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A potential systematic error in the analysis of gold samples stored in plastic containers

Authors
Journal
Applied Geochemistry
0883-2927
Publisher
Elsevier
Publication Date
Volume
7
Issue
3
Identifiers
DOI: 10.1016/0883-2927(92)90044-4

Abstract

Abstract Experiments were carried out on the sorting of Au grains from the fine fraction (<0.064 mm) of till samples stored in plastic containers. Gold-bearing till samples were reanalysed after being stored for one year. The transportation distance between the laboratory and the storage building was ≈20 km. It was noted that whereas the superficial layer of all the samples was reduced in Au, the basal layers and walls of the containers were enriched. It was also demonstrated that the sorting of Au grains and Au-bearing minerals was enhanced not only by gravity separation but also by the electrostatic adhesive forces between them and the walls of the plastic containers.

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