Laserfiche WebLink
Investigation into Continued Damage at the Solitario Ranch Page 4 <br /> <br /> <br /> <br /> <br />1 <br />Reuorts on Mine Subsidence Studies done on NeiPhboring Mines s <br />Final Report Contract No. DE-AC22-SOPC30117 <br />Characterization Of Subsidence over Longwall Mining Panels by Woodward- <br />Clyde Consultants for the US Department of Energy, September 19,1982. <br />This was a subsidence study conducted at the Allen Mine, over both longwall <br />and room and pillar sections of the mine. The plan was to extract the pillars and <br />compare the subsidence to the longwall section. The mine was shut down before <br />the study was complete. The Allen mine is the New Elk Mine owned by Basin <br />Resources and is located about one mile to the west of the Tatum property. <br />Information in this report was supplemented by a personal conversation with <br />Mr. Jack Snow; the retired mine superintendent of the Allen mine who lived in <br />Trinidad Colorado. The purpose of this interview was to confirm that measurable <br />subsidence occurred over the room and pillar sections of this mine. He confirmed <br />this fact and in fact noted that in one area, subsidence collapsed a portion of <br />Colorado State Highway 12, which runs up the Purgatory Valley. <br />The actual survey data used for this report was obtained from the files of the <br />Denver office of the Bureau of Mines. <br />Rock Mechanics Instrumentation Program for Kaiser Steel Corporation's <br />Demonstration of Shield Type Longwall supports at York Canyon Mine, Raton <br />N.M. Contract No. U.S. D.O.E. ACOl-74ET12530, May 1981, by the Colorado <br />School of Mines for the U.S. Department of Energy. <br />This was a study on instrumentation to measure subsidence over the <br />underground mining operations. The work included survey measurements and <br />noted land slides or soil creep that actually caused the survey monuments to <br />rise. This mine is only a few miles south of the Tatum property, across the state <br />line. <br />Mincic Surveys <br />Mr Michael Mincic is a surveying contractor located in the Trinidad, Colorado <br />area. Mr Mincic surveyed the subsidence control points set by Basin resources at <br />various locations over the underground mining areas. These points were part of <br />the subsidence-monitoring program, required as conditions to the mining permit. <br />Some of the reports, based on these surveys were submitted to the state and are <br />part of the state file, which is available to the public. <br />Included in the appendix are copies of his surveys done in 1993, which showed <br />movement, both horiaontally and vertically in the monuments set at the railroad <br />tracks, over the 1N Section of the Golden Eagle Mine. This was compared to a <br />Basin baseline survey made on 5/26/885 of the same points. The Basin survey <br />was not completed until after mining work in 1N had already proceeded under <br />the monuments a Subsidence could have already occurred before the baseline <br />was established. <br />The results of this survey were challenged by Basin because he used a total <br />station survey instrument and calculated the vertical distances (elevations) <br />using vertical angles and precise distance measurements. Mr. Mincic resurveyed <br />the points using a spirit level instrument down the railroad tracks, a method <br />Available at the Arthur Lakes library, Colorado School of Mines <br />5 Copy of Mincic survey notes included in Appendix 7. <br />s Basin Mine Progress Map, 3/21/94 copy of small area included in appendix 3. <br />