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Seismic characterization of the Grangesberg iron deposit and its mining-induced structures, central Sweden
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Mineralogi, petrologi och tektonik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper, Geofysik.
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2015 (Engelska)Ingår i: Interpretation, ISSN 2324-8858, E-ISSN 2324-8866, Vol. 3, nr 3, s. SY41-SY56Artikel i tidskrift (Refereegranskat) Published
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Abstract [en]

We have conducted a reflection seismic investigation over the apatite-iron deposit at Grangesberg in central Sweden. At the time of closure in 1989, the mine was operated using the sublevel caving method down to approximately a 650-m depth. This mining technique caused subsidence and generated a network of faults that propagated from excavated zones at depth up to the surface. The Grangesberg deposit is the largest iron oxide mineralization in central Sweden and is planned to be mined again in the coming years. It is therefore imperative to have a better understanding of the ore geometry and the fault network. A reconnaissance survey consisting of two seismic lines with a total length of 3.5 km was carried out to address these issues. The profiles intersect the Grangesberg deposit and open pit, as well as the major mining-induced fracture zone present in this area. A drop-hammer source mounted on a hydraulic truck was used to generate seismic signals; cabled and wireless receivers were used for the data recording. Preprocessing of the data first required the cable-and wirelessrecorded data sets to be merged before stacking all data available at each shot point. Source gathers exhibit reflections from the near surface, probably generated at lithological boundaries hosting the iron mineralization and other geologic structures. Deeper reflections were also observed. The metavolcanic assemblage hosting the mineralization and the anthropogenic fault network were depicted in the stacked sections, bringing in new elements to refine the geologic model of the area. This study also illustrated the ability of reflection seismic methods to delineate mining-induced structures in hard-rock environments. Low-velocity anomalies from the open pit and adjacent structures were depicted in tomographic sections along the two lines, which showed good agreement with known geologic features and the reflection seismic results.

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2015. Vol. 3, nr 3, s. SY41-SY56
Nationell ämneskategori
Geofysik Geokemi
Forskningsämne
Geovetenskap med inriktning mot mineralogi, petrologi och tektonik
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URN: urn:nbn:se:uu:diva-269284DOI: 10.1190/INT-2014-0212.1ISI: 000364362900051OAI: oai:DiVA.org:uu-269284DiVA, id: diva2:882658
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Sida - Styrelsen för internationellt utvecklingssamarbeteSida - Styrelsen för internationellt utvecklingssamarbeteTillgänglig från: 2015-12-15 Skapad: 2015-12-15 Senast uppdaterad: 2017-12-01Bibliografiskt granskad

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Place, JoachimMalehmir, AlirezaHögdahl, KarinJuhlin, Christopher

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