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Demonstration of Compliance Climax Molybdenum Company <br /> With Regulation 41 Permit M-1977-493 <br /> Given that dissolved manganese is ubiquitous across the Climax property in both shallow and <br /> deep groundwater wells, that the range of Eh-pH conditions is fairly limited, and that there are no <br /> other constituents typical of mine waters (other than iron) which are also present across the site, <br /> dissolved manganese is interpreted as a naturally occurring constituent of groundwater within the <br /> Climax property. While some portion of the manganese may be from mining-related sources,this <br /> background information suggests that other non-anthropogenic sources are likely also present. <br /> This is supported by regional data within Colorado with similar ranges of dissolved manganese <br /> concentrations identified in groundwater. This additional available information is informative in <br /> assessing the historical manganese data from the property. <br /> December 2016 5 <br />