Underground extraction and processing of ferriferous coral oolite (iron ore) as well as residual material recovery as a certified waste management company
BARBARA ERZBERGBAU GMBH
Porta Westfalica (Wohlverwahrt-Nammen mine, An der Erzgrube 9)New on Amplifa
About us
BARBARA ERZBERGBAU GmbH operates the Wohlverwahrt-Nammen mine in Porta Westfalica at the Weser hills and specialises in the underground extraction and processing of ferriferous coral oolite (iron ore). From the extracted rock, the company produces mineral mixes, ballast, chippings and crushed sands for civil and road engineering, armourstones and slope paving for hydraulic and road construction, decorative chippings, path slabs and dry stone-wall blocks for landscaping, as well as aggregates for the concrete and cement industry; it also supplies wind farms and the railway sector with track ballast as well as planing and protective layers. Using the room-and-pillar mining method, excavated cavities are secured with paste and pillar support backfill; for this purpose, approved residual materials such as fly ashes and gypsums from hard coal power stations are processed with binders and water in three mixing plants. As a certified waste management company, the company recovers residual materials in an environmentally friendly manner. Delivery and dispatch take place by truck, rail and ship via a private siding, with a focus on northern Germany.
- Site
- Porta Westfalica
- Processes
- Underground extraction and processing of iron ore (ferriferous coral oolite), Production of mineral mixes, ballast, chippings and crushed sands for civil and road engineering, Provision of armourstones, chippings and slope paving for hydraulic and road construction, Provision of rock blocks, decorative chippings, path slabs and dry stone-wall blocks for gardens and, Supply of colouring aggregate (red-brown) and aggregates for the concrete industry, Supply of raw material and aggregate for the cement industry, Provision of track ballast as well as planing and protective layers for the railway sector, Paste backfill for safeguarding old mining workings (pillar support backfill, room-and-pillar
- Materials
- Ferriferous coral oolite (iron ore), Limestone, Fly ash (from hard coal power stations), Gypsum (from hard coal power stations)
- Certificates
- Waste management company (certified), Certified waste management company (certified)
- Founded
- 1883
- Industries
- Construction industry, Civil and road engineering, Hydraulic and road construction, Gardening and landscaping, Concrete industry, Cement industry
- 01
Underground extraction of the ferriferous coral oolite
- 02
Processing in crushing, screening and bunker facilities
- 03
Production of mineral mixes, ballast, chippings and crushed sands
- 04
Production of backfill material in mixing plants (fly ash, gypsum, binder,
- 05
Installation of the backfill in excavated cavities
- 06
Logistics by truck, rail and ship
Raw materials and processes
Ferriferous coral oolite (iron ore)
Iron ore extracted underground, which is processed into mineral mixes, ballast, chippings, crushed sands and aggregates for construction and the concrete and cement industry.
Limestone
Raw material extracted since 1956 in the Wülpker Egge open-cast pit for construction and industry.
Fly ash (from hard coal power stations)
Approved residual material for the production of backfill material used to fill excavated cavities.
Gypsum (from hard coal power stations)
Approved residual material from flue gas cleaning that is used in the backfill material.
Sites
Porta Westfalica
DEWohlverwahrt-Nammen mine: underground ore extraction, processing, backfill, administration
- Materials
- Ferriferous coral oolite, limestone, fly ash, gypsum
- Crushing, screening and bunker facilities
- Electro-hydraulic two-boom drilling rigs
- 3 mixing plants for backfill material production
- Pneumatic rail wagon unloading facility
- Pilot plant for paste backfill
- Private siding
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Underground extraction and processing of iron ore (ferriferous coral oolite)Casting | – | – | – | – | Iron ore (ferriferous coral oolite), Limestone |
| Production of mineral mixes, ballast, chippings and crushed sands for civil and road engineeringSurface | – | – | – | – | Ferriferous coral oolite |
| Provision of armourstones, chippings and slope paving for hydraulic and road constructionSurface | – | – | – | – | Ferriferous coral oolite |
| Provision of rock blocks, decorative chippings, path slabs and dry stone-wall blocks for gardens andSurface | – | – | – | – | Ferriferous coral oolite |
| Supply of colouring aggregate (red-brown) and aggregates for the concrete industrySurface | – | – | – | – | Ferriferous coral oolite |
| Supply of raw material and aggregate for the cement industrySurface | – | – | – | – | Ferriferous coral oolite |
| Provision of track ballast as well as planing and protective layers for the railway sectorSurface | – | – | – | – | Iron ore products |
| Paste backfill for safeguarding old mining workings (pillar support backfill, room-and-pillarEngineering | – | – | – | – | Fly ashes, Gypsums (from hard coal power stations), Binders, Water |
| Environmentally friendly recovery of residual materials (certified waste management company)Engineering | – | – | – | – | Residual materials |
8 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Crushing, screening and bunker facilities | – | – | – | 1934-1939 | Nammen mine |
| Electro-hydraulic two-boom drilling rigs | – | – | – | – | Porta Westfalica |
| Mixing plants (3 differently structured plants for backfill material production) | – | 3 | – | – | Wohlverwahrt-Nammen mine |
| Pneumatic rail wagon unloading facility | – | – | – | 1977-1988/ | Porta Westfalica |
| Pilot plant for paste backfill | – | – | – | 2011 | Porta Westfalica |
| 10-tonne low-loading dump trucks | – | – | – | 1959-1964 | Porta Westfalica |
| 20-tonne heavy goods vehicles | – | – | – | 1959-1964 | Porta Westfalica |
| 40-tonne heavy goods vehicles | – | – | – | 1977-1988/ | Porta Westfalica |
Additional services
Quality and certification
The company is a certified waste management company; a control system ensures that only approved materials are installed, and the environmental compatibility of the backfill is regularly reviewed by the authorities.
| Evidence | Porta Westfalica |
|---|---|
| Certified waste management company (certified) |
History
- 1835
Granting of the 'Wohlverwahrt' ironstone field to Johann Dinnendahl
- 1883
Start as Gewerkschaft Wohlverwahrt with extraction of ironstone from the Wohlverwahrt seam, daily output 40–50 t
- 1926
Taken over by Vereinigte Stahlwerke AG, founding of Rohstoffbetriebe GmbH
- 1934–1939
Driving of the Wülpker adit, start of Klippen seam extraction, construction of crushing, screening and bunker facilities, commissioning of the Nammen mine
- 1952
Underground connection of the Wohlverwahrt and Nammen mines; founding of Barbara Erzbergbau AG
- 1956–1957
Start of limestone and ore extraction in the Wülpker Egge open-cast pit, switch to rail-less transport vehicles
- 1959–1964
Introduction of 10-tonne low-loading dump trucks and 20-tonne heavy goods vehicles, use of electro-hydraulic drilling rigs
- 1966–1971
Taken over by Barbara Rohstoffbetriebe GmbH, commissioning of modern crushing and screening plants
- 1977–1988/89
Conversion of ore transport to 40-tonne heavy goods vehicles, construction of a pneumatic rail wagon unloading facility
- 1978
Driving of the BARBARA ramp for direct large-machinery access
- 1988
Leasing of the Wohlverwahrt mine to the Kleinenbremen visitor mine
- 2001
Taken over by Barbara Beteiligungs-Gesellschaft mbH
- 2003
Founding of BARBARA ERZBERGBAU GMBH
- 2006
Taken over by the Wesling group of companies (Ferdinand Wesling)
- 2008
Reactivation of the private siding and the ridge hiking trail (Weserberglandweg XW)
- 2011
Trial operation of a pilot plant for paste backfill
- 2013
Successful paste backfill trial; creation of a biotope in the open-cast pit with NABU
- 2023
140th anniversary