Institutt for geovitenskap og petroleum
Recent Submissions
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Ingeniørgeologisk kartlegging og numerisk modellering i UDEC og RS2, med parameterstudier, for Fornebubanen
(Master thesis, 2020)I forbindelse med prosjektering av den nye t-banestrekningen Fornebubanen har det blitt uttrykt interesse for å se nærmere på ingeniørgeologisk numerisk modellering. Målet med denne oppgaven er å sammenlikne de to ... -
Undersøkelser av hydrogeologiske forhold i et kystnært grunnvannsmagasin – Kartlegging av grunnvannsstrømning og interaksjon mellom ferskt grunnvann, elv og salt grunnvann ved nyetablerte løsmassebrønner på Kyrksæterøra i Heim kommune
(Master thesis, 2020)Hydrogeologien i et fjorddelta på Kyrksæterøra i Heim kommune er undersøkt. Det er utført felt- og laboratoriearbeid i en periode med prøvepumping av grunnvann fra to nyetablerte, skråstilte produksjonsbrønner. Prøvepumpingen ... -
Ore-forming processes in volcano-sedimentary hosted massive sulphide deposits in the Mofjell group, Nordland, Norway
(Master thesis, 2020)Mofjellgruppen i Rödningsfjäll skyvedekkekompleks er vert for flere malmforekomster, hvor noen av dem har vært utvunnet. I denne avhandlingen skal to av forekomstene som ikke har vært utvunnet før, Hesjelia sonen og ... -
Dynamic rock support in burst-prone rock masses
(Chapter, 2018)Rockburst occurs in hard and strong rock after excavation when the in situ rock stresses are high. The “driving force” for rockburst is the energy released from the rock mass. The released strain and seismic energy is ... -
Purification of High-grade Calcite Ore by Flotation with Alkyl Diamines
(Peer reviewed; Journal article, 2018)A very high-grade calcite deposit located in northern Norway consists of CaCO3 ore with minor silicate and sulphide impurities. Cationic (Tallow-1,3-diaminopropane, Duomeen T) collector has been used in the purification ... -
Comparison of single and mixed reagent systems for flotation of copper sulphides from Nussir ore
(Peer reviewed; Journal article, 2019)The present study investigates the application of thiol collectors and their mixtures on the flotation of copper-silver-gold minerals from a new copper mine located in northern Norway. The copper minerals (chalcopyrite, ... -
ISRM Suggested Method for Determining the Basic Friction Angle of Planar Rock Surfaces by Means of Tilt Tests
(Peer reviewed; Journal article, 2018)The basic friction angle plays a key role when estimating the shear strength of discontinuities for rock engineering projects, since a large body of research has shown that rock joint shear strength models that consider ... -
Multistep Parametric Inversion of Scanning Magnetic Microscopy Data for Modeling Magnetization of Multidomain Magnetite
(Peer reviewed; Journal article, 2019)Development in instrumentation and technology now allows for mapping of magnetic anomalies, caused by spatial variations in magnetization in the source material, from the mineral to the crustal anomalies scale. High-resolution ... -
Wavefield reconstruction for velocity–stress elastodynamic full-waveform inversion
(Peer reviewed; Journal article, 2020)Gradient computations in full-waveform inversion (FWI) require calculating zero-lag cross-correlations of two wavefields propagating in opposite temporal directions. Lossless media permit accurate and efficient reconstruction ... -
Compositional Features and Swelling Potential of Two Weak Rock Types Affecting Their Slake Durability
(Journal article, 2021)Weak and weathered rocks are well known for their sensitivity to changes in moisture content. Degrading behavior is common in weak rocks with moisture-sensitive mineral components and present numerous stability problems. ... -
Investigation of copper recovery from a new copper deposit (Nussir) in northern Norway
(Peer reviewed; Journal article, 2019)Norway has seen an upsurge of interest in exploiting its mineral deposits during the last decade. One of the major areas of interest is a huge copper deposit, operated by Nussir ASA located in the Repparfjord tectonic ... -
Operation of Norwegian Hydropower Plants and Its Effect on Block Fall Events in Unlined Pressure Tunnels and Shafts
(Peer reviewed; Journal article, 2021)The main objective of this study is to investigate the effect of hydropower plant operation on the long-term stability of unlined pressure tunnels of hydropower plants in Norway. The authors analyzed the past production ... -
Evaluation on the Efect of Pressure Transients on Rock Joints in Unlined Hydropower Tunnels Using Numerical Simulation
(Peer reviewed; Journal article, 2021)Frequent pressure transients are identified as the cause of block failures in many unlined hydropower tunnels. The primary design objective of such tunnels is to prevent hydraulic jacking at design static pressure and mass ... -
Green foam-based methods of mineral and ion separation
(Chapter, 2020)We discuss an important gap in the literature on progress toward the development of green (microbial-derived) reagents in conventional (froth flotation) and emerging (foam flotation)separation methods. For comparison, we ... -
Application of glucolipid bola-amphiboles biosurfactant in mineral processing
(Chapter, 2021)Yeast-derived amphiboles have attracted considerable attention for their applications in various industrial sectors. However, only a few studies on this class of surfactant have been reported to be relevant to mineral ... -
Organosilane and lignosulfonate as innovative stabilization techniques for crushed rocks used in road unbound layers
(Peer reviewed; Journal article, 2020)The tunnelling operations connected to the construction of the new Norwegian E39 highway generate a considerable amount of blasted rocks. The local use of these rocks as construction materials in the unbound layers of the ... -
An overview of calcite recovery by flotation
(Peer reviewed; Journal article, 2020)In general, precipitated calcium carbonate (PCC) is used as amineral filler in paper industries; while natural calcite (CaCO3) ore is also suitable for industrial use if it is a finely ground high-grade material. Naturally, ... -
Geometrically derived efficiency of slow immiscible displacement in porous media
(Peer reviewed; Journal article, 2020)The efficiency of a displacement is the fraction of applied work over the change in free energy. This displacement efficiency is essential for linking wettability to applied work during displacement processes. We quantify ... -
Liquiñe‑Ofqui’s fast slipping intra‑volcanic arc crustal faulting above the subducted Chile Ridge
(Peer reviewed; Journal article, 2021)The southernmost portion of the Liquiñe-Ofqui fault zone (LOFZ) lies within the proposed slab window which formed due to oblique subduction of the Chile Ridge in Patagonia. Mapping of paleo-surface ruptures, offsets, and ... -
Contact Angles in Two-Phase Flow Images
(Peer reviewed; Journal article, 2020)In this work, we calculate contact angles in X-ray tomography images of two-phase flow in order to investigate the wettability. Triangulated surfaces, generated using the images, are smoothed to calculate the contact angles. ...
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