Supergene geochemical feature of gold and its implications for anomaly evaluation

The gold exists mostly in supergenic media including underground water, surface water, and stream sediments by six facies, such as soluble facies, surface adsorbing facies, organic facies, natural gold facies, iron and manganese oxides facies, and sulfide facies. The gold displays more siderophility, but has sulphophility under supergenic environment. In the process of practically evaluating supergenic anomaly, it should deeply analyze geological and geophysical landscape environment, and determine supergenic geochemical feature of anomalous elements by studying supergenic environment indexes(pH, Eh, Ec, temperature, rainfall, and so on) in anomaly location, and research anomaly-forming mechanism in order to systematically particularly evaluate anomaly on the basis of compositing geological factors. In fact, on the basis of understanding the law of gold supergenic transportation and enrichment, it can reach good anomaly evaluating exploration effect by using anomaly proving→elements facies analyzing→anomaly judgement and ordering→checking and estimating→validating work procedure during concretely evaluating gold supergenic anomaly, and illustrate by case in Huangjiawan region.