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THE ORE DATABASE
Deposit 1833 - 040 Ørtfjell
(Object Id: 2718)
(Last updated: 15.03.2024)
Belongs to the Province: Dunderlandsdalen jern
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 485626 m. North: 7366650 m.
Longitude: 14.6780210 Latitude: 66.4189890
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Importance
Raw material meaning: National Importance (reg. 09.02.2017)

Resources and production
Activity: Mining Reserves: 388000 thousand tons
Operating method: Open pit and underground mining Historical production: 77800 thousand tons


Products
Element/product Crude ore grade or quality Reg. date
Fe-total 34 % 02.11.1992

Operations
From - To Activity Comments
1952 - 1981 Geology Company/Institution :Rana Gruber
1952 - 1986 Core drilling Company/Institution :Rana Gruber
1975 - 1992 Regular production Company/Institution :Rana Gruber

Mineralization
Era: Proterozoic Period: Neoproterozoic
Genesis: Sedex Form: Layer
Main texture: Banded Min. distribution: Massive (>50 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration:
Strike/Dip: 240 / 90 Direction: 245
Plunge: 60
Stratigraphic classification of host rock
Era: Proterozoic Period: Neoproterozoic
Province: Caledonides
Geotec.unit: Rødingsfjell Nappe Complex
Tectonic complex: Midtre allokton
Igneous complex:
Group: Ørtfjell Formation: Dunderland

Mineralogy
Relationship Mineral Amount
Gangue mineral Albite
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Biotite Subordinate mineral (1-10%)
Gangue mineral Apatite Subordinate mineral (1-10%)
Gangue mineral Muscovite Subordinate mineral (1-10%)
Gangue mineral Amphibole Subordinate mineral (1-10%)
Gangue mineral Calcite Subordinate mineral (1-10%)
Gangue mineral Potassic feldspar Subordinate mineral (1-10%)
Gangue mineral Dolomite Subordinate mineral (1-10%)
Gangue mineral Epidote Subordinate mineral (1-10%)
Gangue mineral Chlorite Subordinate mineral (1-10%)
Gangue mineral Garnet Accessory mineral (<1%)
Ore mineral Hematite Major mineral (>10%)
Ore mineral Magnetite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Unknown Carbonate mica schist Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Amphibolite
Unknown Mica schist Sedimentary
Original rock :Greywacke
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Unknown Fold axis Strike/Dip :240 / 60 Syn-mineralisation ;...Effect :None
Unknown Foliation
Unknown Primary layering

Information(s) in free text format
Free text
The Dunderlandsdalen iron district comprises a number of smaller and larger hematite-magnetite ore deposits, of which the Ørtfjell deposit is currently in production. Other mines which now are closed are: Finnkåteng (produced 10.7 Mt with 37.4 % Fe), Vesteråli (14.6 Mt with 35.3 % Fe, 22 Mt reserves), Ørtvann (17.6 Mt with 33 % Fe, 26 Mt reserves). In addition is Ørtfjell Øst an important deposit, which has not been exploited (33 Mt reserves with 33.6 % Fe). Altogether c. 100 Mt of iron ore, grading 33-37 % Fe, has been produced during the last 100 years. The immediate host rocks of the mineralisation are mica schists of various types, but the schists themselves occur in a sequence dominated by dolomitic and calcitic marble units several hundred metres thick. Two main ore horizons, from a few metres to 30 m thick, are found: 1) an upper magnetite-hematite ore, containing 0.15–0.3 % P, and 2) a lower apatite-bearing magnetite ore containing 0.8–1 % P. Each unit contains several ore bodies, the most important ones belonging to the upper unit. These include the Ørtfjell deposit, by far the largest in the district, which includes the Kvannevann mine, currently producing roughly 2.1 Mt/a. The total tonnage of the ore body is 417 Mt with 34 % Fe. The mt:hm ratio averages 2:1 at Ørtfjell, but ranges down to 1:10 in other deposits within the upper unit. Where hematite is dominant the gangue minerals are quartz, calcite, epidote and biotite, and where magnetite is dominant the gangue minerals are quartz, calcite, biotite, hornblende and grunerite. Bands of pyrrhotite up to 1 m thick are found at the margins of the ores and minor amounts of pyrite are common. The upper unit is also enriched in manganese, commonly containing 5–10 % MnO.

Bibliography:
From NGU's Reference Archive:
Sakshaug, G.F. , 1962
Magnetisk Undersøkelse 1. Ørtvann - Ørtfjell 2. Ømmervannfeltet 3. Gløsen Øst.
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.324;20 pages

Sindre, Atle , 1980
Tyngdemålinger ved Ørtfjell
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1764;6 pages

References not to be found in NGU's Reference Archive.:
Søvegjarto, U. 1986: Ørtfjell jernmalmfelt. Ny geologisk 1:1000 dagkartlegging 1973-81. Int. rapp. Rana Gruber AS.


Søvegjarto, U. 1988: Manuskript angående jernmalmer i Norge (7 kapitler). Kapitlet om "Rana Iron Ore Province". NGU og Rana Gruber.

Fieldsamples
Sample No. Sample type Miscellanrous
NO0597.01 Bedrock
Sampler: Søvegjarto, U./...Stored: Løkken
Comment: Fe-malm.
No. of registrated element analyses = 1
NO0597.02 Bedrock
Sampler: Søvegjarto, U./...Stored: Løkken
Comment: Fe-malm.
No. of registrated element analyses = 1
OF-1 Block
Sampler: J.S. Sandstad
Comment: Hematite-quartz-epidote banded ore
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
OF-2 Block
Sampler: J.S. Sandstad
Comment: Hematite-carbonate banded ore
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Prøvepunkt
(Object Id: 39492 40,00,01)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 485410 m. North: 7366600 m.
Longitude: 14.6731730 Latitude: 66.4185390
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe


Fieldsamples
Sample No. Sample type Miscellanrous
Rana-1 Bedrock
Sampler: Bjerkgård/Raaness/...Stored: Løkken
Comment: Pyrittbåndet magnetittmalm
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Prøvepunkt
(Object Id: 39493 40,00,02)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 485454 m. North: 7366823 m.
Longitude: 14.6741550 Latitude: 66.4205330
Show on map
Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe


Fieldsamples
Sample No. Sample type Miscellanrous
Rana-2 Bedrock
Sampler: Bjerkgård/Raaness/...Stored: Løkken
Comment: Kvarts-kalkbåndet hematitt
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Nordmalmen
(Object Id: 6893 40,01,00)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 485730 m. North: 7366899 m.
Longitude: 14.6803070 Latitude: 66.4212360
Show on map
Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Mining Reserves:
Operating method: Open pit mining Historical production:


Name of Locality: Midtmalmen
(Object Id: 6894 40,02,00)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 486428 m. North: 7366882 m.
Longitude: 14.6959570 Latitude: 66.4211110
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Mining Reserves:
Operating method: Open pit mining Historical production:


Name of Locality: Eriksmalmen
(Object Id: 6895 40,03,00)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 486432 m. North: 7367062 m.
Longitude: 14.6960380 Latitude: 66.4227210
Show on map
Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Mining Reserves:
Operating method: Open pit mining Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
E-1 Dump
Sampler: Terje Bjerkgård
Comment: Båndet hematittmalm
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
E-2 Dump
Sampler: Terje Bjerkgård
Comment: Båndet hematittmalm, fosforholdig
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
E-3 Dump
Sampler: Terje Bjerkgård
Comment: Båndet hematitt-Mn-karbonat malm
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Kvannevannsmalmen
(Object Id: 6896 40,04,00)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 488004 m. North: 7367376 m.
Longitude: 14.7312270 Latitude: 66.4256110
Show on map
Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
KV-1 Dump
Sampler: Terje Bjerkgård
Comment: Foldet hematittmalm
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
KV-2 Dump
Sampler: Terje Bjerkgård
Comment: Kvartsbåndet hematittmalm
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
KV-3 Dump
Sampler: Terje Bjerkgård
Comment: Manganbåndet hematittmalm
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Hyttmalmen
(Object Id: 6897 40,05,00)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 487230 m. North: 7367100 m.
Longitude: 14.7138910 Latitude: 66.4230960
Show on map
Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Mining Reserves:
Operating method: Open pit mining Historical production:


Analyse Results
from
Deposit Area 1833 - 040 Ørtfjell

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#
E-1 Dump 6 17 1 8 10 -.1 1.7
E-2 Dump 5 7 2 8 4 -.1 1.9
E-3 Dump 40 24 1 244 32 -.1 .7
KV-1 Dump 31 17 2 8 7 -.1 2.2
KV-2 Dump 78 32 1 9 8 -.1 4.1
KV-3 Dump 11 77 4 271 432 -.1 -.5
NO0597.01 Bedrock 37 92 54 -1 48 -.3 4.0
NO0597.02 Bedrock 18 73 20 -1 16 -.3 -2.0
OF-1 Block 7 7 2 3 6 1.8
OF-2 Block 8 10 2 4 4 2.3
------------------
Sample No. Pt# Pd# Rh# As* Cd* Ba* Mo* Sn* Sb*
E-1 5 -.1 147 0.30 -1 -0
E-2 11 -.1 82 -0.10 -1 -0
E-3 12 -.1 209 0.30 -1 -0
KV-1 2 -.1 534 0.20 -1 -0
KV-2 2 -.1 415 0.20 -1 -0
KV-3 7 -.1 983 -0.10 1 -0
NO0597.01 -3.0 -3.0 -5.0 -2 1.2 2 2.00 -2
NO0597.02 -3.0 -3.0 -5.0 -2 1.1 10 3.00 -2
OF-1 1 61 0.50 -1
OF-2 -1 18 0.20 -1
------------------
Sample No. Bi* Se* Ga* S% V* Cr* Mn* Fe% Th*
E-1 -0 -0.50 3.20 78 1.40
E-2 -0 -0.50 1.70 57 0.60
E-3 -0 -0.50 13.10 -8 4.50
KV-1 -0 -0.50 4.00 77 3.40
KV-2 -0 -0.50 4.70 89 2.60
KV-3 -0 -0.50 17.60 50 6.40
NO0597.01 3 -.01 13 9 311 19.12 -2.00
NO0597.02 7 -.01 18 11 1348 18.10 -2.00
OF-1 6.30 52 1.50
OF-2 2.80 50 1.30
------------------
Sample No. U* W* Rb* Sr* Y* Zr* Nb* Ta* Cs*
E-1 0.30 1 19.6 37.9 24.1 35 2.10 0.10 1.50
E-2 -0.10 -1 8.8 228.5 20.1 15 0.70 0.10 0.30
E-3 -0.10 -1 19.6 405.3 28.4 118 10.90 0.50 0.90
KV-1 0.40 1 36.2 246.7 40.1 72 3.50 0.20 1.00
KV-2 0.50 1 49.0 117.2 25.5 73 3.50 0.20 3.20
KV-3 0.90 1 41.5 311.9 24.8 153 10.80 0.70 1.10
NO0597.01 -5.00 -2 50.0
NO0597.02 -5.00 2 96.0
OF-1 0.50 -1 2.4 321.2 29.4 30 1.70 -0.10 -0.10
OF-2 0.40 -1 5.1 210.4 19.0 47 2.80 0.20 -0.10
------------------
Sample No. La* Ce* Pr* Nd* Sm* Eu* Gd* Tb* Dy*
E-1 9.80 19.20 2.21 9.50 1.96 0.47 2.08 0.41 2.77
E-2 4.50 8.90 1.16 5.50 1.38 0.31 1.54 0.29 2.12
E-3 21.30 40.00 4.96 20.70 3.92 0.94 4.33 0.74 5.04
KV-1 16.10 33.90 4.44 20.10 4.18 0.94 4.47 0.76 5.10
KV-2 12.30 25.80 2.94 12.10 2.71 0.73 2.89 0.52 3.22
KV-3 27.00 52.90 6.20 24.60 5.11 1.11 4.69 0.74 4.28
NO0597.01 -1.00
NO0597.02 1.00
OF-1 8.90 19.20 2.37 10.70 2.20 0.47 2.42 0.44 3.13
OF-2 7.50 16.30 2.06 8.20 1.80 0.41 1.84 0.32 2.34
------------------
Sample No. Ho* Er* Tm* Yb* Lu* B* Be* Hf* Hg*
E-1 0.67 2.35 0.42 2.57 0.41 -1 0.80 -0
E-2 0.56 1.91 0.29 1.72 0.33 -1 0.30 -0
E-3 1.00 2.96 0.48 3.15 0.51 3 2.90 -0
KV-1 1.24 4.03 0.54 3.36 0.67 1 1.90 -0
KV-2 0.71 2.48 0.45 2.94 0.48 1 1.80 -0
KV-3 0.91 2.64 0.43 2.99 0.46 3 4.10 -0
NO0597.01 -3
NO0597.02 -3
OF-1 0.82 2.76 0.44 2.95 0.53 0.80
OF-2 0.53 1.70 0.28 1.76 0.28 0.90
------------------
Sample No. Tl*
E-1 -0
E-2 -0
E-3 0
KV-1 -0
KV-2 0
KV-3 0
NO0597.01
NO0597.02
OF-1
OF-2

Oxide analyses
( All values are in % )
Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO
E-1 Dump 24.02 2.21 0.13 68.21 0.10 1.06 1.25
E-2 Dump 42.41 1.03 0.06 50.44 0.28 0.50 2.60
E-3 Dump 40.84 6.75 0.50 25.88 9.94 2.84 5.42
KV-1 Dump 24.81 4.67 0.31 61.48 0.19 1.40 2.61
KV-2 Dump 26.01 4.73 0.34 62.11 0.06 1.71 1.82
KV-3 Dump 53.60 11.01 0.65 8.21 7.73 2.42 5.10
OF-1 Block 30.66 2.71 0.11 57.79 0.10 1.00 3.58
OF-2 Block 30.07 1.92 0.12 52.37 0.23 2.65 5.74
Rana-1 Bedrock 48.14 6.70 0.42 30.18 0.12 2.07 5.40
Rana-2 Bedrock 20.30 3.30 0.19 30.37 0.60 7.09 16.44
------------------
Sample No. Na2O K2O P2O5 Loss Sum
E-1 0.20 0.62 0.75 0.55 99.00
E-2 0.08 0.28 0.55 1.87 100.00
E-3 4.39 0.49 0.32 2.87 100.00
KV-1 0.33 1.19 0.71 2.17 100.00
KV-2 0.04 1.52 0.56 1.00 100.00
KV-3 3.75 1.15 0.20 5.49 99.00
OF-1 0.66 0.09 0.47 2.77 100.00
OF-2 0.31 0.16 0.18 6.56 100.00
Rana-1 0.35 0.14 0.55 5.32 99.00
Rana-2 0.72 0.03 0.42 20.12 100.00

The fact sheet was created on 06.05.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
Copyright © 2024 Geological Survey of Norway