Fate of Heavy Metals in the Surface Water-Dump Rock System of the Mine Lupikko I (Karelia): Field Observations and Geochemical Modeling

Abstract

Abandoned mines are sources of potentially toxic chemical elements, although the development of these objects was completed. The Lupikko I mine area (Karelia Republic, Russia) is an excellent example of such technogenic objects. It is one of the largest mines in the Pitkäranta area, which was abandoned more than one hundred years ago. The dump rocks here are characterized by significant mineral diversity. Disseminated ore mineralization of the study area contains heavy metals, which enter the natural waters due to the oxidative dissolution of sulfides. Dump rocks and water from the Lupikko I mine area were collected to research the behavior of toxic elements. The samples were analyzed using ICP-MS, ICP-AES, potentiometric titration, ionic chromatography, X-ray microanalysis, X-ray fluorescence, and SEM to obtain information about the geochemical environment. According to new data, the content of Fe, Zn, Cu, Pb, Cd, and Ni in the natural waters of the mine significantly exceeds the geochemical background. For a more detailed study of the behavior of heavy metals, equilibrium-kinetic modeling, which considers the dissolution rate of ore minerals and the accumulation of toxic elements over time, was applied. A comparison of modeling data and field observations agreed. It was also found that for accurate modeling of Fe behavior, it is necessary to consider the organic matter content. Despite some model limitations, such retrospective assessments allow us to approve the applicability of this method for forecasting estimates.

Heavy Metals in Soil and Plants During Revegetation of Coal Mine Spoil Tips and Surrounded Territories

“…Moreover, long-term self-heating of stockpiles caused the formation of sulfuric acid that interacts with calcium carbonate and accelerates the hydrolysis of feldspars with the formation of kaolinite at such high temperatures -Al [Goncharova, 2015;Opara et al, 2023;Sidkina et al, 2022;Dold, 2017] Oxidative processes on the surface of spoil tips result in the formation of sulfuric acid, leading to severe acidification of the environment. This process causes the acidic components to spread over considerable distances beyond the mining area, contributing to the pollution of both surface and underground waters with sulfate and hydrogen ions [Reshetnyak et al, 2022;Linetal., 2022].…”

The Influence of DOC on the Migration Forms of Elements and Their Sedimentation from River Waters at an Exploited Diamond Deposit (NW Russia)

“…The strongest impact on the natural landscape is exerted by the open-pit mining of minerals, the area of which is constantly growing. Mining developments lead to the emergence of geochemical anomalies of anthropogenic origin when elevated concentrations of individual elements and their compounds are observed in mining areas [3][4][5]. They are especially pronounced in surface waters and bottom sediments of streams and reservoirs, into which wastewater from mining enterprises that extract coal and iron ores is discharged [6][7][8][9][10][11][12].…”