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ME1V~0: <br /> <br />FROM: Carl Gerity l <br />TO: Ann Tatum <br />DATE: Apri] 12, 1995 <br />SUBJECT: Progress Report on Tatum House Subsidence issues <br />The purpose of this report is to update you on several items that relate to the <br />subsidence problems with your house at Solitario ranch. This includes a review of <br />the letters and memoranda by investigators that have been submitted since the <br />initial report from Pioneer Engineering in January 1995. A correction to that report <br />would include a revision of the age of the house from 90 years to 60 years, this still <br />represents a long time to stand without damage. <br />As a result of the reference cited by Pendleton4 ,I conducted a literature search to <br />locate all work that had been done by the US Geological Survey or the US Bureau of <br />Mines in the Weston Colorado area. Only two studies were located, a report by <br />Woodward-Clyde Consultants for the Allen Mine, and a report by the Colorado <br />School of Mines at the York Canyon Mine in Raton, New Mexico. <br />CONCLUSIONS <br />The conclusions of the letter /memo by State of Colorado, Department of Natural <br />Resources, Division of Minerals and Geology,dated February 16.1995 and the <br />Office of Surface Mining in a Memo dated February 16, 1995 and a letter dated <br />February 28,1995 are not necessarily supported by the study by Woodwai-d- <br />Clyde at the Allen mine, or the report by Aguirre Engineers, Inc dated March 16, <br />1995.The latter concludes that mining related subsidence could have caused the <br />problem. <br />• The Office of Surface Mining used an incorrect model in their computer <br />subsidence analysis. The correct model indicates that mine-influenced ground <br />movement could certainly have affected the Tatum house. <br />MSHA maps are not required to be accurate with respect to surface features, <br />except railroads and highways. There are several examples related to the Golden <br />Eagle mine where they are not. <br />U. S. OFFICE OF SURFACE MINING <br />The letter dated February 28, 1995 from Charles E. Sandberg3 has mis- <br />characterized the requirements of MSHA in it's map rules. Mine maps are not <br />required to show surface features except for railroads and highways, and according <br />t~ Bill Kemp of the Denver MSHA office any surface features are incidental and are <br />certainly limited in accuracy to the acceptable range associated with the scale of the <br />map. <br />I PIONEERING ENGINEERING G.iUS tii. d//~mn S(. <br />CONSULTING ENGINEERS (dflddn, CUSP/_°i <br />Alining x En+;romwfa/ 1 6.d/ (Jd3) 4i9~2757 <br />