Extraction and processing of greywacke into ballast, grit, crushed sand and hydraulic engineering stone
Schotterwerk Clemens GmbH & Co. KG
Gummersbach (headquarters/administration) · Bergneustadt (Stentenberg quarry)New on Amplifa
About Schotterwerk Clemens
Schotterwerk Clemens GmbH & Co. KG, headquartered in Gummersbach, operates the large greywacke quarry Stentenberg west of Bergneustadt in the Oberbergisch district. On a quarry site of around 80 hectares, quartzite-bearing greywacke (grey quartzite) is extracted by drilling and blasting in accordance with established regulations and standards. The raw material, with a maximum piece size of up to 1400 mm, is processed via primary and secondary crushers as well as several cone crushers into ballast, high-quality grit, foundation material, crushed sand, sand-grit mixtures, armourstone and heavy-duty wall blocks. The greywacke is characterized by high abrasion resistance and a high PSV value and is used, among other things, on runways at the Cologne and Düsseldorf airports. Delivery is carried out with an own fleet of 15 semi-trailers to the Cologne-Düsseldorf region as well as to the Dutch market. The company is part of the Dutch Van Nieuwpoort Group.
- Site
- Gummersbach
- Processes
- Blasting extraction of greywacke (drilling and blasting), Crushing with jaw crusher (0/1400 mm to 0/400 mm), Second crushing stage (secondary crusher), High-quality grit production with cone crushers (grit plant), Production of ballast, foundation material, crushed sand, sand-grit mixture, coarse ballast, Drilling and blasting (extraction), Crushing and processing (jaw crusher, cone crusher), Own fleet of 15 semi-trailers (logistics/delivery)
- Materials
- Greywacke (grey quartzite), quartzite-bearing greywacke (greywacke grit)
- Founded
- 1948
- Employees
- 50–100
- Industries
- Road construction, Asphalt construction (ZOAB/fly ash asphalt), Concrete construction, Civil engineering, Hydraulic engineering, Railway construction (railway ballast)
- 01
Drilling and blasting (extraction)
- 02
Transport with wheel loaders, excavators and dump trucks
- 03
Primary crushing (jaw crusher, 0/1400 mm to 0/400 mm)
- 04
Intermediate storage and underground discharge
- 05
Secondary crushing (two secondary crushers)
- 06
High-quality grit production in grit plant with cone crushers
- 07
Delivery with own fleet
Raw material and processing methods
Greywacke (grey quartzite)
Hard, quartzite-bearing natural stone with high abrasion resistance and brightness, suitable for asphalt and concrete construction.
quartzite-bearing greywacke (greywacke grit)
PSV value 60; used as high-quality grit for asphalt, concrete pavements and airport runways.
Sites
Stentenberg quarry, Bergneustadt
DEExtraction and processing
- Part weight / size
- Raw material up to 1400 mm piece size
- Materials
- Greywacke, quartzite-bearing greywacke
- Jaw crusher
- Cone crusher (grit plant)
- Cone crusher (high-quality grit plant)
- Primary crusher
- Secondary crusher
- Wheel loader
- Excavator
- Dump truck
Gummersbach
DEAdministration and headquarters
- Semi-trailers (own fleet, 15 vehicles)
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Blasting extraction of greywacke (drilling and blasting)Forming | – | – | – | – | Greywacke, quartzite-bearing greywacke |
| Crushing with jaw crusher (0/1400 mm to 0/400 mm)Forming | – | 1400 mm | – | – | Greywacke |
| Second crushing stage (secondary crusher)Forming | – | – | – | – | Greywacke |
| High-quality grit production with cone crushers (grit plant)Forming | – | – | – | – | Greywacke, Greywacke grit, quartzitic greywacke |
| Production of ballast, foundation material, crushed sand, sand-grit mixture, coarse ballastForming | – | – | – | – | Greywacke |
10 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Jaw crusher | – | 1 | – | – | Stentenberg quarry, Bergneustadt |
| Cone crusher | – | 2 | – | – | Stentenberg quarry, Bergneustadt |
| Cone crusher (grit plant) | – | 1 | – | – | Stentenberg quarry, Bergneustadt |
| Cone crusher (high-quality grit plant) | – | 3 | – | – | Stentenberg quarry, Bergneustadt |
| Primary crusher | – | 1 | – | – | Stentenberg quarry, Bergneustadt |
| Secondary crusher | – | 2 | – | – | Stentenberg quarry, Bergneustadt |
| Wheel loader | – | – | – | – | Stentenberg quarry, Bergneustadt |
| Excavator | – | – | – | – | Stentenberg quarry, Bergneustadt |
| Dump truck | – | – | – | – | Stentenberg quarry, Bergneustadt |
| Semi-trailer (own fleet) | – | 15 | – | – | Gummersbach |
Additional services
Reference customers
History
- 1948
Guido Clemens opens a first greywacke quarry for ballast production ('Guido Clemens Schotterwerke') based in Bergneustadt.
- 2001
Conversion into Schotterwerk Clemens GmbH & Co. KG based in Gummersbach; the Dutch Van Nieuwpoort Groep becomes the main shareholder.