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THE ORE DATABASE
Occurence 1833 - 016 Knusermalmen
(Object Id: 2277)
(Last updated: 25.02.2005)
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: 479082 m. North: 7365147 m.
Longitude: 14.5316890 Latitude: 66.4051380
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Pitting Reserves: 950 thousand tons
Operating method: Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Fe-mag. 20 % 26.03.1996
Fe-total 35.5 % 26.03.1996
P 0.2 % 26.03.1996

Operations
From - To Activity Comments
1960 - 1960 Geophysics Company/Institution :NGU/Rana Gruber
1963 - 1963 Geology Company/Institution :Rana Gruber (K. Ryssdal)
1976 - 1976 Geology Company/Institution :Rana Gruber (U. Søvegjarto)

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: 120 / 40 Direction: 270
Plunge: 20
Stratigraphic classification of host rock
Era: Proterozoic Period: Neoproterozoic
Province: Caledonides
Geotec.unit: Rødingsfjell Nappe Complex
Tectonic complex: Ramnålidekket
Igneous complex:
Group: Ørtfjellgruppen Formation: Dunderlandformasjonen

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Biotite Subordinate mineral (1-10%)
Gangue mineral Dolomite Subordinate mineral (1-10%)
Gangue mineral Oligoclase Subordinate mineral (1-10%)
Gangue mineral Hornblende Subordinate mineral (1-10%)
Gangue mineral Apatite Subordinate mineral (1-10%)
Gangue mineral Muscovite Subordinate mineral (1-10%)
Gangue mineral Chlorite Subordinate mineral (1-10%)
Gangue mineral Epidote Subordinate mineral (1-10%)
Gangue mineral Calcite Subordinate mineral (1-10%)
Ore mineral Hematite Major mineral (>10%)
Ore mineral Magnetite Major mineral (>10%)

Lithology:
Relationship Rock Origin
Wall rock Lys glimmerskifer Extrusive
Original rock :Rhyolite
Metamorphic facies :Amphibolite
Wall rock Dolomittmarmor Sedimentary
Original rock :Dolomite
Metamorphic facies :Amphibolite
Wall rock Kalkspatmarmor Sedimentary
Original rock :Limestone
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Foliation Strike/Dip :120 / 40 Syn-mineralisation ;...Effect :None
Host rock Primary layering Strike/Dip :270 / 20 Syn-mineralisation ;...Effect :None

Information(s) in free text format
Free text
Knusermalmen er en bladet hematittmalm/finkornet magnetittmalm. Den ligger under jord og ble geologisk kartlagt i 1963 under Rana Grubers anleggstid. Det er malmsnitt i a) jernbanetunnel mellom malmknuser og malmsilo, Storforshei. b) transport-tunnel mellom malmknuser og malmsilo, Storforshei. Dessuten har man under anleggstiden av kalkknuser/kalkomlastest. i 1976 fått et malmsnitt i dagen ved: c) Kalkomlastestasjonen. Malmen er vanligvis 5-7 m tykk (men også 3-9 m) og har en 2-5 m tykk kalk i hengen og dolomitt i liggen. Ifølge magnetiske bakkemålinger har malmen 900 m strøklengde. Tonnasjen kan regnes 60 m nedover langs malmfallet: 900m x 5m x 60m = 270000 m3 sp.v. 3,5 gir 945000 t.

Bibliography:
From NGU's Reference Archive:
Aalstad, I. , 1964
Tyngdemåling Ørtvann- og jernbanetunnel Storforshei/Nord-Rana
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.543;4 pages
Abstract:
Som et ledd i forberedelsene til drift av Ørtvannforekomsten er det drevet en tunnel fra Ranaelva inn under Ørtvann for å tappe ut dette, og videre en jernbanetunnel i forbindelse med siloanlegg syd for Stillvann.

Søvegjarto, U.; Marker, M.; Gjelle, S. , 1989
Storforshei. Berggrunnskart; Storforshei; 20274; 1:50 000; trykt i farger;
;Norges geologiske undersøkelse;KART

Name of Locality: NV-ende
(Object Id: 3799 16,01,00)
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: 478682 m. North: 7365497 m.
Longitude: 14.5226740 Latitude: 66.4082500
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Name of Locality: Jernbanestoll
(Object Id: 3800 16,02,00)
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: 479132 m. North: 7365097 m.
Longitude: 14.5328160 Latitude: 66.4046930
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Name of Locality: Under adm.bygg
(Object Id: 3802 16,03,00)
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: 479282 m. North: 7365047 m.
Longitude: 14.5361830 Latitude: 66.4042540
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Name of Locality: SØ-ende
(Object Id: 3801 16,04,00)
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: 479432 m. North: 7364997 m.
Longitude: 14.5395490 Latitude: 66.4038150
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:

The fact sheet was created on 21.12.2025
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