English version
MALMDATABASEN
Forekomstområde 1111 - 008
(Sist oppdatert 05.des.2025)

Navn på deposit area : Storgangen
(Objekt Id : 1111,008,00,00)
Lokalisering
Fylke : Rogaland (11) Kommune : Sokndal (1111)
Kart 1:50000: Sokndal (1311-4) Kart 1:250000: Mandal
Markeringspunkt: Lengdegrad: 6.3428180 Breddegrad: 58.3621470
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-koord: 344550 m. Y-koord: 6472100 m.
Materialtype
Hovedtype: Jernmetaller (Fe, Mn, Ti) Subtype: Jern-titan
Element(s): Fe-Ti
Production
Activity: Gruvedrift Reserves: 60000 thousand tons
Prod. method: Dag- og underjordsdrift Production: 10000 thousand tons
Prod. status: Nedlagt Volume of dump: 15000000 m3
Resource estimat. standard: Ikke standardisert

Betydning
Offentlig: International Importance (reg. 18.05.2015)
Economical: Meget viktig , (Confirmed 18.mai.2015 by Henrik Schiellerup)

Products
Element/product Crude ore grade or quality
TI 11 %
TIO2 18 %

Operations
From - To Activity Comments
1902 - 1964 Regular production Company/Institution :Titania A/S
Storgangen was mined by Titania A/S from 1902 to 1964. The mine produced a total of more than 10 Mt. of ore containing 18-19% TiO2, accounting for 11-13% of the world production of TiO2 during that periode (Krause m. fl. 1985).

Mineralization
Era: Proterozoic Period: Neoproterozoic
Dating: Method:
Genesis: Ortomagmatisk Form:
Main texture: Båndet Min. distribution: Semi-massiv
Main grain size: Middelskornet (1-3 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: Rogaland anorthosite province %P2O5(Ore):
Host rock: Norite %MgO(Ilm):
Main Ti mineral: Ilmenite %V2O3(Mt):
ppm U (Rutile):
Stratigraphic classification of host rock
Era: Proterozoic Period: Neoproterozoic
Province: South Norwegian Basement Province
Geotec.unit:
Tectonic complex:
Igneous complex: Egersund Anorthosite 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%)
Ore mineral Ilmenite Major mineral (>10%)
Ore mineral Titanomagnetite Major mineral (>10%)
Ore mineral Pyrrhotite Subordinate mineral (1-10%)
Ore mineral Pyrite Subordinate mineral (1-10%)
Ore mineral Chalcopyrite Accessory mineral (<1%)
Ore mineral Pentlandite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Magnetitt-ilmenitee-rik noritt Intrusive
Original rock :Norite
949 (-7\+7) mill. years;..Method:U/Pb
Wall rock Anortositt Intrusive
Original rock :Anorthosite

Opplysning(er) i fritekstformat
Fri tekst
Storgangen er en 4 km lang og opp til 50 m mektig ØNØ-VSV'lig gangformet norittisk malmkropp i Åna-Sira anorthosittmassivet. Forekomsten er tolket å ha intrudert og størknet før den siste deformasjonen av anortositten (jfr. beskrivelse i Duchesne 2001) Malmkroppen er gjennomgående konkordant lagdelt i cm til m skala. Lagdelingen faller mot NNV med en vinkel varierende mellom 40 og 60 grader. De viktigste mineraler er plagioklas, Ca-fattig og Ca-rik pyroksen, apatitt, titanomagnetitt, ilmenitt, Cr-holdig spinell, diverse sulfidmineraler og baddeleitt. Forekomsten er generelt rik på oksyder over det hele, dog rikest i den nedre halvdel av stratigrafien. Aller nederst er ilmenitten en hemo-ilmenitt (Hem13) sammen med magnetitt og pleonaste spinell. MgO-innholdet i ilmenitt varierer fra 3-3.5% MgO nederst i stratigrafien til ca. 2% MgO mot toppen. Storgangen ble drevet av Titania fra 1916 til 1964. Det ble tilsammen produsert over 10 millioner tonn malm med i gjennomsnitt 18-19% TiO2. Dette tilsvarer 11-13% av verdensproduksjonen av ilmenitt i den samme perioden (Krause m. fl. 1985).

Bibliography:
From NGU's Reference Archive:
Paludan, Johanne , 1995
Structural evolution of the Bjerkreim-Sokndal layered intrusion, SW Norway: micro to macro scale studies.
;AVHANDLING

Paludan, Johanne; Hansen, Ulla B.; Olesen, Niels Ø. , 1994
Structural evolution of the Precambrian Bjerkreim-Sokndal intrusion, south Norway
;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.74 (4);185-198 pages
Abstract:
The structures of the northwestern part of the Precambrian Bjerkreim-Sokndal intrusion are studied from micro- to macro-scale. Meso-scale structures are dominated by (1) modal layering of igneous origin (Sg) and (2) prominent linear and planar fabrics (L1/S1), defined by the shape-preferred orientation of mineral aggregates. In most places So and S, are parallel, and together they define an isoclinal syncline with a southeastwards plunging fold axis. The linear fabric (L1) is subparallel to the fold axis in the hinge zone and converges towards this zone in the limbs. The intensity and type of fabric vary across the fold. In the hinge zone the L-fabric is dominant, whereas the rocks in the limbs display a combined S- and L-fabric. The intensity of the fabric is closely tied with microstructural indications of plastic deformation, such as lattice bending and kinking, polygonization and recrystallization. All of this points to one major phase of solid state deformation. Estimates of the strain state are based on regional variations in the shape of olivine grains and aggregates from two igneous units.Extensions of up to 100% are observed in the hinge zone, and flattening around 40% is observed in the south- ern limb. Rheological considerations suggest that these are minimum values. In our interpretation, the deformation was the result of passive subsidence of the intrusive rocks, induced by gravitational instabilities in the area (inverse diapirism) A convergent flow pattern led to the formation of L-tec- tonites in the hinge zone and an additional shear component along the limb led to the formation of L/S-tectonites. A series of monzonorite dykes (the Lomland dykes) and a number of minor shear zones all post-date the major deformation. The dykes and shear zones may be coeval.

References not to be found in NGU's Reference Archive.:
Bolle, O., Diot, H. & Duchesne, J.C. 2000: Magnetic fabric and deformation in charnockitic igneous rocks of the Bjerkreim-Sokndal layered intrusion (Rogaland, Southwest Norway). J. Struct. Geol. 22, 647-667.


Duchesne, J.-C. 2001: The Rogaland Intrusive Massifs - an excursion guide. NGU Report 2001.029, 139 p. (ISBN 82-7385-198-2).

Fieldsamples
Sample No. Sample type Miscellanrous
160861 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160862 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160863 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160864 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160865 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160866 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160867 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160868 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160869 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160870 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160871 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160872 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160873 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
160874 Bedrock
Sampler :Eduardo Mansur/...Stored :Løkken/...Size(kg) :,25
Kommentar :Middels kornet magnetitt-ilmenittrik noritt.
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:

Navn på locality : Aursland skjerp
(Objekt Id : 1111,008,01,00)
Lokalisering
Fylke : Rogaland (11) Kommune : Sokndal (1111)
Kart 1:50000: Sokndal (1311-4) Kart 1:250000: Mandal
Markeringspunkt: Lengdegrad: 6.3745360 Breddegrad: 58.3610040
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-koord: 346400 m. Y-koord: 6471899 m.
Materialtype
Hovedtype: Jernmetaller (Fe, Mn, Ti) Subtype: Jern-titan
Element(s): Fe Ti P


Navn på locality : Sidegangen
(Objekt Id : 1111,008,02,00)
Lokalisering
Fylke : Rogaland (11) Kommune : Sokndal (1111)
Kart 1:50000: Sokndal (1311-4) Kart 1:250000: Mandal
Markeringspunkt: Lengdegrad: 6.3384820 Breddegrad: 58.3629550
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-koord: 344299 m. Y-koord: 6472199 m.
Materialtype
Hovedtype: Jernmetaller (Fe, Mn, Ti) Subtype: Jern-titan
Element(s): Fe Ti P


Navn på locality : Sidegangen 2
(Objekt Id : 1111,008,03,00)
Lokalisering
Fylke : Rogaland (11) Kommune : Sokndal (1111)
Kart 1:50000: Sokndal (1311-4) Kart 1:250000: Mandal
Markeringspunkt: Lengdegrad: 6.3452100 Breddegrad: 58.3644430
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-koord: 344699 m. Y-koord: 6472350 m.
Materialtype
Hovedtype: Jernmetaller (Fe, Mn, Ti) Subtype: Jern-titan
Element(s): Fe Ti P


Navn på locality : Sidegangen 2 forts.
(Objekt Id : 1111,008,04,00)
Lokalisering
Fylke : Rogaland (11) Kommune : Sokndal (1111)
Kart 1:50000: Sokndal (1311-4) Kart 1:250000: Mandal
Markeringspunkt: Lengdegrad: 6.3473330 Breddegrad: 58.3703280
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-koord: 344849 m. Y-koord: 6473000 m.
Materialtype
Hovedtype: Jernmetaller (Fe, Mn, Ti) Subtype: Jern-titan
Element(s): Fe Ti P


Navn på locality : Sidegangen 3
(Objekt Id : 1111,008,05,00)
Lokalisering
Fylke : Rogaland (11) Kommune : Sokndal (1111)
Kart 1:50000: Sokndal (1311-4) Kart 1:250000: Mandal
Markeringspunkt: Lengdegrad: 6.3537800 Breddegrad: 58.3641710
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-koord: 345199 m. Y-koord: 6472299 m.
Materialtype
Hovedtype: Jernmetaller (Fe, Mn, Ti) Subtype: Jern-titan
Element(s): Fe Ti P


Navn på sample point : test
(Objekt Id : 1111,008,05,01)
Lokalisering
Fylke : Rogaland (11) Kommune : Sokndal (1111)
Kart 1:50000: Sokndal (1311-4) Kart 1:250000: Mandal
Markeringspunkt: (Unavailable)
Materialtype
Hovedtype: Jernmetaller (Fe, Mn, Ti) Subtype: Jern-titan
Element(s): Fe Ti


Analyse Results
from
Forekomstområde 1111 - 008 Storgangen

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* As*
160861 Bedrock 215 188 11 133 339 .5 5
160862 Bedrock 350 254 10 180 505 .5 5
160863 Bedrock 166 207 13 142 337 .5 5
160864 Bedrock 145 176 12 124 296 .5 5
160865 Bedrock 163 154 19 146 321 .5 5
160866 Bedrock 116 148 10 111 256 .5 5
160867 Bedrock 27 57 1 29 63 .5 5
160868 Bedrock 148 211 11 165 293 .5 5
160869 Bedrock 101 190 9 126 207 .5 6
160870 Bedrock 368 232 14 204 519 .5 5
160871 Bedrock 162 172 8 127 344 .5 5
160872 Bedrock 299 242 13 187 447 .5 5
160873 Bedrock 249 193 12 161 343 .5 5
160874 Bedrock 147 209 9 160 265 .5 5
------------------
Sample No. Cd* Ba* Mo* Sn* Ga* V* Cr* Th* U*
160861 1.3 68 1.00 1 18.60 994 136 0.05 0.02
160862 1.8 36 1.00 1 18.40 1215 141 0.05 0.02
160863 1.5 49 1.00 1 15.40 1000 150 0.05 0.02
160864 1.7 101 1.00 1 22.80 1275 194 0.05 0.02
160865 1.6 50 1.00 2 16.20 1375 193 0.05 0.02
160866 1.2 120 1.00 1 20.80 906 111 0.05 0.02
160867 .5 310 1.00 1 25.60 221 23 0.10 0.06
160868 1.6 21 1.00 1 18.20 1120 85 0.05 0.02
160869 1.2 70 1.00 1 15.70 769 50 0.05 0.02
160870 1.9 13 1.00 1 17.40 1265 86 0.05 0.02
160871 1.0 84 1.00 1 14.60 741 171 0.09 0.02
160872 1.7 8 1.00 1 15.90 1190 81 0.06 0.02
160873 1.6 47 1.00 1 15.70 995 81 0.09 0.02
160874 1.5 41 1.00 1 15.00 936 79 0.07 0.02
------------------
Sample No. W* Rb* Sr* Y* Zr* Nb* Ta* Cs* La*
160861 1 0.8 179.0 2.7 116 14.50 1.10 0.01 0.80
160862 1 0.8 72.0 2.8 154 17.45 1.30 0.01 0.30
160863 1 0.7 121.0 2.6 121 14.95 1.10 0.01 0.90
160864 1 0.9 263.0 1.5 175 22.30 1.70 0.01 1.10
160865 1 0.3 123.5 1.4 214 29.20 2.10 0.01 0.50
160866 1 0.9 317.0 1.9 125 15.55 1.00 0.01 1.20
160867 1 3.2 744.0 3.9 45 4.09 0.20 0.01 4.60
160868 1 0.3 49.9 3.0 122 14.70 1.00 0.01 0.40
160869 1 0.6 182.0 3.2 94 10.55 0.40 0.01 0.70
160870 1 0.2 26.8 2.9 142 16.85 1.30 0.01 0.20
160871 1 0.9 218.0 6.6 128 17.15 1.20 0.03 1.70
160872 13 0.2 18.4 3.4 138 15.75 1.30 0.02 0.30
160873 4 0.6 115.5 3.5 137 15.15 1.20 0.02 1.30
160874 1 0.3 107.5 3.5 117 13.25 1.10 0.02 0.90
------------------
Sample No. Ce* Pr* Nd* Sm* Eu* Gd* Tb* Dy* Ho*
160861 1.80 0.27 1.10 0.26 0.30 0.38 0.07 0.45 0.11
160862 1.20 0.21 0.80 0.30 0.17 0.29 0.06 0.47 0.11
160863 1.80 0.23 1.00 0.26 0.19 0.35 0.06 0.35 0.10
160864 2.20 0.30 1.10 0.29 0.39 0.24 0.03 0.29 0.07
160865 1.20 0.14 0.60 0.09 0.20 0.19 0.03 0.25 0.07
160866 2.20 0.25 0.90 0.18 0.48 0.30 0.06 0.34 0.08
160867 10.40 1.21 5.90 1.32 1.18 1.20 0.16 0.90 0.15
160868 0.90 0.12 0.70 0.19 0.10 0.29 0.06 0.48 0.13
160869 1.70 0.19 0.90 0.29 0.28 0.38 0.08 0.43 0.11
160870 0.80 0.10 0.50 0.19 0.10 0.31 0.07 0.47 0.11
160871 3.80 0.51 1.90 0.54 0.39 0.76 0.19 0.93 0.26
160872 0.70 0.12 0.20 0.14 0.04 0.23 0.07 0.34 0.13
160873 2.30 0.33 0.90 0.26 0.17 0.32 0.10 0.38 0.14
160874 1.60 0.24 0.60 0.16 0.15 0.36 0.09 0.34 0.14
------------------
Sample No. Er* Tm* Yb* Lu* Li* Sc* Hf* Tl*
160861 0.32 0.06 0.45 0.07 10 30.00 3.43 10
160862 0.35 0.07 0.46 0.07 10 35.00 4.08 10
160863 0.25 0.05 0.43 0.06 10 33.00 3.33 10
160864 0.24 0.04 0.28 0.07 10 30.00 4.82 10
160865 0.17 0.04 0.27 0.06 10 40.00 6.32 20
160866 0.22 0.05 0.33 0.06 10 27.00 3.71 10
160867 0.40 0.05 0.31 0.04 10 7.00 1.20 10
160868 0.39 0.07 0.45 0.07 10 35.00 3.42 10
160869 0.34 0.06 0.51 0.07 10 28.00 2.49 10
160870 0.33 0.06 0.44 0.07 10 36.00 3.79 20
160871 0.77 0.13 0.78 0.12 10 32.00 3.89 10
160872 0.44 0.08 0.50 0.09 10 36.00 3.52 10
160873 0.44 0.08 0.48 0.08 10 32.00 3.59 10
160874 0.40 0.08 0.49 0.10 10 32.00 3.22 10

Oxide analyses
( All values are in % )
Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO
160861 Bedrock 30.20 6.82 16.60 35.40 0.22 10.10 2.41
160862 Bedrock 22.90 3.79 20.10 43.30 0.24 9.64 1.36
160863 Bedrock 25.50 5.39 19.10 37.90 0.23 9.30 1.88
160864 Bedrock 20.70 8.88 23.20 40.40 0.18 4.48 2.76
160865 Bedrock 13.55 4.57 29.80 44.80 0.22 5.45 1.46
160866 Bedrock 31.20 10.20 17.05 30.80 0.18 6.98 3.54
160867 Bedrock 50.00 22.30 3.44 8.62 0.06 2.62 7.67
160868 Bedrock 27.20 3.19 17.40 40.90 0.27 12.55 1.24
160869 Bedrock 35.80 7.07 12.55 31.00 0.22 11.75 2.65
160870 Bedrock 21.60 2.47 19.30 45.00 0.28 10.65 0.99
160871 Bedrock 34.70 7.25 13.70 29.20 0.24 11.15 3.02
160872 Bedrock 24.50 2.21 18.35 42.50 0.29 12.30 1.03
160873 Bedrock 28.10 4.87 16.85 37.50 0.27 11.30 1.86
160874 Bedrock 31.40 4.72 14.60 35.00 0.27 12.60 1.88
------------------
Sample No. Na2O K2O P2O5 Loss Sum
160861 1.03 0.17 0.02 -1.01 102.00
160862 0.36 0.08 0.01 -0.92 101.00
160863 0.72 0.13 0.02 -0.86 99.00
160864 1.41 0.22 0.02 -1.45 101.00
160865 0.66 0.11 0.01 -2.31 98.00
160866 1.82 0.27 0.03 -1.15 101.00
160867 4.32 0.69 0.11 0.17 100.00
160868 0.22 0.05 0.01 -1.61 101.00
160869 1.05 0.16 0.02 -0.35 102.00
160870 0.22 0.05 -0.01 -1.39 99.00
160871 1.21 0.22 0.04 -0.91 100.00
160872 0.12 0.03 0.01 -1.46 100.00
160873 0.64 0.13 0.03 -1.29 100.00
160874 0.61 0.11 -0.01 -1.32 100.00

Faktaarket ble generert 10.06.2026
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