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56 <br />need treatment. <br />3. Keep water from rock which promotes acid mine <br />drainage and divert it if possible to places which <br />will control acid mine drainage. <br />In general then, the stress here is on separation, <br />diversion, and other methods of control besides the brute <br />force addition of lime coupled with waiting for settling to <br />occur. In this regard, Hyatt (38) has prepared an excellent <br />article outlining techniques that can be tried to make water <br />effluent treatment more manageable. His article primarily <br />deals with mill wastes and in this division of the ore <br />dressing industry many of the BATEA limits for 1984 are for <br />zero discharge to be maintained. Hyatt points out that <br />natural waters from the ground or the air that find their <br />• way into the. process will have to be treated as if they <br />were coming from the process. Obviously, diversion and <br />separation techniques have to be considered to keep process <br />operations from being controlled by the whims of nature. <br />WATER IN UNDERGROUND OPERATIONS <br />Water from conduit aquifers should be kept from under- <br />ground operations as much as possible. This water has a <br />direct connection from the surface to the tunnels and this <br />situation makes the water a nuisance and perhaps dangerous. <br />The flow can vary greatly with precipitation and spring <br />runoff so control of the amount of conduit aquifer water is <br />difficult. At best, it can cause intermittent flooding; at <br />•