Currently, Uzbekistan is in the process of legislation modernization, primarily in matters of labor protection and industrial safety. Modernization consists in the transition from a previously existing ineffective system focused on compensation payments to a modern system based on preventive approaches, which imply continuous improvement of work conditions. The aim of this work is to analyze the legislation in the field of labor protection management, obliging employers to proceed to occupational risks assessment and their management, as well as the assessment of occupational risks for miners, working under the influence of harmful and dangerous production factors during gold mining in the quarry, and the development of measures to reduce them. The possible reasons for the discrepancy with the stated requirements of the physical factors of the miners working environment when performing work in gold mining quarries are analyzed. It has been established that professional risks for personnel are classified as high and medium and it is necessary to carry out organizational and technical measures to minimize them.

For over a century now, the mining industry has been using cyanides for gold and silver recovery. Cyanides are highly toxic for human beings, animals, and aquatic organisms. The available physical and chemical methods of wastewater treatment are cost-ineffective. Certain microorganisms are capable of use cyanides as sources of carbon and nitrogen and turn those into ammonia and carbonate. Some plants are also efficient for the processes of cyanides destruction. Phytoremediation of cyanides may be efficient, cost-effective, environmentally friendly, and be used as an attractive alternative to traditional physical and chemical processes. This article considers the capability of aquatic plants, which grow in the valley of Zerafshan River on the territory of Uzbekistan, to dispose of cyanides and recover the cyanides-contaminated tailings of Navoi Mining & Metallurgical Combinat. Such aspects as the mechanisms of enzymatic detoxification of cyanides by aquatic plants and microorganisms are discussed. The most promising plants to be bedded in the tailings dump are selected.

Technological (production, operational and repair) risks come to the fore, minimizing which requires optimization of the work of structural units responsible for a reasonable assessment of the technical condition, maintenance and repair of facilities, timely renewal of production facilities with minimization of wear and tear of equipment, which is a risk factor in the failure of the gas transmission system. In addition, based on the noted features of gas transportation enterprises, in the risk management block, logistics risks, safety risks, environmental, social and (in a certain aspect) financial risks should play a significant role. Objectively, in order to establish an acceptable range of risks, it is necessary to collect statistical data on the occurrence of risk factors for the foreseeable period in order to leave for constant monitoring those risk factors that appear regularly in the gas transmission system. The construction and operation of gas pipelines play an important role in the reasonable and technical transportation of gaseous substances. Noteworthy, algorithm for calculating the proposed medium pressure gas pipeline was developed, accordingly, in this research, the gas flow area was determined. The results showed that based on the calculations of underground average pressure of polyethylene pipes, the average gas pressure was 5,733 Pa, withstands pressure was up to 8009.7 Pa, withstands stress on the pipe wall was up to 0.024 MPa, and emission loss was 3964.4 m3 when there was an accident.

The ever-increasing volumes of gold mining in the Republic of Uzbekistan requires an increase in the cost of water resources. However, the subdivisions of the Navoi MMC are located in the arid, lowwater areas with high (40–80 %) and extreme (more than 80 %) water shortages. Therefore, the problem of water supply, water disposal and improvement of the closed water circulation system with the use of innovative biotechnological solutions is acute for the enterprise. The purpose of this work is to summarize current data on the use of wastewater bioremediation technologies at mining enterprises and to assess the prospects for using this technology by Navoi Mining and Metallurgical Company. The article summarizes the data on the use of bioremediation at mining enterprises in Russia and other countries and data obtained from our own experimental studies of the cleansing functions of plants in Uzbekistan. These studies were carried out under the laboratory modeling conditions using wastewater from tailing ponds GMZ-2 and GMZ-3 NMMC. The cleansing functions of the plants of the Zarafshan river valley were studied: eichornia, pistia, azoles and duckweed. It was found that eichornia has the highest cleansing potential: due to the high activity of the cyanidutilizing enzyme beta-cyanoalanine synthase, it accumulates metals and metabolizes cyanides. Pistia and azola have proven to be tolerant to high salinity levels and need to be adapted by adding organic matter, including sheep manure. The next stage is semi-industrial testing in a tailing dump and development of technical regulations.