The velocity of roof deflection as an indicator of underground workings stability – Case study from polish deep copper mines

2021 ◽  
Vol 143 ◽  
pp. 104717
Author(s):  
Lech Stolecki ◽  
Wiesław Grzebyk
Keyword(s):  
Copper Mines ◽  
Underground Workings

scholarly journals The Influence of Time on the Density and Detonation Velocity of Bulk Emulsion Explosives – a Case Study from Polish Copper Mines

2019 ◽  
Vol 16 (2) ◽  
pp. 245-258 ◽  
Author(s):  
Piotr Mertuszka ◽  
Krzysztof Fuławka ◽  
Mateusz Pytlik ◽  
Jarosław Wincenciak ◽  
Andrzej Wawryszewicz
Keyword(s):  
Detonation Velocity ◽  
Emulsion Explosives ◽  
Copper Mines

scholarly journals Assessment of the Errors in the Transmission of the Orientation and Cartographic System from the Surface to an Underground Mine

2018 ◽  
Author(s):  
Lluís Sanmiquel ◽  
Marc Bascompta ◽  
Josep M. Rossell
Keyword(s):  
Technological Progress ◽  
Mining Industry ◽  
Mine Ventilation ◽  
Base Line ◽  
Sources Of Error ◽  
Underground Infrastructure ◽  
Important Challenge ◽  
Underground Workings ◽  
Different Sources

A proper transmission of the orientation between surface and underground workings, by means of vertical shafts, is an important challenge in the mining industry, especially when the mine exceeds 200 meters deep. In fact, this study is developed in a mine located to 700 meters deep. Likewise, this paper assesses the accuracy of this operation, in a case study, using the two shafts plumbing and gyroscope methods in order to compare and analyse the planimetric displacement of the base line due to different source of errors in each one. Upsides and downsides of both methods are analysed in the paper. Some disadvantages in each method have been reduced thanks to the technological progress, especially in the two shaft plumbing method. The different sources of error that affect the measures are thoroughly analysed in the study with the aim to compensate them and achieve the required precision for an underground infrastructure. Mine ventilation has been found as one of the most important sources of error in the plumbing method due to intake and return airflow. In this direction, the paper unfolds some measures to reduce the ventilation influence and details a compensation method to reduce ventilation errors.

scholarly journals Monitoring of the stability of underground workings in Polish copper mines conditions

2018 ◽  
Vol 29 ◽  
pp. 00008 ◽  
Author(s):  
Krzysztof Fuławka ◽  
Piotr Mertuszka ◽  
Witold Pytel
Keyword(s):  
Fall Prevention ◽  
Underground Mines ◽  
Observation Methods ◽  
Number Of Factors ◽  
Copper Mines ◽  
Sudden Release ◽  
Roof Falls ◽  
Underground Workings ◽  
The Stability ◽  
Roof Strata

One of the problems associated with the excavation of deposit in underground mines is the local disturbance in a state of unstable equilibrium results in the sudden release of energy, mainly in the form of roof falls. The scale and intensity of this type of events depends on a number of factors. To minimize the risk of instability occurrence, continuous observations of the roof strata condition are recommended. Different roof strata observation methods used in the Polish copper mines have been analysed within the framework of presented paper. In addition, selected prospective methods, which could significantly increase efficiency of rock fall prevention are presented.

‘Good Lawyers but Poor Workers’: Recruited Angolan Labour in the Copper Mines of Katanga, 1917–1921

1977 ◽  
Vol 18 (2) ◽  
pp. 237-259 ◽  
Author(s):  
Charles Perrings
Keyword(s):  
Political Economy ◽  
Short Term ◽  
Unskilled Labour ◽  
Copper Mines ◽  
Worker Behaviour ◽  
Robert Williams

Between 1917 and 1921 Robert Williams and Company recruited labour from the Moxico Province of Angola for work in the Katanga copper mines of the Union Minière. The episode is one of the better documented in a period in which comparable recruiting operations were the mainstay of the industry, and provides a case study that is also a vehicle for the analysis of the significance of recruitment both as an instrument of industrial strategy and a determinant of worker behaviour. It is argued that recruitment is characteristic of a phase in the development of the colonial political economy marked by the use of highly unskilled labour intensive techniques of production in the dominant industry. It is a mechanism designed specifically to service such techniques through the regulation of the induced supply of short-term, unskilled labour. It is further argued that it is such regulation—realized as coercion—that gives recruitment its particularity as a determinant of worker behaviour, and this paper seeks to identify from the Angolan case the precise implications which this had for the workers themselves.

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