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Traducere - engleză The brown coal mine “Babina” was created in 1921 as one of larger mines within the Muskau Arch area. In 1937, the coal production reached 225.5 thousand tonnes. After the WW2 both the underground and open-pit workings were developed. In 1973, following to deteriorating mining conditions and the related increase in costs, the mine was closed down. Workings, that became flooded with water in a natural process, were only partly rehabilitated by means of levelling of the slopes. After the coal mining was stopped, fire clays were extracted in small pits until late 1990s. The total area of postmining land of the “Babina” mine is estimated at around 430 hectares.
din poloneză în engleză: Scientific text on heavy metals in soil General field: Ştiinţă Detailed field: Chimie; Ştiinţă/inginerie chimică
Traducere - engleză Zinc, cadmium, lead and arsenic enter soils as a result of geochemical alterations of primary ore minerals to secondary sulphides, carbonates and oxides [22, 23]. During the following stages of oxidation of primary minerals significant quantities of heavy metals are released to soils as leachable compounds. In the soil environment ore minerals are oxidized, metal ions pass into solution from which they then precipitate as new mineral phases (sulphides, oxides, hydroxides and carbonates) [4].
Metals occur in the crystal lattice of sulphides, carbonates and sulphates [24, 25]. The major metals are Zn, Pb and Fe. Typochemical elements of ore minerals are Cd, Ag, Tl, As, Ba and Mn [2, 22]. Soils under investigation contain particularly high amounts of Fe in the form of sulphides and oxides (Fig. 1, Tab. 1). High susceptibility of iron sulphides to oxidation may imply that migration of geochemical elements related to iron minerals (such as Tl, As, Mn, Ni and Se) could be widespread. Due to limited floatability of Zn and Pb carbonates during ore processing, the proportion of these minerals in wastes and soils is high.
din engleză în poloneză: Scientific text on heavy minerals General field: Ştiinţă Detailed field: Minerit şi minerale/Pietre prețioase
Traducere - poloneză The main component of the heavy mineral fraction is rutile with anatase (TiO2). These two minerals of titanium make up for 50.1 % of the concentration of all heavy minerals. Rutile and anatase grains are medium or poorly rounded. It is possible to observe columnar or acicular crystals which are frequently crushed. Rutile is characterised by red, brown and yellow internal reflexes, while the typical reflexes of anatase are white-yellowish. These both minerals are easy to polish. The most widespread rutile crystals are those with red - brown internal reflexes. Rutile grains contain inclusions of pyrrhotite and pyrrhotite-chalcopyrite aggregates. The inclusions may reach 25 µm in diameter.
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