Daouda, Keita та Pozdnyakov, Valery та Bah, Ibrahima (2020) STATISTICAL ANALYSIS OF EXPERIMENTAL DATA ON THE INDICES OF OPERATION OF THE LOADING UNITS OF THE BAUXITE COMPANY OF GUINEA (CBG). Topical scientific researches into resource-saving technologies of mineral mining and processing. с. 226-243.

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Title in English

STATISTICAL ANALYSIS OF EXPERIMENTAL DATA ON THE INDICES OF OPERATION OF THE LOADING UNITS OF THE BAUXITE COMPANY OF GUINEA (CBG)

English abstract

The natural resources, the technical level and the value of a nation's human re-sources largely determine its economic development. The proper management of these resources requires reliable information on their nature, importance and conditions of existence in order to determine the most ration-al methods of exploitation. In the specific case of the Republic of Guinea, bauxite is of prime importance because of its immense resources which can be exploited according to current tech-nology. It is the country's largest mineral resource and the main source of foreign exchange. Guinea is the world's second largest producer of bauxite after Australia, with an estimated bauxite potential of over 40 billion tons, which would ensure centuries of production at the current rate of exploitation. The bauxite deposits in the Republic of Guinea constitute a special geological phenomenon, which some have described as a "geological scandal". The Bauxite Company of Guinea, which is the largest mining company, respon-sible for about 60% of the country's exports, exploits the exceptionally high-grade bauxite reserves of the Boke region. In recent years, the company's profit has de-creased as a result of an increase in financial charges related to investments in the replacement and modernization of production machinery and equipment. Although the bauxite reserves of the region of Boke are no longer of the exceptional quality of the past, the quantity assessed on the site, still allows it to envisage a significant increase in production; however, each prospect of increase in production, necessarily entails a new investment. This is a major handicap and raises questions: "How do we increase production with less expenditure?" This is why, despite the large number of equipment and resources involved in mining, the CBG is still faced with problems of efficiency in order to increase its production in order to meet the demands of its customers. In order to find a solution to this thorny problem, a systematic analysis of all the technical and natural factors affecting the efficiency of production equipment such as (availability factor, utilization factor defined and loading factor of the bucket of excavators having a direct influence on the cycle time; Therefore, after evaluation of the current parameters of the operations by the sta-tistical method to obtain their theoretical characteristics, these values are compared with their practical average or experimental values in order to estimate the efficiency of the operations. As a result of this comparison, we found on average per day and per piece of equipment lost time deviations from the planned value. By relating these losses of time in the calculation of the technical production parameters, we have found a sig-nificant production margin; because when one proceeds to the reduction of the lost time of the cargo and transport units, one certainly ensures an improvement in the rate of use of the equipment. This ensures an average cycle of 28 minutes per race and per truck for 16 races per shift; an actual production margin of 30% of its planned value for the study period

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