Designated Czech cultural monument over jáma 3 of the former Důl Maršál Jeremenko colliery in Ostrava-Vítkovice.
Jeremenko 3 is the third and deepest shaft of the former Důl Maršál Jeremenko colliery in Ostrava-Vítkovice, founded as a new shaft in 1943 and reaching its final depth of 1,062 metres in 1966. Over jáma 3, a hammer-type (kladivová) headframe was erected to a height of 53 metres, with a viewing gallery at 43 metres and an above-ground engine room clad in glazed curtain-wall facades. The winding engine installed was a Koepe-type four-rope skip-cage system of 2,500 kW by ČKD, placed in service in 1967 and rated for depths to 1,245 metres.
Jáma 3 served as the principal production shaft for the colliery's later operational decades until mining ceased on 31 December 1992. Following closure, jáma 3 was retained as part of the mine water pumping installation managed by state enterprise DIAMO. The kladivová headframe and its associated shaft building were declared a Czech cultural monument in 2001 and remain standing as one of the most prominent industrial landmarks of Ostrava.
Jáma 3 of the Důl Maršál Jeremenko colliery was conceived during the Second World War to access the deepest coal reserves of the Vítkovice field. Hloubení was begun in 1943 under wartime direction; by June 1944 the shaft had reached 133 metres. Severe tectonic disturbances and the shortage of wartime labour forced a suspension of the work. After the war, sinking resumed and the shaft advanced through the 1950s and into the 1960s under the enlarged state enterprise structure. Jáma 3 reached its final depth of 1,062 metres in 1966, making Důl Jeremenko one of the deepest collieries in the Ostrava-Karviná district.
The shaft was of circular cross-section. Over it was erected a kladivová (hammer-type) headframe, a T-shaped steel structure standing 53 metres in total height, with a viewing gallery at 43 metres and a prismatic above-ground engine room with suspended glazed curtain-wall facades. This form of headframe was favoured where ground conditions were favourable and space at the surface was limited, as the hoisting ropes were kept entirely within the structure and protected from weather. The architecture of the jáma 3 tower is characteristic of the 1960s Brusselian industrial style, contrasting markedly with the older red-brick buildings of the original colliery complex.
In 1966 the above-ground engine room received a Koepe-type electric winding engine of 2,500 kW capacity, manufactured by ČKD. The four-rope skip-cage hoisting system was commissioned in 1967, with four hoisting ropes and two equalising ropes, rated for hoisting from depths up to 1,245 metres. Jáma 3 thereupon became the principal hoisting shaft for the colliery's deepest workings.
In 1967 jáma 1, the original winding shaft, was converted to a ventilation shaft, as production was concentrated on jáma 3. In 1979 the lower portion of the Důl Alexander field was attached to the Jeremenko working area, further increasing the productive load on jáma 3.
Mining across the entire Důl Maršál Jeremenko complex ceased on 31 December 1992, with total output over the period 1896–1992 amounting to 28.54 million tonnes of coking coal. Following closure, jáma 2 was backfilled in 1996. Jáma 3, together with jáma 1, was retained as an active mine water pumping installation. From 2001 the site passed to state enterprise DIAMO, ODRA branch. Water pumps operate in the shaft system to maintain groundwater stability across the Ostrava coalfield basin and to protect the still-active Karviná collieries from inundation via the Michálkovice barrier.
The kladivová headframe and the associated jáma 3 shaft building were declared a Czech cultural monument in 2001. The Památkový katalog records the structure as a key example of 1960s industrial architecture combining red infill brickwork, large-format glazing, and a green steel frame. The AEG Union electric motor and the Siemens-Schuckert electric winding engine originally transferred from Důl Jindřich in Moravská Ostrava are preserved in situ as heritage-listed technical equipment. The headframe is one of the principal industrial landmarks visible on the Ostrava skyline. Maintenance works including replacement of the glazed curtain-wall panels have been carried out by DIAMO's mine rescue specialists from the HBZS Ostrava station.