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THE ORE DATABASE
 3301 - 008 Glitre
(Object Id: 36917)
(Last updated: 12.12.2023)

Name of Ore Province: Glitre
(Object Id: 36917 8,00,00)

Location
County: Buskerud Municipality: Drammen (3301)
Map 1:50000: Lier (1814-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 559931 m. North: 6634430 m.
Longitude: 10.0694480 Latitude: 59.8431800
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Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Molybdenium
Element(s):


Information(s) in free text format
Free text
According to Schønwandt (1986) molybdenite mineralization is widespread in the Glitrevann complex and took place late in the evolution of the Glitrevann caldera. Molybdenite mineralization is associated with the resurgent granitic stock and the vent-erupted Bordvika ignimbrite. Furthermore molybdenite occurs as sporadic disseminations along the northwestern border of the caldera. Molybdenite mineralization in the granitic stock is spatially related to the annular aplite granite where molybdenite occurs a) in open space fractures together with quartz and pyrite. Only part of the fracture system is enveloped by sericite alteration. b) in quartz-alkalifeldspar pegmatites. c) in miarolitic cavities together with pyrite, quartz and alkalifeldspar. d) as sporadic disseminations in aplite granite. Spatially related to aplite granite are also molybdenite disseminations within the ash-fraction of pyroclastic flow. Pervasive sericite alteration follows this type of molybdenite occurrence. Molybdenite occurs as sporadic disseminations in pervasively sericitized medium-grained granite where the alternation is probably controlled by prominent structures. The most interesting molybdenite is hosted by the Bordvika ignimbrite where molybdenite occurs in a mineralized stock-work associated with sericite alteration.

Bibliography:
From NGU's Reference Archive:
Bjerkgård, Terje; Ihlen, Peter M.; Sandstad, Jan Sverre , 2016
De viktigste mineralressursområdene i Buskerud
;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2016.013;20 pages
Abstract:
Inntil nå har de aller fleste av Norges mineralressurser kun vært punktfestet, dvs. uten et definert areal. De har også i liten grad vært verdisatt, dvs. i hvilken grad de er viktige ressurser. Dette er problematisk i forhold til f.eks. kommuneplaner, verneplaner, veiplaner osv. Viktige økonomiske forekomster og områder med et høyt potensial for å finne drivverdige forekomster kan bli båndlagt ved annen aktivitet/utbygging/fredning osv. Det er derfor besluttet at ressursene skal verdisettes og omsluttes av arealer i henhold til standardiserte kriterier.

References not to be found in NGU's Reference Archive.:
Schønwandt, H. K. (1986) The volcanic history and the molybdenite mineralization of the Glitrevann caldera. In Olerud, S. & Ihlen (editors) (1986) Metallogeny associated with the Oslo Paleorift. 7th IAGOD symposium and Nordkalott project meeting. Excusion guide no 1. SGU.

Location
County: Buskerud Municipality: Drammen (3301)
Map 1:50000: Lier (1814-4) Map 1:250000: Oslo
County: (Unavailable)

Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Molybdenium
Element(s): Mo
Importance
Raw material meaning: (No data)

Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Mineralization
Genesis: Form:
Main texture: Min. distribution:
Main grain size: Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Period:
Province:
Geotec.unit:
Tectonic complex:
Igneous complex:
Group: Formation:

Information(s) in free text format
Free text
Røskingsarbeider ved Vrangla, Glitrevann syd, utført av Norsk Hydro 1981 har vist klart forhøyede verdier av Mo.

Bibliography:
From NGU's Reference Archive:
Lindberg, P.A.; Schønwandt, H.K. , 1982
Statusrapport for Mo-mineraliseringen ved Vrangla, Glitrevann-syd, 1981
;Norsk Hydro / NGU;RAPPORT;NH-arkivet; No.NH 4A;5+kart pages
Abstract:
Røskingsarbeider ved Vrangla, Glitrevann-syd har vist klart forhøyede verdier på Mo i et område av Ullvann tuff. Den mineraliserte bergart overleires av Bordvika ignimbritten, som har fungert som et impremeabelt "lokk" for de mineraliserende løsninger. Den mulige kildebergart for de hydrotermale løsninger, aplittgranitten, går i dagen rett syd for røskingsområdet. Aplittgranittens sydgrense er sterkt overdekket, men det opptrer flere jordprøveanomalier med Mo langs grenseområdet.
Drill Cores: Glitrevatnet

Location
County: Buskerud Municipality: Drammen (3301)
Map 1:50000: Lier (1814-4) Map 1:250000: Oslo
Coordinate system: EU89-UTM Zone 32
East: 559418 m. North: 6635541 m.
Longitude: 10.0606080 Latitude: 59.8532340
Show on map

Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Molybdenium
Element(s): Mo
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Mineralization
Genesis: Form:
Main texture: Min. distribution:
Main grain size: Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Period:
Province:
Geotec.unit:
Tectonic complex:
Igneous complex:
Group: Formation:

Information(s) in free text format
Free text
According to Schønwandt (1986) the most interesting molybdenite mineralization within the Glitrevann caldera is hosted by the Bordvika ignimbrite where molybdenite occurs in a mineralized stock-work associated with sericite alteration. Along the southeastern shore of Bordvika, molybdenite occur in mineralized fractures and associated sericite alternating in Bordvika ignimbrite. The Bordvika ignimbrite appeas as a homogeneous quartz-feldspar porphyry with grey to black, aphanitic matrix. The feldspar and quartz phenocrysts constitute respectively about 30vol% and 10% vol% of the ignimbrite. Hydrothermal sericite alteration in the Bordvika area occurs in a stockwork-like pattern. This sericite alteration primarily occurs as envelopes along mineralized fractures. In the most intensely altered areas the envelopes can be more than 1 m wide, although generally theyu are in dm-cm range. The sericite altered ignimbrite is white to grey and consists of sericite, quartz and pyrite. The alteration process has destroyed most of the primary textures although quartz appear largely unaffected. The mineralized fractues show mineral assemblages comprising quartz, molybdenite, pyrite, magnetite and alkali-feldspar. The sericite enveloped fractues are cut by several types of mineralized fractues which occur without any visible alteration envelopes. Mineral assemblages of these include: 1) molybdenite-quartz-pyrite 2) pyrite 3) quartz-alkalifeldspar-molybdenite-pyrite. The presence of both altered and unaltered mineralized fractures indicates that at least two molybdenite mineralization events have occured in the stockwork alteration zone. Schønwandt (1986) interprets the molybdenite occurence at Bordvika as a mineralization formed by fumaroclic activity during degassing and welding of the ignimbrite.

Bibliography:
From NGU's Reference Archive:
Meisfjord, Norodd , 1987
Diamantboring Glitrevann, Drammensmarka
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.87.030;34 pages

Jensen, Inger Spangsberg , 1985
Geochemistry of the central granitic stock in the Glitrevann cauldron within the Oslo rift, Norway.
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.65 (3);201-216 pages
Abstract:
Frie emneord: Stokk (Pluton) The central granitic stock within the Glitrevann cauldron comprises three main granitic types, of which the youngest one, an aplitic granite, is associated with significant porphyri-Mo mineralizations. A mineralogical and geochemical differentiation is developed from the older granite types towards this aplitic granite. Quantitative trace element modelling, based on crystal fraction using petrographic mixing calculations relating three main compositions, suggests that the aplitic granite represents a fractionated residual fluid phase, giving rise to the mineralizations.

Bjerkgård, Terje; Ihlen, Peter M.; Sandstad, Jan Sverre , 2016
De viktigste mineralressursområdene i Buskerud
;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2016.013;20 pages
Abstract:
Inntil nå har de aller fleste av Norges mineralressurser kun vært punktfestet, dvs. uten et definert areal. De har også i liten grad vært verdisatt, dvs. i hvilken grad de er viktige ressurser. Dette er problematisk i forhold til f.eks. kommuneplaner, verneplaner, veiplaner osv. Viktige økonomiske forekomster og områder med et høyt potensial for å finne drivverdige forekomster kan bli båndlagt ved annen aktivitet/utbygging/fredning osv. Det er derfor besluttet at ressursene skal verdisettes og omsluttes av arealer i henhold til standardiserte kriterier.

References not to be found in NGU's Reference Archive.:
Schønwandt, H. K. (1986) The volcanic history and the molybdenite mineralization of the Glitrevann caldera. In Olerud, S. & Ihlen (editors) (1986) Metallogeny associated with the Oslo Paleorift. 7th IAGOD symposium and Nordkalott project meeting. Excusion guide no 1. SGU.


Geyti, A. & Scønwandt, H.C. 1979. A possible porphyry molybdenum occurrence within the Oslo Rift, Norway. Economic Geology, Vol. 74, 1211-1220.


The fact sheet was created on 28.03.2024

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