Sökning: "dagbrott"

Hittade 5 avhandlingar innehållade ordet dagbrott.

  1. 1. Sediment transport from source to sink in the Lake Baikal basin : Impacts of hydroclimatic change and mining

    Författare :Jan Pietroń; Jerker Jarsjö; Enrica Viparelli; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; sediment transport; human impact; hydroclimatic change; surface mining; metal-enriched sediment; Lake Baikal; the Selenga River; the Selenga Delta; Physical Geography; naturgeografi;

    Sammanfattning : Different magnitude, intensity and timing of precipitation can impact runoff, hillslope erosion and transport of sediment along river channels.  Human activities, such as dam construction and surface mining can also considerably influence transport of sediment and sediment-bound contaminants. LÄS MER

  3. 2. Optimisation of fragmentation and comminution at Boliden Mineral, Aitik Operation

    Författare :Peter Bergman; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Sammanfattning : Syftet med denna avhandling är att optimera fragmenteringen i Bolidens Minerals dagbrott Aitikgruvan. Sprängning är en av huvudprocesserna i gruvbrytning och dess resultat har stor inverkan på gruvans totala ekonomi. LÄS MER

  4. 3. Measuring occupational dust exposure with a passive sampler

    Författare :Mariam Shirdel; Ingvar Bergdahl; Britt Andersson; Håkan Wingfors; Christer Johansson; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; dust particles; mineral; PM10; PM2.5; respirable fraction; UNC passive aerosol sampler; working environment;

    Sammanfattning : Objectives: In a working environment it is important to measure dust exposure to evaluate possible health issues. Passive sampling could be an alternative to active sampling with pumps when measuring occupational dust exposure. One passive sampler is the University of North Carolina passive aerosol sampler (UNC sampler). LÄS MER

  5. 4. Footwall stability in SLC mining

    Författare :Mikael Svartsjaern; David Saiang; Andreas Eitzenberger; Doug Stead; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Sammanfattning : This thesis is based on a case study of the Kiirunavaara sublevel cave (SLC) mine. It focuses on footwall stability and damage development in the mining infrastructure on mine scale. Damage to the infrastructure is mappable for the full height of the footwall by access through decommissioned infrastructure associated with earlier mining stages. LÄS MER

  7. 5. Weichselian glaciations in the middle Notec River region, northwest Poland

    Författare :Gert Pettersson; Kvartärgeologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quaternary Geology; Kvartärgeologi; Geology; Geologi; Vistulian; Weichselian; Lithostratigraphy; Poland; Chodziez; Clast lithology; Clast fabrics; Deglaciation; Ice stream; Sedimentology; Sedimentologi; geomorphology; klimatologi; geomorfologi; climatology;

    Sammanfattning : This thesis presents results of studies on the ice flow pattern and ice movement mechanism during the Weichselian glaciations in the middle Notec River area, NW Poland. A new lithostratigraphy of the study area has been established, based on correlation of stratigraphical position, clast lithology, fabrics and grain size composition of till units. LÄS MER