Mineralogical justification for potentiality of producing marketable hematite products

Hematite quartzites are a product of weathering of magnetite quartzites, which make up the ferruginous horizons of deposits of the Precambrian banded-iron formation. They occur all over the planet. The largest deposits are found in the iron-producing areas and basins of Central Kazakhstan, the Kursk magnetic anomaly, the Karelian-Kola region, Western Australia, Southeastern India, Brazil, the United States, and Canada. The geological and mineralogical issues of hematite quartzites as raw materials for producing concentrate and sinter ore have been studied most deeply and comprehensively for the deposits of the Kryvyi Rih basin and Central Kazakhstan. However, when developing an effective scheme for producing high-quality metallurgical raw materials, the mineralogical features of hematite ores have been taken into account insufficiently. The aim of the authors of the present work was to study the localization, structure of deposits and mineral composition of hematite quartzites as raw materials for sinter ore and concentrate production. Data from geological observations and mineralogical studies were used as source material. Proven geological, mineralogical, petrochemical methods were used. In accordance with the obtained results, the hematite quartzites are composed of ore-forming (quartz, hematite) and secondary (relict and newly formed) minerals. The total content of the hematite and quartz exceeds 90 mass %. The peculiarity of Ushkatyn III deposit ores is the high content of manganese oxides. The depth of distribution of the weathering crust composed of hematite quartzites varies from 200 to 1000 m. The hematite quartzites’ bodies are characterized by a zonal structure. Their central parts are represented by martite-micaceous hematite, micaceous hematite- martite quartzites; intermediate ones by martite quartzites; peripheral parts – by dispersed hematite-martite, kaolinite-martite-dispersed hematite quartzites. The horizons differ in the quantitative ratio of these varieties. The quantitative ratio of mineral varieties of hematite quartzites, morphology of individuals and aggregates of ore-forming and secondary minerals, their chemical composition and physical properties must be taken into account when developing the optimal technology for the production of high-quality hematite concentrate.

Innovations in Management of Banks Deposit Portfolio: Structure of Customer Deposit

The economic and statistical analysis of the bank's deposit portfolio by the structure of deposits has been performed. An algorithm for grouping deposits by type of client, amount, maturity, and interest rate is proposed and tested. A technique is proposed for analyzing the influence of the type of forming factors: the amount, term, and interest rate on the change in the number of dividends on a bank deposit. The influence of each type of deposit on the overall increase in interest payments is determined. The purpose of the article is to improve the methodological approach to the effective management of the bank's deposit portfolio using the economic and statistical analysis of the structure of deposits. A study of the literature shows that insufficient attention is paid to the formation of an optimal deposit portfolio of the bank. The relevance of the article lies in the need to use the mathematical apparatus to optimize the process of managing the borrowed funds of customers. The tendency of changes in the amounts of balances, volumes of inflow, and subsidence of deposits of corporate clients and individuals in the bank is analyses. The methodology for grouping deposits by amounts, interest rates, and investment terms has been improved, which allows structural positioning changes in the total amount of the bank's deposit portfolio. A technique is proposed for studying the influence of factors on the structure of deposits in a bank. The methodology of index factor analysis has been improved to study the structure of deposits in the bank. For the analysis of cash flows, the average storage period, and average deposit balances for a certain period are determined. The index of the average duration of the use of a variable composition deposit is calculated. The economic effect for the bank from increasing the terms of attracting financial resources is calculated. A set of indicators has been proposed for assessing the effectiveness of managing customer funds raised. The study is based on a combination of statistical and economic-mathematical methods of analysis, a system-structural approach (systematization, grouping and ranking, analysis of time series, and scientific abstraction). Presented various marketing tricks that bank depositors may meet. The developed methodological provisions of a statistical study of the structure of deposits can be used in modeling and forecasting the results of financial institutions. Practical recommendations allow us to give an objective assessment of the state of the resource base of the bank in terms of the effective management of funds of individuals and corporate clients. Keywords: analysis, bank, monetary resources, deposit, efficiency, customers, portfolio, interest, amount, term, management.

Features of vegetation succession in the loess quarry of the brick factory in Novyi Tik village (Rivne region, Ukraine)

Termination of quarries is the reason for the settlement of pioneer plants, which exploit "free" areas of soil in a certain sequence, called successions. The theoretical foundations of restorative plant successions in the quarries are still relatively poorly developed, although there is much empirical research on the subject. The object of our study is the quarry of a brick factory located in the eastern outskirts of the village. Novy Tik (Demydiv district, Rivne region) in the central part of Volyn height, 27 km south of Lutsk. Since 2008, when the brick factory ceased to function in the quarry, there has been a primary plant succession, which is now at a youth stage and is characterized by an increase in biodiversity. As of autumn 2019, 72 plants spices have been identified in the quarry, including 6 species of trees, 1 species of shrubs and 65 species of grasses. According to the results of the systematic analyze, the Asteraceae and Fabaceae families predominate. The prevailing ecological groups of plants in the quarry are determined: in relation to lighting prevail heliophytes; in relation to the thermal regime, the largestproportion is made up of temperate-warm climate species; in the vegetation cover at the present stage of succession, Central European species prevail. Based on the analysis of the population of plant associations and the appearance of interspecific and intraspecific competition, it is established that plant succession in the studied quarry is at a youth stage. Also, heterochrony and microzonal differentiation of succession processes in different parts of the quarry are found. The difference in the passage of succession stages depending on the features of the relief is taken as the basis for the quarry microzoning. It has been established that at the present stage of vegetation succession, the determining factor in the qualitative and quantitative composition of plant communities is abiotic quarry factors, especially morphology and relief dynamics and lithological-stratigraphic structure of deposits. The initial stage of soil succession was revealed, which became possible due to the accumulation of a significant amount of mortmass in recent years.

Using Multistaged Magnetic Survey and Excavation to Assess Community Settlement Organization: A Case Study from the Central Peninsular Gulf Coast of Florida

Integrating geophysical survey with the study of community settlement patterns can be challenging because of cultural and environmental factors including (1) site formation and house preservation, (2) the coordination of domestic tasks at extra-household scales, and (3) the survey environment of the study area. In this article, we present the results of a program of geophysical survey comprising magnetic susceptibility and magnetometry at Weeden Island (8Pi1)—a shell-bearing, wooded site with nearly pure sand soils on the Gulf Coast of Florida. Combining remote sensing techniques mitigated some of the challenges of surveying forested terrain while providing insight into community organization at a site with minimal preserved structural remains. Compared with previous traditional surveys of the area, the geophysical survey extended the recognized boundaries of occupational activity, provided additional definition to the spatial structure of deposits, and allowed us to identify specific domestic features. Excavations at each area of intensive occupation provided evidence about the organization of the domestic economy at the site and showed the potential of this approach to reveal significant patterns of community settlement.

Dynamics and deposition of sediment-bearing multi-pulsed flows and geological implication

ABSTRACT Previous studies on dilute, multi-pulsed, subaqueous saline flows have demonstrated that pulses will inevitably advect forwards to merge with the flow front. On the assumption that pulse merging occurs in natural-scale turbidity currents, it was suggested that multi-pulsed turbidites that display vertical cycles of coarsening and fining would transition laterally to single-pulsed, normally graded turbidites beyond the point of pulse merging. In this study, experiments of dilute, single- and multi-pulsed sediment-bearing flows (turbidity currents) are conducted to test the linkages between downstream flow evolution and associated deposit structure. Experimental data confirm that pulse merging occurs in laboratory-scale turbidity currents. However, only a weak correspondence was seen between longitudinal variations in the internal flow dynamics and the vertical structure of deposits; multi-pulsed deposits were documented, but transitioned to single-pulsed deposits before the pulse merging point. This early transition is attributed to rapid sedimentation-related depletion of the coarser-grained suspended fraction in the laboratory setting, whose absence may have prevented the distal development of multi-pulsed deposits; this factor complicates estimation of the transition point in natural-scale turbidite systems.

ESTIMATION OF PROPENSITY OF HYDROCARBON RAW MATERIALS TO FORMING DEPOSITS

The article deals with the problem of quantitative assessment of the propensity of hydrocarbon raw materials (distillate and residual fractions) to the formation of deposits under the influence of external factors. The review of applied technological reagents in the oil and gas industry at the stage of extraction, transportation, storage and processing of hydrocarbon raw materials, as well as methods for studying the composition and structure of deposits in equipment during the course of these technological processes is presented. The main factors influencing the process of deposit formation are highlighted. Step-by-step procedure of quantitative assessment of the propensity of hydrocarbon raw material to form deposits in the presence of various technological reagents is described. The scheme of the laboratory installation and the formula for calculating the amount of precipitate formed and for determining the convergence of the results are given.