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~ -, • • <br />Gold Hill Mill 2 May 19. 1995 <br />patented claims in order to supply feed-stock for the Gold Hill Mill, as <br />is indicated in item 4 of your May 2, 1995 submittal, you would have to <br />obtain a reclamation permit for those activities. The permit application <br />currently under consideration contemplates a milling operation only, and <br />mining would not be permitted under the terms of the proposed Exhibits C <br />and D. In addition, if COM, Inc. were to propose mining on the Wynona or <br />Who Do claims, adequate information on legal right to enter these claims <br />would have to be provided, and an appropriate permit obtained. <br />5. Enclosed please find a copy of a letter from Boulder County Land Use <br />(you have previously been provided a copy of this letter via facsimile). <br />Boulder County has indicated that the mill building could likely be put <br />to an acceptable post-operational use. Once you have worked this out with <br />the county, please provide a description of the beneficial use for <br />incorporation into the reclamation permit. Also, delineate the parking <br />area proposed to remain as a post-operational feature on the surveyed map <br />to be provided. This parking area must be of a reasonable size. All <br />areas within the permit area other than the building, parking area, and <br />roads will have to be revegetated in accordance with the approved plan. <br />6. One of the chief concerns remaining for approval of the COM, Inc. <br />application is identification and characterization of borrow sources for <br />material to raise the tailing dam, and to provide rock cover for the <br />tailing surface at the time of reclamation. You have indicated in the May <br />2, 1995 submittal that material for the dam raise will come out of the <br />area behind the existing impoundment. The Division is concerned that <br />bedrock may be too close to the surface to allow excavation sufficient to <br />produce the volume of borrow material that will be required. Please <br />provide a characterization of material availability in this, and in any <br />other proposed borrow areas. Material availability characterization <br />should be based on test pits or other appropriate criteria. You indicated <br />in our meeting on May 16, 1995 that the mine dumps on COM, Inc. property <br />may also be used as borrow sources. If the dump material is proposed for <br />use, it must be characterized in terms of both its physical and its <br />chemical characteristics. In terms of chemical characterization, polished <br />section analysis of representative dump samples should be conducted to <br />determine pyrite percentages. You may also wish to analyze for percentage <br />of carbonate minerals that may provide buffering capacity. In general, <br />dump material with less than 2 percent pyrite would be of less concern <br />from an acid generation stand-point, however, this should be verified by <br />leaching tests such as the meteoric water mobility test. Dump material <br />that is higher in pyrite must be placed in the center of the dam fill, <br />encapsulated by the less pyritic material. <br />In your letter dated May 2, 1995, it is stated that the proposed borrow <br />area behind the impoundment has been stripped of topsoil. During our May <br />16, 1995 meeting, it was indicated that most of the topsoil is still in <br />place. Please clarify this issue by providing a commitment to strip and <br />preserve all usable topsoil from areas of new surface disturbance. <br />