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'f ~ • ~ ~~~ ~~~~~~~~~~~~~~~~ HydroTerra, Inc. 4221 Purdy Mesa Road Whitewater, CO 81527 (970)242-4454 Thomas A. Schreiner February 3, 1998 , _ _ ,,, i~ Division of Minerals and Geology ~ ~~g~ Department of Natural Resources Q $ ~/ 1313 Sherman St. (~v~~ ~ ~~y ° Denver, CO 80203 Re: Permit M-97-098 - Flag Creek Mine, 1 12 Conversion Application -Response to Review Comments Dear Mr. Schreiner, We received your comments and have made the required changes in the application exhibits (enclosed). Following are the responses to your comments: Comment 1, on Mining Plan (Exhibit C) -requires revisions to Exhibit C to show total area of affected land. Response -Page 4 of the project report has a table of proposed disturbed area which includes the existing roads, the staging area, and the mine area. These areas are labeled on the map and the table has been added to the map for clarification. The to sotl borrow area has been added to the ~ map and the disturbed area acreage. /cW ~Q~ a~.~/~ ~,~ ~~~.-~,( `tnt ~-,a,~...,, X40 ~~:~ Comment 2, related to Rule 6.4.4(d) requiring the size of area(s) to worked at one time. ~ ~~ Response -The maximum extent to be worked at one time would be the total area of the phase of mining in progress during a particular phase. For instance, Phase 1 could conceivably involve working an area up to 55.5 acres. The initial area proposed for terracing is about 10.7 acres as ~ u / shown on exhibit F. It is unlikely; however, that the entire phase area will be worked at one _,,,f~E ~~~ time, because it is wilikely that desirable rock exists over the entire area. The flagstone is o{/~ ~~ covered in many places by a thin veneer of rubble and vegetation makutg it difficult to determine/ /~ the nature of the bedrock. It is not economical or customary to do exploration and resource ~ 9'`'~~t delineation for this type of mining, thus, the extent of desirable rock is generally unknown until y well into the mining of an area. As we discussed on the telephone, the plan is to provide ~ ,~, f /1 ~_ ~ _ individual maps for each of the proposed phases of mining prior to the start of that phase. The ,,,..• ;"1,,,./ operator wishes to bond reclamation for 1 phase at a time and will notify the Division of anypp~~:~~-~ ~ „/,,~"' major changes to the mine plan due to conditions discovered during the mining operation. y'~~;> lye; • -~ Comment 3, related to topsoil depth and borrow area. ~"~• ~ Response -The plan is to replace topsoil on areas where less than 2 inches of soil remains after mining is completed. The plan shows a series of 12 terraces which will cover approximately 10.7 acres of land. This is based on the area outlined on the Exhibit F plan. The actual flat surface area of the terraces will be approximately 80% of the 10.7 acres or about 8.5 acres (this area is based on the terrace cross section provided on Exhibit F). The replacement soil will be /ULY~ g ~ ~ v,.aQV (~ ~~ ~jyAnc+-~ °~ ~ " Q.