Birth and Developing of Mongolian Geoscientist journal

Since the publication of the first issue of Mongolian Geoscientist, in October 1996, 25 years have passed and the journal has successfully evolved over a quarter of a century into a periodical publication well-known also outside the borders of Mongolia. Background and episodes of early publications were reviewed by Y.Takahashi, N.Ichinnorov, and S.Jargalan, who were members of the JICA-IGMR project. The present status of Mongolian Geoscientist is that of an internationally peer-reviewed, open-access journal, published by the School of Geology and Mining Engineering, Mongolian University of Science and Technology, with support from the Geological Society of Mongolia; managed by Editor-in-Chief B.Batkhishig, Consultant Editorial Board member O.Gerel, and Associate Editors B.Munkhtsengel, B.Altanzul, and Kh.Tseedulam.

Construction of a Multiplicative Model for Calculating the Volume of Production of Finished Products of a Mining Enterprise

The article is devoted to the issues of planning and budgeting of mining enterprises. External conditions (mining and geological, mining engineering, weather) have a significant impact on the volume of production of finished products and the amount of conditionally variable expenses of a mining enterprise. A different combination of these conditions during a calendar year leads to a change in the volume of production of finished products per unit of time, which creates uncertainty and complicates the planning and budgeting process. The paper proposes a method for calculating the planned volume of production of finished products, taking into account various external conditions, the limitations (limits) that should be taken into account when calculating the volume of production are disclosed. The methodology is developed taking into account the peculiarities of the technological process of production of finished products (fractional crushed stone) of a mining enterprise. Methodological tools of the research: analysis of statistical data on the industry and individual mining enterprises, analysis of the practical activities of mining enterprises. The factors that have a significant impact on the volume of production of finished products in the mining industry are considered. A three-factor multiplicative model is constructed that allows taking into account the influence of mining, geological, mining and weather conditions on the volume of production of finished products of a mining enterprise.

Proposal for academic evaluation at the School of Mining Engineering due to the Covid-19 effect

This research proposes an alternative to the academic evaluation system, in the School of Engineering in Mines, of the University of Azuay (Ecuador), due to the Covid-19 pandemic, declared in 2020 by the WHO. Initially, a system was established, in which two components are established -contribution and final-, based on a rating of 50 points. The first component, over 30 points, qualifies aspects of attendance, compliance and performance. The final component, over 20 points, establishes an asynchronous evaluation, in which the teacher applies various assessment instruments and finally a synchronous evaluation. After two periods with this system, the research was carried out with a universe of 90 students, based on surveys, focus groups and using matrices, boolean algebra and sets, changes were proposed in the way of evaluating. The results are interesting and involve a pedagogical mediation, so it must be considered in the corresponding entities. Keywords: Evaluation, qualification, mining, pandemic. References [1]Situation report-70, 2020, World Health Organization, Geneva, Switzerland. [2]Acuerdo Ministerial No. 126, publicado en el Suplemento del Registro Oficial Nº 160 de 12 de marzo de 2020, MSP, Ecuador. [3]Organización de la Naciones Unidas para la Educación, la Ciencia y la Cultura y la Oficina Regional de Educación para América Latina y el Caribe. Sistemas educativos de América Latina en respuesta a la Covid-19: Continuidad educativa y evaluación., 17. Santiago de Chile, 2020. [4]E. Diez-Gutiérrez and K. Gajardo-Espinoza, “Educar y Evaluar en Tiempos de Coronavirus: la situación en España”, Multidisciplinary Journal of Educational Research, vol. 10, no. 2, junio de 2020. doi: 10.4471/remie.2020.5604. [5]Universidad del Azuay, Resolución 1109, Aprobación del sistema de evaluación excepcional para el período de la pandemia COVID-19, 2020. [6]P. Feijoo Calle and G. Román Celi, “El Trapecio lógico en el proceso enseñanza-aprendizaje universitario: Una propuesta metodológica”, UCT, vol. 23, no. 93, agosto de 2019. [7]J. Sandí Delgado and M. Cruz Alvarado, “Propuesta metodológica de enseñanza y aprendizaje para innovar la educación superior”, InterSedes, vol. 17, no. 36, noviembre de 2016. https://dx.doi.org/10.15517/isucr.v17i36.27100. [8]M. Sánchez. Diseño de medios y recursos didácticos. México: Limusa, 2016. [9]F. Ciampolini. Didáctica Breve y Didáctica Global. Ecuador: Cooperazione Internazionale, 1991. [10]M. Sánchez and A. Martínez. Evaluación del y para el aprendizaje: instrumentos y estrategias. México: UNAM, 2020. [11]R. Grimaldi. Matemáticas Discreta y Combinatoria. México: Prentice Hall, 1998. [12]R. Johnsonbaugh. Matemáticas Discretas. México: Prentice Hall, 1997.

Study on the Creep Damage Characteristics of Shale under the Combined Action of Osmotic Pressure and Disturbance Load

In the in situ modified fluidized mining engineering, the surrounding rock of the shaft wall is prone to creep instability damage under the action of disturbance and seepage water pressure, which seriously affects the stability of the surrounding rock of the deep in situ modified fluidized mining. In order to study the nonlinear creep damage and fracture characteristics of deep rocks under the combined action of seepage water pressure and disturbance load, a self-developed rock perturbation creep test rig under the action of seepage water pressure was used, and shale was used as the rock sample. In the method of staged loading, the rock uniaxial compression perturbation creep test under static axial pressure, different perturbation frequencies, and different seepage water pressures was carried out, and the creep characteristics of shale under the combined action of perturbation and seepage were studied. The results show that with the increase of seepage water pressure, the creep failure time of the rock decreases, and the ultimate strain value increases; with the increase of the disturbance frequency, the creep failure mode of the rock gradually transitions from shear failure to tension failure. When water pressure and disturbance load exist at the same time, rock creep is more sensitive to seepage water pressure; based on experimental results, a shale perturbation creep damage model considering the influence of seepage water pressure and disturbance frequency is established, and the model is verified. The research results have important theoretical significance for guiding the wellbore stability control of in situ modified fluidized mining engineering.