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iii iiiiiiiiiiiu iii 999 STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Nalu ral Resources 1313 Sherman 51., Room 215 Denver, CO 80203 Phone: (3031 866-3567 FA%:13031672-0106 November 4, 1993 Mr. Jim Tatum Law Offices of Jim Tatum and Associates 8703 Bonhomme ov cow ti~ r Nc ~g$ • ~ re i6 ~ Ray Romer Governor Michael B. Long Division Dimaor Houston, TX 77074 RE: Tatum Property Concerns, Basin Resources, Inc., Golden Eagle Mine, Permit No. C-81-013 Dear Mr. Tatum: The Division received your letter of October 12, 1993, on October 18, 1993. We wish to take this opportunity to respond to your questions. Your first question asked whether the requirements of Rule 2.05.6(6)(b) concerning worst possible subsidence consequences were reviewed during the Division's original review of the Golden Eagle Mine permit, and if not, why not. Rule 2.05.6(6)(b) requires a description of the worst possible consequences which subsidence, if it were to occur, could have on structures and renewable resource lands identified per Rule 2.05.6(6)(a)(ii)(B). This description was provided. In Exhibit 24 of the Golden Eagle permit application, it is stated by the operator that "no subsidence is expected in the renewable resource area", due to room and pillar mining proposed with an extraction rate of less than 50~. Exhibit 24 contains calculations showing that such a mining operation would be expected to cause "minimal to negligible" subsidence over the room and pillar areas. Because the Tatum Property is in the area of renewable resource lands, namely the Purgatoire River alluvium, the worst possible consequence which subsidence was expected to have beneath the areas of room and pillar mining was "minimal to negligible". Because the Tatum buildings are however currently not situated over any room and pillar mined areas, and lie beyond any potential angle of draw, no subsidence effects are expected to affect these structures. Your second question asked why the Division has not enforced Rule 2.05.6(c), which requires a subsidence monitoring program. The Division has enforced this rule. A subsidence monitoring program per Rule 2.05.6(6)(c) for the Purgatoire River alluvium has been in effect since the first quarter of 1988 and is still in effect. This survey is being conducted two miles east of your structures, and just south of the Purgatoire River.