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r <br /> <br />1. Homogeneity and areal extent of the aquifer <br />2. Recharge to the aquifer and discharge from the aquifer <br />3. The rate at which the pit is opened and backfilled <br />4. Mixing 'of waters of different quality in the overburden and ore <br />zone, and <br />5. Decline of water levels in the vicinity of the mine. <br />The hydrologic consequences of mining may thus be generally classified as <br />both short-term and long-term. <br />Aquifer tests were conducted in 1977 and the results summarized on Table <br />6 and Exhibits 23, 24, 25, and 26. The aquifer coefficients as determined <br />serve as a basis for the following calculations and discussions. It is <br />assumed that mine openings may be treated as either a large-diameter <br />• pumped or recovering well. The following common simplifying assumptions <br />of aquifer testing mathematics were applied: <br />1. The aquifer is homogeneous and isotropic. <br />2. The aquifer has infinite areal extent. <br />3. The discharge or recharge well receives water from the entire <br />thickness of the aquifer. <br />4. The coefficient of transmissivity is constant at all times <br />and at all places. <br />5. The well has a reasonably small diameter. <br />6. Water is removed from storage and discharged instantaneously <br />with a decline in head. <br />(J. G. Farris et al. 1962) <br />These simplified conditions are rarely found in naturally occurring <br />aquifers. In the case of the proposed mine, when conditions differ from <br />those assumptions they are discussed separately as to their probable <br />18 <br />i I <br />