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Visual Monitoring <br /> • Visual subsidence monitoring is accomplished by periodic <br /> "walkovers" of mined areas within the present permit area. <br /> Walkovers are generally done in conjunction with survey monitoring <br /> due to the seasonal accessibility of the area. <br /> Visual monitoring is concentrated over areas of retreat mining <br /> (past or present) , in particular areas mined under low overburden. <br /> • <br /> • <br />