(for LMBV by P. Radke, 2007 ) Open Pit Mining Closure in Lusatia New Landscapes and Lakes Dr. Uta Alisch Fugro Consult GmbH Minex Central Asia Forum 2015
History of Lignite Mining Lignite mining important for decades and centuries in Lusatia and Central Germany 1382 first discovery of lignite 1890 mechanised lignite mining began 1933 first bucket-wheel excavator was commissioned Lignite provided >70% of the former GDR s energy as the only real domestic source Coal Miners around 1920 2 Open pit mine Skado around 1965 (Archive: LMBV 2002)
Lignite Mining Districts Germany Lusatia Rhenish District Helmstedt District Central German District Lusatian District Post-mining landscape Sedlitz-Skado-Koschen (LMBV 2009) 3
Lignite Mining Districts Germany Lusatia 4
Effects of Mining Activities Transforming and Shaping Landscape: Deforested Woods, Deserted Areas, Removed Settlements, Mining Pits and Dumps / overburden spoil tips LMBV Relocation of the Emmaus-Church, build in the 13th century Heuersdorf to Borna Distance about 12 kilometres costs: EUR 3 million Decommissioning of former Lignite Mines 5
Remediation Requirements Goal of rehabilitation: Creation of a sustainable, save, and usable landscape with selfadjusting hydrologic balance Creation of stable slopes Recultivation Reconstruction of water balance Disposal of contaminated soil 6
Problem of Lignite Mining Remediation Soil Liquefaction fine-grained sands between 0.09 1.00 mm 7 (VOGT;WARMBOLD 2002)
Example of Settlement caused Slumpings 8
Solutions against soil Liquefaction Protection through construction of a hidden dam settlement endangered area rehabilitated slope section settlement mine dump hidden dam relic lake basement (VOGT;WARMBOLD 2002) 9
Blasting against Soil Liquefaction 10
Vibro-compaction against Soil Liquefaction Protection through vibrocompaction endangered tilting area rehabilitated slope section final water level average water level hidden dam mine dump relic lake basement (VOGT;WARMBOLD 2002) 11
Transforming Open Pit Mines into Lakes to the Greifenhain Lake from Spree river Maximum water levels Schwarze Elster river Navigable sea lane Transfer channel for Neiße water Flooding pipes 12
Transforming Open Pit Mines into Lakes Acidification of Lakes caused by Lignite Mining 13
LMBV Bilder (Bild+Text kopieren und auf weiße Seite einfügen) Bekalkung_Spree Bekalkungsschiff Bernsteinsee Grundwasserreinigungsanlage Rainitza (LMBV,Radke 2011) Grundwasserreinigungsanlage Schwarze Pumpe (Vattenfall 2013) 14
Brownfield redevelopment Exploration and risk analyses of environmental damages as well as design and supervision of ecological and economical clean-up procedures accompanied by innovative monitoring strategies 15
Groundwater flow and transport model 16
Lake District in Lusatia 17
LMBV Bilder (Bild+Text kopieren und auf weiße Seite einfügen) Ueberleiter_Sornoer_Kanal_Radke_2012-6ed405c4 Überleiter entstehen LMBV 2009 Ueberleiter12_Radke_2012-835f8b2a Ueberleiter_Rosendorfer-Kanal_Radke_2012-57fc5889 18
New Recreation Areas Source: Archive LMBV New homes and marina at Lake Hainer in Kahnsdorf Source: Archive LMBV Floating houses at Lake Geierswalder 19
Thanks for your attention Contact Fugro Consult GmbH Wolfener Straße 36U D-12681 Berlin Tel: +49 (0)30 93651-301 U.Alisch@fugro.de mining@fugro.de