Bezpieczeństwo Pracy i Ochrona Środowiska w Górnictwie Number 01/2018

The construction of the Siedlec-Moszczenica Salt Mine began in the 1970s. Up to 1994, excavations measuring approx. 25 km in length were drilled and their volume was approx. 250,000 m³. Between 1988-1994, i.e. the period during which the mine was operational, approx. 1.75 million tonnes of salt was mined, which is almost 1% of total deposit resources. After 1989, the coal lost its economic basis in terms of mining salt, and the idea of using its excavations as natural gas storage locations turned out to be uneconomical, which led to the decision to decommission the mine, the process of which began in November 2011. Instead of using sand burying, the analysis of decommissioning costs offered the possibility of using a self-setting mixture based on salt rubble, which is obtained from the reconstruction of historic Bochnia Salt Mine excavations. Brine supplied naturally to the historic Bochnia Salt Mine will be used to fill inactive mining excavations of the Siedlec-Moszczenica Salt Mine, which is being decommissioned. Brine will be pumped through a pipeline installed in the shaft, and if the pipeline blocks, brine will be pumped through a drain hole drilled for this purpose. The adopted method for decommissioning the Siedlec-Moszczenica Salt Mine excavation ensures that the salt deposit is secured, the decommissioning costs, as well as the costs of decommissioning of a non-historic part of the Bochnia Salt Mine and the running costs of maintaining its excavations are optimised, which, therefore, results in considerable savings for the Treasury.

In 2012, Prairie Mining began a number of drillings in the Lublin Coal Basin in order to gather data to estimate the possibility of building a modern hard coal mine adjacent to the Bogdanka Coal Mine. The obtained data enabled the preparation of geological documentation of the "Lublin" deposit and its adaptation to the JORC code requirements. On this basis, a scoping study was developed, followed by a pre-feasibility study, which both assessed the construction of a new mine in the Lublin Coal Basin to be highly profitable. In 2016, the company drew up a deposit development plan for the designed Jan Karski mine. Before the plan was drawn up, the investment concept had been developed in cooperation with Golder Associates and Royal Haskoning, and the mining and geological conditions in British Coal mines and the Bogdanka Coal Mine had been analysed in order to make sure the use of independent rock bolting would be suitable in the Lublin Coal Basin. It was found that the mining and geological conditions in the Lublin Coal Basin do not generally differ from the conditions in British Coal mines, and the values of geomechanical parameters of rocks meet the requirements of the regulations concerning the use of independent rock bolting. However, the use of rock bolting requires the evaluation of the direction of primary stresses in the Lublin Coal Basin and the proper position of longwalls relative to these stresses, including the use of support pillars between longwalls. The attempts to construct excavations with independent rock bolting, which were carried out in the Bogdanka Coal Mine between 1994-1997, confirm the indicated conclusions and observations. Using the available publications about the Bogdanka Coal Mine and Golder Associates experience, the size of support pillars was calculated and the basic requirements for safe implementation of the extraction process using longwall roadways supported by independent rock bolting in the Lublin Coal Basin were estimated. In this respect, the construction of the Jan Karski mine is highly profitable and justifiable from the point of view of business.

During accidents electricity can cause dangerous pathological effects. The most dangerous outcome of electric shock is heart arrest. Hears arrest is life threatening  condition that is also known as the beginning of dying process. The most vunerable for hypoxia are brain cells because of its dependency on glucose and oxygen. Lack od oxygen leads to biochemical changes that result in oxygen and glucose deficiency, releasing od adenosine and local vasodilatation. As soon as the reservoir of oxygen in blood is exploited the first signs of dying begin to show.