Effectiveness of transient electromagnetic method (TEM) used for the localization of Pb–Zn ore bodies at the Cho Don deposit, province Bac Can, North Vietnam is appraised based on the modelling processes results. Conductive Pb–Zn ore bodies hosted in high-resistive limestone are in good conditions for the application of the TEM. The modelling process relays on the calculation of the voltage decay in time domain formed from the induced magnetic field diffusing into the study medium, when a pulse current with a given frequency is flowing in a transmitting loop coil. The model results show that the power current of 1 A transmitted from the coils with 100 or 400 m of size is effective for localization of the Zn–Pb ore bodies. However, the resolution and penetration depth of the TEM with a coil of L = 100 m is better and shorter in comparison with those in the case using the coil L = 400 m.
Opisano zawartość metali ciężkich (Zn, Cd, Pb) w materiale roślinnym porastającym osadniki odpadów flotacyjnych. Badania wykonano dla dziesięciu gatunków roślin, biorąc pod uwagę ich części nadziemne. Zbadano wpływ podłoża wzbogaconego w metale ciężkie na ich zawartość w roślinności rosnącej na nim przez porównanie z próbkami pobranymi w kompleksie leśnym Bytomia.
EN
The content of heavy metals (Zn, Cd, Pb) in the plants overgrowing the settling ponds of the flotation wastes is described. The investigations have been made for overground parts of ten kinds of plants. The influence of the basement soil, enriched with heavy metals, on the content of the last in the plants which overgrow the soil has been studied by comparison with the samples taken from the forest-complex of Bytom.
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