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1990 PROJECTED SUBSIDENCE IMPACTS <br /> • Projected subsidence impacts are based on previous monitoring data <br /> and subsidence projection plans as well as 1990 mine plan designs <br /> at the Orchard Valley Mine and Orchard Valley West Mine. The 1990 <br /> Monitoring Program will basically concentrate on the monitoring of <br /> wide-spaced grid stations 6, 14, 89, 90, 92, and 93 which are <br /> located at the Orchard Valley West Mine plus wide-spaced grid <br /> stations 19 and 27 along with close-spaced grid stations 28-69, 42- <br /> 51, and 201-334 that overlie the Orchard Valley Mine. <br /> Projected Impacts and Survey Monitoring <br /> The Subsidence impacts projected to occur during 1990 are expected <br /> to occur over the Panels G and H. <br /> COVCC expects minimal movement of wide-spaced grid stations and <br /> high-resolution grid stations during 1990. Development mining in <br /> conjunction with retreat pillar extraction under overburden depths <br /> similar to 11 and 12 North panels while utilizing partial pillaring <br /> methods should produce minimal subsidence movement as measured <br /> within the Orchard Valley Mine. <br /> • <br />