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THE ORE DATABASE
Occurence 1833 - 025 Lomli
(Object Id: 2294)
(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: 483782 m. North: 7366147 m.
Longitude: 14.6367830 Latitude: 66.4143890
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Exploration Reserves: 30000 thousand tons
Operating method: Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Fe-mag. 13.3 % 28.03.1996
Fe-silicate 6.7 % 28.03.1996
P 0.55 % 28.03.1996
S 0.36 % 28.03.1996

Operations
From - To Activity Comments
1961 - 1961 Geophysics Company/Institution :NGU
1968 - 1968 Geophysics Company/Institution :Rana Gruber
1976 - 1976 Core drilling Company/Institution :Rana Gruber

Mineralization
Era: Proterozoic Period: Neoproterozoic
Genesis: Sedex Form: Layer
Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration: Skarn formation
Strike/Dip: 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 Amphibole Major mineral (>10%)
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Chlorite Subordinate mineral (1-10%)
Gangue mineral Calcite Subordinate mineral (1-10%)
Gangue mineral Biotite Subordinate mineral (1-10%)
Gangue mineral Dolomite Subordinate mineral (1-10%)
Gangue mineral Garnet Accessory mineral (<1%)
Gangue mineral Oligoclase Accessory mineral (<1%)
Gangue mineral Epidote Accessory mineral (<1%)
Ore mineral Magnetite Major mineral (>10%)
Ore mineral Apatite Subordinate mineral (1-10%)
Ore mineral Pyrite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Wall rock Granat-cum.skifer Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Amphibolite
Wall rock Karb.gl.skifer Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Foliation Strike/Dip :90 / 70 Syn-mineralisation ;...Effect :None
Host rock Primary layering Strike/Dip :270 / 20 Syn-mineralisation ;...Effect :None

Information(s) in free text format
Free text
De østligste 600m strøklengde ligger like nord for truckveien til Ørtfjell malmfelt, og like sør for Fjellbakken-Kvannevannet. Mineraliseringen er totalt 2,75km lang i strøkretningen øst-vest. De vestligste 750m er imidlertid bare 2 lag som er ca. 2-4m brede, mens de østlige 2km er 10-40m tykke. Mineraliseringen ble diamantboret med 9 hull i 5 profiler (1304m) i 1976. Boringene dekker de øslige 1,2 km strøklengde, og malmberegningen gir følgende utfall: Forholdet Malm Gråberg gråberg/malm i dagbrudd --------------------------------------------------------------------------- Ned til nivå 300 22 mill.t. 17 mill.t. Ca. 0,8 Ned til nivå 250 40 mill.t. 47 mill.t. Ca. 1,2 Interpolering mellom de 2 alternativene gir: Oppboret malm ca. 30 mill. t. med forhold gråberg/malm = 1. Magnetiske målinger indikerer at hovedmalmen synes å fortsette i ca. samme omfang 0,8 km videre vestover. Dette gir: Mulig malm ca. 15 mill. t. med forhold gråberg/malm = 1. Gehaltene er lave, i gjennomsnitt bare 13,3 % Fe-magn. Forholdet mellom relative tonnasjer og gehalter: Relativ Relativ Gjennomsnittsgehalter Fe-magn. vol. % Sp.v. vekt Fe-magn. P S Fe-silikat --------------------------------------------------------------------------------------- 0-5 2,3 3,00 2,2 3,2 0,34 0,38 9,3 5-10 24,6 3,05 23,7 7,3 0,45 0,65 8,5 10-15 27,9 3,15 27,9 13,0 0,52 0,34 6,6 15-20 35,9 3,20 36,5 16,5 0,61 0,20 5,7 >20 9,3 3,30 9,7 22,0 0,81 0,21 5,2 ------------------------------------------------------------------------------------- Total 100,0 3,15 100,0 13,3 0,55 0,36 6,7 I den østlige delen av den mineraliserte F2-isoklinalfold er fallet 30-50° mot foldens sentrum (NV). Dette gjør at utgående i dagen stort sett synes i opptil 50-70 m her. Området er middels til sterkt overdekket. Det som på kartet er tegnet som mineralisering er således delvis en tolkning av bakkemagnetiske profiler.

Bibliography:
From NGU's Reference Archive:
Søvegjarto, U.; Marker, M.; Gjelle, S. , 1989
Storforshei. Berggrunnskart; Storforshei; 20274; 1:50 000; trykt i farger;
;Norges geologiske undersøkelse;KART

Name of Locality: Lomlimyra (h. 375)
(Object Id: 3843 25,01,00)
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: 483382 m. North: 7366047 m.
Longitude: 14.6278380 Latitude: 66.4134710
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Name of Locality: Gammeldamlia(h. 380)
(Object Id: 3844 25,02,00)
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: 482932 m. North: 7366097 m.
Longitude: 14.6177540 Latitude: 66.4138940
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Name of Locality: Tretjønnmyra N.
(Object Id: 3845 25,03,00)
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: 482632 m. North: 7366097 m.
Longitude: 14.6110340 Latitude: 66.4138770
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Name of Locality: 450m V. f. Tretjønnmyra N.
(Object Id: 3846 25,04,00)
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: 482182 m. North: 7366147 m.
Longitude: 14.6009490 Latitude: 66.4143000
Show on map
Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:

The fact sheet was created on 08.05.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
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