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THE ORE DATABASE
Deposit 1867 - 004 Selvåg
(Object Id: 2257)
(Last updated: 12.10.2017)

Location
County: Nordland Municipality: Bø (1867)
Map 1:50000: Nykvåg (1132-1) Map 1:250000: Svolvær
Coordinate system: EU89-UTM Zone 33
East: 482730 m. North: 7628999 m.
Longitude: 14.5726080 Latitude: 68.7720040
Show on map

Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron-Titanium
Element(s): Fe Ti
Importance
Raw material meaning: National Importance (reg. 26.05.2015)

Resources and production
Activity: Exploration Reserves: 44000 thousand tons
Operating method: Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Fe 25 % 26.05.2015
Ti 2,5 % 12.10.2017
V 0,15 % 26.05.2015

Mineralization
Era: Proterozoic Period: Paleoproterozoic
Genesis: Orthomagmatic formation Form: Plate
Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration:
Strike/Dip: Direction:
Plunge:
Ti-deposit type(s)
Main type: Magmatic Ilm/Mt-ratio:
Sub type: Mt +/- Ilm +/- Ap in mafic intrusion %TiO(Ore):
Titanium province: Lofoten - Vesterålen %P2O5(Ore):
Host rock: Gabbro %MgO(Ilm):
Main Ti mineral: Ilmenite %V2O3(Mt):
ppm U (Rutile):
Stratigraphic classification of host rock
Era: Proterozoic Period: Paleoproterozoic
Province: Caledonian Basement Province
Geotec.unit: Lofoten-Vesterålen Complex
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Pyroxene Major mineral (>10%)
Gangue mineral Plagioclase Major mineral (>10%)
Gangue mineral Biotite Subordinate mineral (1-10%)
Gangue mineral Olivine Subordinate mineral (1-10%)
Gangue mineral Spinel Accessory mineral (<1%)
Ore mineral Titanomagnetite Major mineral (>10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)
Ore mineral Ilmenite Subordinate mineral (1-10%)
Ore mineral Chalcopyrite Accessory mineral (<1%)
Ore mineral Marcasite Accessory mineral (<1%)
Ore mineral Bravoite Accessory mineral (<1%)
Ore mineral Pentlandite Accessory mineral (<1%)
Ore mineral Pyrite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Gabbro Intrusive
Original rock :Gabbro
Wall rock Migmatitic gneiss
Metamorphic facies :Granulite
Wall rock Banded supracrustals Extrusive
Metamorphic facies :Granulite

Information(s) in free text format
Free text
The Selvåg Fe-Ti-V deposit occurs within the Eidet-Hovden intrusion, which is a layered basic igneous complex of Proterozoic age (this description is entirely based on Priesemann & Krause 1985). The deposit occurs in the eastern part of the Eidet-Hovden intrusion, which covers the Eidet-Hovden peninsula in the northwestern part of Langøy. The mineralisation is located 800m from the shore of Malnesfjord within Selvågdal about 3 km north of Eidet. The area is accessible either on tracks from the south or by boat. Investigations of the Selvåg deposit started in the end of the 19th century (J.Vogt 1910, 1918). The company Christiania Spigerverk did a relatively extensive surface sampling in 1935 (Smith 1935). The investigations were carried on in 1956 by the core-drilling of 7 holes, altogether 1000 m (Øverlie 1959). Various geological investigations of the deposit area, were carried out by Heier (1960), Ormaasen (1976) and Malm & Ormaasen (1978). In 1978 Elkem started a research project in collaboration with Clausthal university (Germany). This study comprised detailed geological investigations and geophysics (ground magnetics), and detailed studies of the available cores. The results of these studies have been presented in several unpublished reports as well as in Priesemanns dr. thesis (see references in Priesemann & Krause 1985). The Eidet-Hovden intrusion is a layered basic igneous complex. The emplacement of the intrusion is related to the plutonic stage of the Lofoten-Vesterålen province (probably ca. 1800 Ma). The body crystallised under granulite facies conditions within a series of migmatitic gneisses and banded supracrustals. A SE-oriented compression produced a number of dislocation planes as well as a major reverse slip fault (Trihyrna-Selvåg fault). The intrusion has a triangular outcrop of approx. 20 km2. Gabbroic cumulates form an outer rim of the complex. The gabbro series is on average 2800 m thick, with enrichments of Fe-Ti ore in several horizons. The Selvåg deposit is related to one of these horizons, and consists of two ore bodies separated by the Trihyrna-Selvåg fault. The deposit occurs within a heterogeneous sequence composed of uniform to modally layered cumulates of three types: (1) Low-grade ore comprising uniform cumulates with disseminated Fe-Ti oxides. (2) Medium-grade ore forming a heterogeneous sequence. The content of oxides varies from roughly 8 to 20 vol.%. (3) High-grade ore with roughly 30 vol.% oxides. The northern ore has the most interesting ore reserves. It has a N-S extent of approx. 500m, an average width of 200 m and covers about 100.000 m2. Its main part crops out on the eastern slope of Selvågtind. The ore body is extensively faulted. The most significant concentrations of Fe-Ti oxides is represented by a strongly layered lower unit of predominantly high-grade ore with thickness varying from 60 to 100 m with a lateral length of 400 m. The overlying sequence is characterised mainly by poor-mineralised gabbro and medium-grade ore. The Selvåg mineralisation is associated with gabbros, olivine gabbros, pyroxenite and olivine pyroxenite. The rocks are commonly medium-grained (1.5-2.0 mm) with cumulate textures. The main mineral phaces are plagioclase (labradorite), Ca-rich pyroxene (augite to ferroaugite) and Fe-Ti oxides (titanomagnetite and ilmenite). The minor constituents include olivine, orthopyroxene (bronzite), Ti-biotite, hercynitic spinel and sulfides. Titanomagnetite is the main constituent in the ore with in average 82 vol.% of the opaque minerals, while ilmenite makes up 12 vol. % of the opaque and sulfides (mainly pyrrhotite) makes up the remaining 6 vol.%. Titanomagnetite contains in average 0.62 wt.% V2O3 while ilmenite contains 2.2 wt.% MgO. The ore reserves are estimated at 44 million tons of probable ore averaging 25% Fe, 2.5% Ti and 0.15% V with a possibility of continuation at depth (Øverlie 1956). Selvåg is therefore primarily an ore of vanadiumbearing titanomagnetite with titanium of minor importance as a possible by-product.

Photo(s) from the Deposit area:
Photo no. 1 showing 2,5x"
Photo no. 2 showing 10x"
Photo no. 3 showing 50x"

Bibliography:
From NGU's Reference Archive:
Geis, H.P.; Øverlie, O. , 1970
Selvåg - feltet.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 4861;158 pages

Lund, H. , 1907
Selvåg Jernfelt Bø i Vesterålen, Nordland.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 118;11 pages
Abstract:
Det er gjort en inngående vurdering av forekomsten. Rapporten gir oversikt over beliggenhet, adkomst og topografi, geologi, malmkvalitet og mengder, samt kapitalbehov og salgsverdi av produktet ved en eventuell drift. Rapporten inneholder også forslag for undersøkelse. Det konkluderes med at kvaliteten av malmen kunne gi et godt jern eller stål. Med hensyn til feltes størrelse, den stigende etterspørsel etter jern samt tallrike forbedringer i utvinnings-og oppredningsmetoder er det å tro at forekomsten kan drives.

Lund, H. , 1906
Selvåg felt. Plankart over feltet 1:2 000.
;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 1170

Lundh, H. , 1906
Selvåg felt. Profiler
;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 2096

Lundh, H. , 1906
Selvåg felt. Røsk i dagen A+B, 1:2 000
;Norges geologiske undersøkelse;KART;Bergarkivet; No.K 2095

Priesemann, F.D.; Krause, H. , 1985
The Selvåg deposit: a proterozoic magmatic Fe-Ti-V occurrence on Vesterålen, Northern Norway.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.402;51-64 pages
Abstract:
The Selvåg Fe-Ti-V deposit is hosted by the Eidet-Hovden layered intrusion situated within the Precambrian Lofoten-Vesterålen province. The igneous complex is of olivine-tholeiitic affinity and shows a strong iron-enrichment trend. The deposit lies within the upper ore horizon (UZc) of the layered series. Faulting has resulted in two separate heterogenous ore bodies characterized by strong modal layering. The ore consists of titanomagnetite with ulvøspinel and ilmenite lamellae, ilmenite and sulphides. The mode of titanomagnetic relative to ilmenite show little variation in their compositions. The northern ore body contains the most valuable ore reserves with 44 Mt probable ore with about 25 wt.% V. The southern lens is of minor economic importance.

Vogt, J.H.L. , 1918
Selvåg jernmalmforekomster Bø i Vesterålen, Nordland.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 119;10 pages
Abstract:
Det er gjort vurdering av jernmalmfeltet med henblikk på gruvedrift. Rapporten vurderer geologi, malmens beskaffenhet og mengde, om brytning av malmen i dagbrudd, transportforhold og transporttype. Rapporten inneholder også kostnadsoverslag.

Ormaasen, Dag Eigil , 1976
Petrography, Geochemistry and Petrology of the Mangeritic Rocks in Lofoten, Vesterålen.
;UiO Geografisk inst.;AVHANDLING

Malm, O.A.; Ormaasen, D.E. , 1978
Mangerite-charnockite intrusives in the Lofoten-Vesterålen area, North Norway: petrography, chemistry and petrology.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.338;83-114 + pages
Abstract:
About 2100 km2 of the Lofoten-Vesterålen granulite facies terrain consist of intermediate-acidic intrusive rocks of the mangerite-charnockite suite, emplaced 1900-1700 m.y. B.P., closely following a granulite-facies regional metamorphism. The amjor primary magmatic mineral assemblage of the rocks is mesoperthite + plagioclase + clinopyroxene + orthopyroxene (or pigeonite) + Fe-Ti-oxides +- quartz. The most iron-rich types have fayalitic olivine in addition to or instead of orthopyroxene (or pigeonite). The rocks are characterized by high alkalies and hiigh Fe/Mg-ratios. Th- and U-contents range from 0.5-11.5 ppm and 0.1-1.5 ppm, respectively, R/Rb-ratios from 1600-250. Major and trace element compositions show continuous variation with increasing SiO2 content. Mangerites show distinct positive Eu-anomalies, quartz-mangerites no or very small Eu-anomalies and charnockites distinct negative anomalies. A genetic relation through fractional crystallization of feldspar and pyroxenes is suggested for the members of the suite. Based on the bimodality of Fe/Mg-ratios the existence of at least two parallel differentiation series is proposed. Mineral data limit the PT-conditions of magmatic crystallization for the rocks to T~1000 deg. Cels. and P~11 kb (corresponding to a depth of 35-45 km). Adding this depth to the present-day depth to Moho (25-35 km) gives an estimate of the crustal thickness of 60-75 km at the time of crystallization.

Heier, Knut S. , 1960
Petrology and geochemistry of high-grade metamorphic and igneous rocks on Langøy, northern Norway.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.207;1-246 + f pages
Abstract:
The rocks on Langøy have been considered as representing an igneous rock series including metamorphic sedimentary rocks of "Caledonian type". The present work shows that they are for the most part high-grade metamorphic rocks which are intruded by a few post metamorphic igneous rocks. The petrography of the rocks is discussed. They range in composition from ultrabasic to granitic. Rocks in the 50-60 per cent silica range predominate areally. The metamorphic rocks on Lagerøy are divided into: the banded series, the charnokite border series, the amphibolite facies veined gneises, porphyroblastic monzonitic granulites, old red granites, red augengneisses (ofmonzonitic composition), metasedimentary rocks, and diaphtoritic gneisses. The Eidet-Hovden intrusion, young red granites and the Bø gabbro are considered as post metamorphic igneous intrusions. The position of the anorthosite with associated monzonite east of Eidsfjorden is doubtful but may be related to the Eidet-Hovden intrusion. The metamorphic facies and mineral equilibria are discussed. A metamorphic boundary which separates amphibolite facies rocks to the east from granulite facies rocks to the west coincides along the strike with the observed thrust plane under the anorthosite east of Eidsfjorden.

References not to be found in NGU's Reference Archive.:
Smith, S. 1935: Selvåg Rapporter I til III. Interne rapporter, Elkem A/S.

Fieldsamples
Sample No. Sample type Miscellanrous
NO0114.01 Bedrock
Sampler: Mathiesen,C.O./...Stored: Løkken
Comment: Massiv jernmalm med noe kis.
No. of registrated element analyses = 1
NO0114.02 Bedrock
Sampler: Mathiesen,C.O./...Stored: Løkken
Comment: Massiv jernmalm med noe kis.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:


Analyse Results
from
Deposit Area 1867 - 004 Selvåg

Element analyses

( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)
Sample No. Sample Type Cu* Zn* Pb* Co* Ni* Ag* Au#
NO0114.01 Bedrock 333 -16 -41 71 121 -8.2 3.0
NO0114.02 Bedrock 373 22 -41 68 99 -8.2 2.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sn* Sb* Bi*
NO0114.01 3.0 3.0 -20 -8.2 32 -8.20 -20 -20 -20
NO0114.02 3.0 3.0 -20 -8.2 23 -8.20 -20 -20 -20
------------------
Sample No. S% V* Cr* Mn* Fe% Th* U* Sr* La*
NO0114.01 .31 631 10 512 11.30 -30.00 -30.00 -16.4 -8.20
NO0114.02 .27 701 12 299 11.30 -30.00 -30.00 -16.4 -8.20
------------------
Sample No. B*
NO0114.01 -41
NO0114.02 -41


The fact sheet was created on 28.03.2024

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