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MINING AND RECLAMATION PLAN ~ April, 1989 <br />MT. GUNNISON NO. 1 MINE <br />Upper Refuse Pile Subsidence Monitoring Plan <br />The Northwest Submain and three panel's are planned to be mined <br />under the area of the future Upper Refuse Piie. Construction of <br />the Upper Refuse Pi?e will commence~as 'the Lower Reuse Pile <br />reaches capacity and after subsidence of. ~ area. is 'complete. <br />Three additional subsidence monuments will be installed, one at <br />approximately S max above the 1S and 3S panels and th=Northwest <br />Submain, prior to retreat mining. Exhibit S-1 shows the proposed <br />location of the monuments. These monuments will be sunreyec~ once, <br />one year prior to the anticipated start of retreat mining. one <br />survey will be completed each year until subsidence is. complete. <br />Subsidence will be considered complete when twa successive years <br />of data show no movement other than that attributable to surficial <br />settling, survey error, or other reasons. <br /> <br /> <br />