• Bilal BOUMAZA
• Tatyana Vladimirovna CHEKUSHINA

B. Boumaza, T. V. Chekushina / News of the Ural State Mining University. 2021. Issue 1(61), pp. 7-16

https://doi.org/10.21440/2307-2091-2021-1-7-16

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Research relevance. Phosphate mining activities are one of the main sources of contamination by heavy metals since they harmfully affect the soil and lead to the degradation of the ecosphere.
Research aim. This study aims at characterizing and evaluating the metallic contamination of soils in the vicinity of the Djebel Onk mine in the town of Bir El Ater (Wilaya of Tébessa) in eastern Algeria, and particularly focusing on estimating the spatial variability of this contamination and the extent of the contaminated area.
Methodology. The physicochemical characteristic (pH) was determined by pH-meter, whereas AAS was used for the determination of heavy metals (Pb, Cu, Zn, Cd) in the examined soil
Research results. The results reveal that soils that are close to the mine site studied and even those that are far away are heavily contaminated with heavy metals — lead (Pb), zinc (Zn), copper (Cu) and cadmium (Cd); the results also point out to a high variability of concentrations not only between sampling sites but also within the same mine site. The analysed soil pollution index is generally high even for soils sampled downstream more than 30 km from the mine site, whereas it is extremely high on the surface of the tailings slopes, underlining the fact that tailings are considered perennial sources of heavy metal contamination in their current state.
Conclusion. The unhealthy area affected by metal pollution from mining sites in the Djebel Onk is very large as a result of the dispersion, by wind and water transport, of residual pollutants from the mine wastes abandoned on site. Remediation measures must be put into place to immobilize the pollutants and limit their spread to the environment

Keywords: Soil contamination, Algeria, heavy metals, phosphate mine, pollution index.

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P. S. Kozlov / News of the Ural State Mining University. 2021. Issue 1(61), pp. 25-32

https://doi.org/10.21440/2307-2091-2021-1-25-32

Relevance. When mapping the vast areas of the Precambrian polymetamorphic complexes in the North Yenisei Ridge,
there is a problem of metamorphism interpretation and phasing of geological development of a particular area along
with thrust tectonics. The solution of these issues is also of great importance for the purposes of areas delineation of
metamorphic rocks that are favorable for the detection of high-alumina (andalusite, kyanite, sillimanite) schists.
Purpose of the work: to substantiate and itemize some geological prospecting, mineralogical and petrological indicator
criteria for the development of high-alumina garnet-kyanite-staurolite blastomylonites of dislocation metamorphism
formed by andalusite-bearing rocks of regional metamorphism.
Research methodology: detailed mapping of structural-metamorphic zoning of dislocation (collisional) metamorphism
in the Mayakon key area with sampling of polymetamorphic rocks for petrographic studies of mineral parageneses.
Investigation of polished thin sections of polymetamorphic rocks by microprobe analysis with elucidation of minerals
zoning, their chemical composition, calculation of the Р–Т paths of metamorphism and determination of the absolute
age of blastomylonite formation based on the 40Ar/39Ar dating of biotite. Analysis and generalization of the results
obtained for the Mayakon area and their comparison with other key areas of the North Yenisei Ridge.
Results. At the Mayakon potential area, a progressive metamorphic zoning of kyanite-bearing blastomylonites
has been identified, and the transitional I, outer II, middle III, and inner zones are determined as the dislocation
metamorphism intensifies towards the Panimba thrust fault. Based on the compositions of garnets, biotite, and
plagioclase, the P–T paths of the early regional metamorphism of andalusite-sillimanite type and late local kyanitesillimanite
type were calculated. A list of geological prospecting, petrological and isotope-geochronological criteria
for recognizing blastomylonites among rocks of regional metamorphism in thrust zones has been substantiated and
itemized.
Conclusions. Method of polymetamorphism reconstruction in the North Yenisei Ridge shows that tectonic inversion
conditions took place in the Neoproterozoic, in the late Tonian era (~850 Ma ago In terms of occurrences, they are
related to the final stage of the Grenville orogeny (1.1–0.85 Ga). The formation of blastomylonites of dislocation
(collisional) metamorphism by metapelites of regional metamorphism in thrust zones is accompanied by an increase
in the number of mineral phases and leads to a reduction in usable space of high-alumina andalusite schists.

Keywords: polymetamorphic complexes, Al2SiO5 polymorphs, blastomylonites, dislocation metamorphism, Mayakon,
North Yenisei Ridge.

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A. Lamamra et al / News of the Ural State Mining University. 2021. Issue 1(61), pp. 17-24

https://doi.org/10.21440/2307-2091-2021-1-17-24

Reserch relaevance. Most ground movements are generally due to rock instability, this natural phenomenon poses a risk to humanity. The properties of the rock mass directly influence the type of movement especially in underground structures.
Research aim. Our goal is to characterize and classify the rock mass of diatomite from the sig mine using geomechanical classification systems such as the RQD and RMR in order to determine the quality of the rocks in the sig mine Western Algeria from the determination of the physical and mechanical properties.
Methodology. In this article, the characterization analysis of the diatomite rock mass of the sig mine was carried out. First, determinations of the physical properties and carried out the triaxial test to determine the mechanical properties (young’s modulus, the friction angle, the dilatancy angle, the cohesion, the poisson’s ratio). Secondly to classify the deposit and give a recommendation to avoid stability problems.
Research results. The results from physical and mechanical analyzes, it can be said that the nature of the rock present in the diatomite (underground mine) does not have enough resistance.
Conclusion. Our study definitively proves that the rock mass of sig diatomite is of very low quality and it will be very dangerous for the underground mining work of the mine especially in places where the mineralized layer is very deep. And we suggest to replace the mining technique room and pillar currently used in the diatomite mine and put another mining method which includes roof support system to ensure the safety both of the miners and the equipment.

Keywords: Diatomite, RQD, RMR, triaxial test, physical and mechanical analysis.

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A. J. Rodriguez Linares, E. V. Karelina/ News of the Ural State Mining University. 2021. Issue 1(61), pp. 33-38

https://doi.org/10.21440/2307-2091-2021-1-33-38

Relevance of the work. Quantifying these oil reserves allows Venezuela to lead the ranking as the country with the
largest oil reserves worldwide
Purpose of the work. Is related to the need of quantification in the recoverable oil reserves in the field of Husepin
(Monagas state, Venezuela) for the oil industry.
The methodology of the research. The La Pica 01 Field is made up of 509 wells, of which 49 wells were used to elaborate
the correlations, since they have spontaneous potential and resistivity curves. For each well, the tops and bases of the
units were determined by analyzing the behavior of the electrical responses of each of the sands, applying the basic
concepts of stratigraphy, as well as a detailed compilation of all the information that corresponds to the wells that form
part of the study to obtain a standard record that contains all the favorable data and be able to carry out the correlations.
Research results. In the S6 sand, 4 oil deposits were found and an Original Oil In Place of 15,875.32 thousands of
normal barrels and recoverable reserves of 2,857. 5576 thousands of normal barrels were estimated. For S8 sand, 5 oil
fields were defined and an Original Oil In Place of 25,940.86 thousands of normal barrels and recoverable reserves of
4,669. 3548 thousands of normal barrels were estimated. Original Oil In Place was not calculated in the S7 sand because
it has no deposits.
Recommendations. Review the production history and verify which wells can be re-incorporated into an oil extraction
plan and Submit the reserves of the study fields to the Ministry of Popular Power for Energy and Petroleum (MENPET)
taking into account the results obtained in this investigation.
Conclusions. 4 oil deposits were found in the S6 sand and 5 oil deposits were found in the S8 sand and each of them were
with stratigraphic limits, structural limits and fluid contact. No oil deposits were found in the S7 sand, although records
have been taken in the northwest of the field show thicknesses of ANP at this stratigraphic level.
Keywords: oil reserves, Orinoco basin, Sigmoilina zone, well, deposit.

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