Laserfiche WebLink
All field construction and surveying will have to be completed in the summer <br /> months after the snow cover has melted and before the first major snow storm <br /> in the fall . <br /> Task II - Instrumentation Plan <br /> Mine Subsidence Engineering Company proposes to measure surface deforma- <br /> tion over panels 301 and 302 at the Mid-Continent Resources , Inc. , No. 3 Mine <br /> (Figure 2) . The surface response to mining shall be determined through the <br /> measurement of both vertical and horizontal displacements of the ground- <br /> surface. Subsidence response would be obtained for the second or lower lift <br /> on panel 301 (301L) and for both lifts of panel 302 (302 and 302L) . The time <br /> required to completely mine all three lifts will be approximately 61 months. <br /> The time required to complete the proposed subsidence investigation and final <br /> report will be approximately 73 months assuming the contract commnences on <br /> October 1, 1980. <br /> The difference between mining time and project duration ;s caused by the <br /> ;_3a^_er-i-.pcscd delay in completing the final , after mining SUr`ley. <br /> mining is to be completed in October 1985, the final survey can not per- <br /> formed until the snow cover has melted off in July 1986. <br /> A variety of techniques were explored as possible methods to monitor <br /> subsidence in the study area. These included areal and terrestrial :ho'o- <br /> gramme-try, remote position monitoring instriuments and conventional <br /> Preliminary engineering analysis indicated that conventional surveying and <br /> areal photograrr.ietric methods would be the most cost effective mon �orir.g <br /> . techniques. <br /> An on-the-ground site reconnaissance was conducted by dine Subsider. <br /> ce <br /> Engineering personnel on July 20 , 1980 to explore the applicability of t41- <br /> he <br /> -7- <br />