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35 <br /> in the Argo Tunnel discharge water. All this data is taken <br /> from the study by Wentz (30). The regularity of parameters <br /> is remarkable for a natural system. In contrast, Shuster <br /> and White (28) found variations of over ±50% in specific <br /> conductance and concentrations within a few days for conduit <br /> aquifer springs issuing from limestone formations in Penn- <br /> sylvania. <br /> These differences between conduit and diffuse aquifer <br /> water are most important because they can be used to <br /> establish the type of ground water system that prevails in <br /> a mining operation. Such knowledge is essential for estab- <br /> lishing a reasonably uniform procedure for maintaining water <br /> quality.. In addition, the type of water issuing from an <br /> adit face is indicative of what is beyond that wall. So, <br />• <br /> investigation of the changes in water over a period of time <br /> can be used as another prospecting tool. Any piece of infor- <br /> mation which can tell a mine operator what's behind the mine <br /> face can be critical when it comes to determining whether <br /> that face should be extended. The methods used to establish <br />the type of aquifer will be discussed in the chapter on <br />analytical procedures. <br />ORE OCCURRENCE VS. WATER QUALITY <br />Recent research on the chemistry of mine effluents in <br />the Front Range has involved the comparison of effluents in <br />other mining districts with those in Central City. Analyses <br />have been made on 4 draining adits from the Georgetown-Silver <br />•