Features of environmental assessment at ore gold deposits in the Irkutsk region and Yakutia

In the course of the work carried out, specific factors affecting the ecological state characteristic of gold deposits in the mountain landscapes of Transbaikalia and north-eastern Siberia were identified and analyzed. The main specific factors of the ecological assessment of the territory of gold deposits are the fact of the presence of geochemical anomalies and scattering halos, the presence of galeafel dumps in riverbeds in the area of the deposit, as well as a shortened soil profile. Ecological assessment of territories with the presence of geochemical anomalies and dispersion halos is carried out with the establishment of background values of elements by average content with further calculation of the total pollution index (Zc) according to the established gradation. The samples taken at the ore gold sites were also analyzed and the predominant contaminant, arsenic, was identified. The assessment of territories with the presence of galeafel dumps is based on the degree of their overgrowth and the scale of localization. These parameters are successfully established using multispectral satellite images, for example, based on the normalized relative vegetation index (NDVI). The shortened soil profile in the areas of the studied deposits is associated with their climatic zones and geological structure. The soils of their territories have low power, high acidity, low content of organic and mineral substances and high crushed stone. All these factors determine the low natural fertility of soils. Such soils are not recommended for removal and are unsuitable for biological reclamation.

Abaturova I. V., Petrova I. G., Boltyrov V. B., Klokova Ju. V. Features of environmental assessment at ore gold deposits in the Irkutsk region and Yakutia. MIAB. Mining Inf. Anal. Bull. 2022;(11-1):5—17. [In Russ]. DOI: 10.25018/0236_1493_2022_111_0_5.

Abaturova I. V.¹, Dr. Sci. (Geol. Mineral.), professor, https://orcid.org/0000-0003-4829-3204, е-mail: gingeo@mail.ru;
Petrova I. G.¹, Cand. Sci. (Geol. Mineral.), docent, https://orcid.org/0000-0003-0021-0051, е-mail: igp@mail.ru;
Boltyrov V. B.¹, Dr. Sci. (Geol. Mineral.), professor, https://orcid.org/0000-0001-8049-6162, e-mail: boltyrov34@mail.ru;
Klokova Ju. V.¹, assistant, https://orcid.org/0000-0002-1871-420X, e-mail: klokova.julia@mail.ru;
¹ Ural State Mining University, Yekaterinburg, 620144, Russia.

Klokova Ju. V, e-mail: klokova.julia@mail.ru.

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