| 1860 | | destription and geologic maps of the deposits in the report "Lignite deposits in the Šoštanj valley in lower Štajerska and its fossils" |
| 11.4.1875 | | drillig through the main lignite layer (Franc Mages) |
| 1885 | | start of underground coal production (Daniel pl. Lapp) |
| 1888 | | construction of the first shaft-Shaft "Rudolf" and "the Old Shaft", and first problems with methane |
| 1891 | | installation of the first conveyor in the Old Shaft |
| 1891 | | first railway connection between Velenje in Celje |
| 1892 | | first unsuccessful miner's strike |
| 1893 | | 32 miners die in a methane explosion |
| 1907 | | establishment of a coal mine rescue team |
| 1914 | | Lapp's successors sell the mine to the Austrian emperoro |
| 1928 | | construction of the Velenje thermal power plant |
| 1946 | | establishment of Rudnik lignita Velenje, a lignite producing company |
| 1950 - 1961 | | development of the town of Velenje through shock worker's actions |
| 1955 | | start of installation of steel lining and hydraulic supports in the mine |
| 25.11.1955 | | for the firs time production exceeds 1 milion tonnes of coal (1,116,500 tonnes) |
| 1956 | | construction of the first phase of the Šoštanj thermal power plant |
| 1959 | | gala opening of the new Velenje town centre |
| 1961 | | first mining event featuring the Jump over a leather apron |
| 1961 - 1965 | | lignite gasification stopped in the realisation phase (EKK) |
| 1970 | | electricity generation stops in the Velenje thermal power plant |
| 70's | | intensive mechanisation of coal production and tranport |
| 1974 | | self-management agreement on the merger of RLV and TEŠ in DO Rudarsko elektro-energetski kombinat Velenje (Velenje mining and electricity combine, or REK) |
| 1978 | | REK Velenje grows into Composite Organisation of Associated Labour, which comprises the activities that ran parallel with the coal mine: ESO, Sipak, Avtopark, Tiskarna, Družbeni standard, AOP, EFE, Mizarska dejavnost |
| 1980 | | 15 mining sites operational in the mine |
| 1981 | | for the first time in the history of the coal mine production exceedes 5 million tonnes of coal (5,001,000 tonnes) |
| 1984 | | record number of employees in Rudnik lignita Velenje (the Velenje lignite mine): 5.458 |
| 1985 | | record annual coal production: 5,106,400 tonnes |
| 1986 | | opening of the replacement facilities in Nove Preloge, and crushing and sorting plant in Pesje |
| mid 1980's | | production in Velenje accounts for 1 third of the total coal production in Yugoslavia |
| 1987 | | start of environmental remediation of the degraded environment resulting from operation of TEŠ and Premogovnik |
| 1995 | | installation of purification plant in unit 4 of TEŠ |
| 1995 | | Rudnik Lignita Velenje gets a new name: Premogovnik Velenje |
| 1997 | | installation of purification plant in unit 5 of TEŠ |
| 1998 | | ISO 9001 quality certification |
| 2000 | | ISO 14001 environmental management certification |
| 2001 | | establishment of Holding Slovenske elektrarne, which includes Premogovnik Velenje |
| 2002 | | concession for coal exploitation, which excludes the Šoštanj mine |
| 2002 | | Premogovnik Velenje becomes a public limited company |
| 2003 | | last tonnes of coal sold for general consumption; TEŠ becomes the sole consumer of the coal from Velenje |
| 2004 | | 10-year contract on coal purchasing signed between HSE, TEŠ and Premogovnik |
| 2005 | | the Premogovnik Velenje group comprises 11 associated companies |
| 2006 | | adoption of the decision to constract a 600 MW unit 6 of the Šoštanj Thermal Power Plant |
| 2007 | | production of coal of the highest quality - samples reach up to 12 MJ/kg |
| 2008 | | transfer of knowledge of Premogovnik Velenje experts to the Tuzla-based mine Mramor - start of mechanised production |
| | | record daily progress: 8.5 metres/day in G2/B in the northern part of the Preloge mine |
| | | operation of the longest face in history: 210-metre face in the Preloge mine |
| | | first fiber optic video transmission from the mine to the surface |
| | | new sales of coal outside the Šaleška valley: 60 000 tonnes to the Trbovlje thermal power plant |
| 2009 | | Premogovnik Velenje erects 10.5-metre sculpture "Mobil - everything revolves around coal", the highest sculpture in the Šaleška valley, to mark the 50th anniversary of the town centre |
| | | to mark the 50th anniversary of the town, the City of Velenje decorates Premogovnik Velenje with "the Cornerstone of Velenje" in recognition of its contribution in building and developing the town of Velenje |
| | | production limited to two faces simultaneously |
| 2010 | | 135th anniversary of Premogovnika Velenje |
| | | 50th Jump over a leather apron |
| 2011 | | launch of new 37-metre suspension system with Scharf diesel locomotive, which increases the capacity and security of transport of people and goods |
| | | world's first virtual presentation of underground coal production on our web site |
| | | first performance of a brass band 180 metres deep in the tunnels of the Coal Mining Museum of Slovenia in the history of Premogovnik |
| | | permanent display of the rescue equipment used by the coal mine rescue team since its beginnings |
| | | 51st Jump over a leather apron, marking the 50th anniversary of jumps |
| | | stakeholder sign an agreement to implement and finance Energy Development Centre, a researsh and development project |
| | | Premogovnik Velenje, Fairwood Group, Cigler & partners and Chescor Capital sign an agreement to establish Singapore-based joint venture Fairwood PV |
| 1875-2011 | | 226 104 112 tonnes of coal produced in 136 years (data from 31 December 2011) |