# Metal Mobility in Afforested Sites of an Abandoned Zn-Pb Ore Mining Area
## 3 Results  
### Soil Characteristics  
#### 3.1.1 Profiles from the Heap at Lgota  
The depth of the soil profile I from the heap at Lgota (Figure 1) equals 2 m. Black humus of a very low bulk density (about 0.4 g\(\cdot\)cm\({}^{-3}\)) constitutes the top 7 cm stratum of the profile. pH\({}_{\mathrm{KCl}}\) in this layer is lower than 6.1, while water (about 50%) and organic matter contents (expressed as LOI value--53%) are the highest of all the samples in this profile. The content of carbonates in this stratum is relatively low (6.53%). Below the 7-cm top layer, there is a 1.30-m-thick layer of yellow loam with loosely dispersed fine stones up to several cm in diameter. Its bulk density varies from 0.88 to 1.13 g\(\cdot\)cm\({}^{-3}\). pH\({}_{\mathrm{KCl}}\) changes from 7.1 to 8.0, water ranges between 20% and 27% and organic matter content is between 1.53% and 2.46%. The carbonate content is very high and changes from 74.3% to 88.2%. These strata are intercalated with grey loans containing a large number of rock crumbs. pH\({}_{\mathrm{KCl}}\) attains a value of 8.5, with the bulk density of 1.21 g\(\cdot\)cm\({}^{-3}\), while LOI is only about 1.2% and carbonate content is higher than 90%. At a depth of 1.38-1.44 m, an increase concerning overlying layers in LOI value (6.3%) and a drop in calcium carbonate content (to 2.3%) is observed. The silty loam that occurs there also has a lower pH and reduced water content in comparison to the overlying ones. The lower-lying strata (1.44-1.54 m) have a density of about 0.94 g\(\cdot\)cm\({}^{-3}\), slightly alkaline pH\({}_{\mathrm{KCl}}\) (7.13-7.36), and a low LOI (2.1-2.8%) and carbonate content (4.0-7.1%) (Table 1). At the depth of 1.54-2.00 m, weathered limestone rock debris appears again and the density, pH and LOI increase slightly. However, a large increase (to about 75%) in the carbonate content is observed in this stratum in relation to the overlying soil.  
The Lgota II profile, sampled from the middle height of the heap, is 0.82 m deep. As in the case of the previous profile, a 7-cm-thick humic, dark layer appears on the surface. Its bulk density is about 0.5 g\(\cdot\)cm\({}^{-3}\) and it is characterised by pH\({}_{\mathrm{KCl}}\) from 5.1 to 5.8, relatively high water content (about 50%) and a LOI value of about 50%. The carbonate content is relatively low and varies from 5.7 to 32.9%. In the underlying brown layer, at a depth from 0.07 to 0.57 m, there are some fragments of carbonate rock up to a few cm in diameter. Carbonate enrichment is reflected by the increase in pHKCl to 6.7 and carbonate content reaching 82%. The bulk density reaching 1.48 g\(\cdot\)cm\({}^{-3}\) is much higher than in the overlying strata, while a water content of about 25% and the LOI value of about 3% is much lower. The part of the core from the depth 0.57 to 0.82 cm is characterised by high density (to 1.74 g\(\cdot\)cm\({}^{-3}\)) dark brown silts with a low concentration of carbonates (about 4%) and organic matter (to 0.2%) (Table 1).  
The Lgota III profile, dug to a depth 0.4 m, was located 3 m from the previous profile. The dark coloured humus layer on the profile top is about 0.1 m thick but the values of the organic matter decrease from 75.3% to 26.2% and pH\({}_{\mathrm{KCl}}\) from 4.6 to 6.1 with depth. Conversely, the concentration of carbonates is relatively low and changes from 4.5% to 44.3%. Below this level, at the depth 0.1-0.3 m, there is a reddish-brown sandy loam layer with a relatively high bulk density (up to 1.86 g\(\cdot\)cm\({}^{-3}\)),which is slightly acidic and contain a low concentration of organic matter (about 2.5%) and carbonate content (on average, 3.5%). In the deepest part of the profile (0.3-0.4 m), there is a stratum with fragments of crushed rock and the highest concentration of carbonates in the whole profile (70.3%) and pH\({}_{\text{KCI}}\) (6.7) (Table 1).