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36 <br />• Plume District, 5 adits from the Boulder Tungsten District, <br />and 6 adits from the Gold Hill District. The concentration <br />ranges of the constituents in the effluents from each dis- <br />trict are summarized in Table V. The water chemistry of <br />all 15 of these effluents compares with that of the Central <br />City Peripheral Zone. Finding a mine effluent in the Front <br />Range that is comparable in water chemistry to the Argo <br />Tunnel which drains the Central City central zone has been <br />quite difficult. <br />Why is it that the water quality of mine drainage improves <br />considerably when leaving Central City? The ground water <br />aquifer system is not the cause since all the effluents are <br />of the diffuse- f-low-type-. The type-of mineralization is - <br />• not the cause since other adits have also bored into pyritic <br />gold, especially in the Gold Hill District. It is felt that <br />two other parameters have to be considered to explain these <br />differences. The first is the occurrence of the ore body; <br />localized veins of ore occurring in rock impervious to <br />water is one extreme example, while ore disseminated through <br />highly fractured rock which has a high porosity represents <br />the other extreme. Diagrams of the vein system and the dis- <br />seminated system are presented in figure 7. <br />The disseminated ore system allows more intimate contact <br />of the ground water with the vein minerals and also insures <br />a diffuse flow aquifer. The Central City District with its <br />breccia pipe glory hole in the central zone is just such an <br />E <br />