excavated area and the water in abandoned gravel Pit "C" as indicated on the maps. The mined sand and gravel will be run through the plant located at Plant Site Ill. The operation of Phase I is expected to take 2 years. Phase II Topsoil will be stripped and be utilized to re-enforce the dike along the Cache La Poudre River and to backfill the west edge of Phase I. A dragline will be used to excavate the sand and gravel; material will be processed at Plant Site Ill. It will take approximately 2 years to complete Phase II. Phase III Topsoil will be stripped and used to backfill along the south and west edges of Phase II and to re-enforce the dike along the Cache Ia Poudre River. The dragline will be used to excavate material from Phase III. The plant will be moved to Plant Site 112. Opera- tions are expected to last for 3 years.