The Mine is located in the province Gelderland, approx. 155 km east-south-east of Amsterdam, the capital of the Netherlands.

The Winterswijk quarry, near the hamlet of Ratum, is an open cast mine where mainly limestone is extracted. The quarry has been in operation since 1932 by NV Winterswijkse Steen-en Kalkgroeve, now part of Sibelco. One of the three quarries is still in use. Production is around 200 ktons/year. The two other quarries are now protected as nature reserves. They are also part of the Winterswijk National Landscape proclaimed by the Dutch government in 2005, an area of almost 22,000 hectares in total.

Sibelco Europe BV is planning to expand the open quarry. To prevent horizontal water flows into the quarry, a seepage barrier under a future dike body is necessary.

BAUER Funderingstechniek BV was awarded a cut-off wall as seepage barrier, which was executed by means of the Mixed-in-Place method.

Geology

Sand and gravel were encountered down to the required depth.

Scope of works

• Mixed-in-Place cut-off wall
• In total: 4,000 m²
• Nominal thickness: 55 cm
• Maximum depth: 14.5 m

INFO

Construction Method:            Mixed-in-Place

Construction Material:            Soil-slurry mix

Main Equipment:                    BAUER RG 25 S

Construction Period:              June 2016