Abstract
The sources and sinks of manganese in underground coal mine workings are poorly understood compared to those of iron. The geochemical system in the secondary egress drift of Caphouse Colliery near Horbury, UK, is an ideal system for studying these processes. Five locations along the drift and four secondary inflows to the drift were sampled 24 times through the year commencing May 2005. During the sampling period, the pH in the main channel varied from 6.73 to 7.93 and increased along the flow path. The secondary inflows to the drift from the strata were of higher alkalinity (mean = 385 mg/L as CaCO3) than the main flow (mean = 330 mg/L as CaCO3); the affects of mixing between the less alkaline main channel and the more alkaline secondary inflows and of carbon dioxide exsolution are evident in the form of carbonate and hydroxide precipitates. SEM and XRD analysis of precipitates collected from the drift confirm the presence of calcium and manganese carbonates and ferric hydroxide. PHREEQC speciation and solubility modelling confirms supersaturation of the water in the main channel with respect to ferric oxy-hydroxides; iron, manganese, magnesium and calcium carbonates; and manganese oxides.
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Kruse, N.A.S., Younger, P.L. Sinks of iron and manganese in underground coal mine workings. Environ Geol 57, 1893–1899 (2009). https://doi.org/10.1007/s00254-008-1478-7
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DOI: https://doi.org/10.1007/s00254-008-1478-7