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<br /> <br />D. I ORY - PH4$F.~ <br />An investigation of both the present and proposed permit areas and adjacent <br />lands has revealed that there are no structures located over present or <br />proposed underground mining activities. The mine is in an open, relatively <br />untimbered hillside that is covered with saoebrush, wildgrass and other <br />natural vegetation: ~ There are no residences, roads, major drainages or <br />.other significant features overlying the mine site. <br />E. CONSEnUEPICES - PH4SE 2 <br />This mine has been operated since the early 1940's. There may have been <br />short periods when the mine was not worked. /It was noted from our surface <br />'.investigations, as well as our subsurface inspection that no evidence of <br />:subsidence has been seen over even the oldest workings of this mine. <br />Virtually all of the old workings of this mine are accessible and few <br />collapsed roofs or cave-ins could be seen. <br />If subsidence occurred the worst possible consequences may be diminished <br />range capacity for grazing. <br />F. ~I12~C1`~IJ~ - PH4SF 3 <br />In order to substantiate our feeling that subsidence will not occur we are <br />proposing to adopt the following program: <br />1.) Continue to observe the existing underground mined system for cave-ins <br />and movement. <br />2.) We will locate a minimum of nine (9) monitoring points. (See Exhibit 3.) <br />Three of these points will be along the fringes of the mined area, three <br />will be over rooms, and three will be over haulage tunnels. These will <br />be so located to get data over the shallow ~•rorkings, the more moderately <br />deep vrorkinas, and the deepest workings of the area. These monuments <br />will be located only in those areas that have been worked since 1976, <br />or area anticipated to be worked in the future. 'these monuments shall <br />be monitored at least once per year, and that for those monuments over <br />active mining areas, that the survey take place at least tvrice a year <br />to obtain the necessary data. <br />4. <br />