Secondary arsenic minerals and arsenic mobility in a historical waste rock pile at Kank near Kutna Hora, Czech Republic

作者：Kocourkova Vikova E^*; Loun J; Sracek O; Houzar S; Filip J

来源：Mineralogy and Petrology, 2015, 109(1): 17-33.

DOI：10.1007/s00710-014-0356-0

The arsenic mineralization in historical waste rock pile at KaAk site near Kutna Hora developed over a period of about 500 years. The objective of this study was to determine principal secondary arsenic mineral phases and their environmental stability. The only common primary As-bearing mineral - arsenopyrite - occurs in the mineral assemblage of Kutna Hora base-metal deposit together with quartz, pyrite, sphalerite, and pyrrhotite. Most of arsenic is bound in supergene minerals (scorodite, jarosite-beudantite, bukovskA1/2ite, pitticite), which are relatively stable under oxidizing conditions prevailing in the pile. The KaAk site is a type locality for bukovskA1/2ite, kaAkite, zA1/2kaite, and parascorodite. In long-term perspective, the most stable minerals from viewpoint of As-binding appear to be scorodite and beudantite. A higher mobility was observed for As incorporated into jarosite and poorly crystalline to amorphous phases (FeIII -oxyhydroxides, pitticite). This study has not confirmed significant mobility of arsenic within the pile and water infiltrating in recharge periods of the year (late winter-early spring) should not mobilize arsenic at a significant rate. However, monitoring of the stability of secondary As-phases and dissolved arsenic in the environment around the pile is required to avoid future migration of arsenic out of the pile.

• 出版日期2015-2