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THE ORE DATABASE
Occurence 1833 - 032 Gløsen-Lerhåldalen
(Object Id: 2320)
(Last updated: 02.03.2005)
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: 486232 m. North: 7361747 m.
Longitude: 14.6921390 Latitude: 66.3750350
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Products
Element/product Crude ore grade or quality Reg. date
Fe-mag. ca. 12 % 29.03.1996
Fe-silicate ca. 7 % 29.03.1996
P ca. 0.5 % 29.03.1996
S ca. 0.3 % 29.03.1996

Operations
From - To Activity Comments
1943 - 1945 Pitting Company/Institution :Rana Gruber
1969 - 1970 Geology Company/Institution :Rana Gruber (Søvegjarto)
1970 - 1970 Geophysics Company/Institution :Rana Gruber/Terratest AB

Mineralization
Era: Proterozoic Period: Neoproterozoic
Genesis: Sedex Form: Layer
Main texture: Banded Min. distribution: Irregular (scattered)
Main grain size: Fine grained (< 1 mm) Main alteration:
Strike/Dip: 80 / 50 Direction: 80
Plunge: 0
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 Amphibole Major mineral (>10%)
Gangue mineral Chlorite Subordinate mineral (1-10%)
Gangue mineral Oligoclase 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
Host rock Amfibolitt Extrusive
Original rock :Basalt
Metamorphic facies :Amphibolite
Wall rock Dolomitt Sedimentary
Original rock :Dolomite
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 Primary layering Strike/Dip :80 / 0 Syn-mineralisation ;...Effect :None
Host rock Foliation Strike/Dip :80 / 50 Syn-mineralisation ;...Effect :None

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Gløsen-Lerhåldalen-feltet ligger noenlunde midt mellom malmene Nedre Grønfjell og Lasken i samme nivå. Her finnes 7 gamle skjerpesteder fra 1944/45: Hovedforekomsten: Vestenden til Lerhåldalen 5-10m dolomitt i nord 50m øst for Østre Gløsmyr 10m mt.-imp amfibolitt 650m vest for Svarttjønn 1-2m kvarts-magnetittmalm Skjerp 1: Lerhåldalen 25m mt.-imp. amfibolitt 320m VNV for Svarttjønn 10m dolomitt i sør Skjerp 2: Lerhåldalen 5m+30m mt.-imp. amf. 400m NØ f. Svarttjønn 30m dolomitt i sør Skjerp 3: Lerhåldalen 30m dolomitt i nord 375m ØNØ f. Svarttjønn 15m mt.-imp. amf. i sør Skjerp 4: 400m VSV for 75m uregelmessig magnetitt- Hattjønn impregnert amfibolitt. 5m dolomitt i sør Skjerp 5: 100m VSV for Hattjønn 75m mt.-imp. amfibolitt Skjerp 6: N-ende Smoppdalssletta 1-2m mt.-imp. amfibolitt 170-200m ØNØ Hattjønn I Lerhåldalenfeltet er magnetittimpregnert amfibolitt den dominerende mineralisering. Mens den rike kvarts-magnetitt-malmen er vanlig i Nedre Grønfjell- og Lasken-forekomstene, har man i Lerhåldalen kun 1-2 km kvarts-magnetittmalm i vest. Gjennomsnittlig er mineraliseringen fattig med ca. 19 % Fe-total. Total strøklengde er 2,1 km.

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

Thørnquist, C. , 1943
Rapport over jernmalmforekomsterne bestående av Lerhåldalsgangen, Gløsgangen, Mariemynthgangen og Klemethauggangen beliggende på Nedre Grønnfjell og Kvanndals eiendommer i Grønnfjelldalen i Nord-Rana.
;Norges geologiske undersøkelse;TEKNISK RAPPORT;Bergarkivet; No.BA 900;3 pages
Abstract:
Felles for disse forekomstene er at de består av fosforholdig magnetitt. Hver av dem blir så beskrevet for seg med anslått størrelse og jernprosent. Praktiske vurderinger ved eventuell drift blir gjort tilslutt i rapporten.

Name of Locality: Lerhåldalen I
(Object Id: 3878 32,01,00)
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: 486532 m. North: 7361797 m.
Longitude: 14.6988420 Latitude: 66.3754960
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


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Skjerp 1: Lerhåldalen 25m mt.-imp. amfibolitt 320m VNV for Svarttjønn 10m dolomitt i sør

Name of Locality: Lerhåldalen II
(Object Id: 3879 32,02,00)
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: 487282 m. North: 7362047 m.
Longitude: 14.7155880 Latitude: 66.3777700
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


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Skjerp 2: Lerhåldalen 5m+30m mt.-imp. amf. 400m NØ f. Svarttjønn 30m dolomitt i sør

Name of Locality: Lerhåldalen III
(Object Id: 3880 32,03,00)
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: 487282 m. North: 7361947 m.
Longitude: 14.7155980 Latitude: 66.3768730
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


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Skjerp 3: Lerhåldalen 30m dolomitt i nord 375m ØNØ f. Svarttjønn 15m mt.-imp. amf. i sør

Name of Locality: Hattjønn I
(Object Id: 3881 32,04,00)
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: 487432 m. North: 7362047 m.
Longitude: 14.7189430 Latitude: 66.3777760
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


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Skjerp 4: 400m VSV for 75m uregelmessig magnetitt- Hattjønn impregnert amfibolitt. 5m dolomitt i sør

Name of Locality: Hattjønn II
(Object Id: 3882 32,05,00)
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: 487732 m. North: 7362097 m.
Longitude: 14.7256480 Latitude: 66.3782370
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Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


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Skjerp 5: 100m VSV for Hattjønn 75m mt.-imp. amfibolitt

Name of Locality: Smoppdalssletta
(Object Id: 3883 32,06,00)
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: 488132 m. North: 7362147 m.
Longitude: 14.7345880 Latitude: 66.3787010
Show on map
Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe P
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


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Skjerp 6: N-ende Smoppdalssletta 1-2m mt.-imp. amfibolitt 170-200m ØNØ Hattjønn

The fact sheet was created on 03.05.2024
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