Since 2003 the company has held a TÜV NORD quality management certificate in compliance with the PN-EN ISO 9001:2001 standard. It assures high service and product quality, and guarantees that customer expectations and needs are met.
In 2007 ZOK implemented an integrated quality management, environmental protection and work safety system in compliance with the PN-EN ISO 9001:2001, PN-EN ISO 14001:2005 and PN-EN ISO 18001:2004 standards.
The company employs underground and surface workers. Its engineering and technical staff is made up of experienced people qualified in mine ventilation, drilling and mechanical works.
The total number of employees is around 600.

ZOK carries out complete demethanation from rock mass under different geological conditions in more than 10 coal mines, both in order to eliminate methane-related safety hazards in active workings and to capture methane from worked-out deposit parts and from closed-down mines so as to remove all methane from them and to protect post-mining land.
The company captures around 180 million cubic metres of methane annually. Mine methane drainage contributes to reducing methane emissions to the atmosphere while the use of methane for heating, industrial and technological processes contributes to reducing gas emissions from coal combustion.
At present, around 70% of methane captured by ZOK is utilised in technological processes.
The company drills drainage boreholes to drain methane from rock mass.
Apart from work connected with demethanation from rock mass, ZOK also drills other boreholes: water drainage boreholes, technical boreholes and research boreholes up to 800 meters deep. Additionally, ZOK drills large-diameter boreholes between mine levels of up to 1,200 millimetres in diameter and up to 200 meters deep.
ZOK is a scientific and research unit authorised by the President of the State Mining Authority to perform expert’s tasks in the area of methane-related hazards in hard coal mines.
In this capacity, the company:
- conducts research to determine methane storage capacity of coal seams,
- makes absolute methane content predictions for mine workings,
- assesses methane hazard and classifies coal seams or their parts into respective hazard categories,
- sets principles for classifying workings in methane fields in underground mines into individual explosion hazard categories.