Abstract
The association of anomalously high levels of ammonium with both metallic and energy mineral deposits is of potential use in mineral exploration. Conventional geochemical methods for detecting NH4 often provide only whole-rock NH4 values and do not identify the specific minerals hosting NH4. They may also lack sensitivity or be prone to interference. Evolved NH3 analysis is shown to be capable of distinguishing between different NH4-bearing minerals and can detect NH4 values down to 120 ppm in rocks hosting silver-gold vein mineralization. Fully quantitative determination of NH4 by this method is not possible as the NH3 evolved from minerals during heating partially oxidised; however, amounts of evolved NH3 do show a moderate positive linear correlation with NH4 content determined by a modified Kjeldahl method.
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