Norsk versjon
THE ORE DATABASE
Occurence 1826 - 031 Unkerelva
(Object Id: 2895)
(Last updated: 26.04.2020)

Location
County: Nordland Municipality: Aarborte (1826)
Map 1:50000: Hattfjelldal (1926-2) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 454974 m. North: 7266837 m.
Longitude: 14.0261550 Latitude: 65.5207110
Show on map

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: Exploration Reserves:
Operating method: Historical production:


Mineralization
Era: Paleozoic Period:
Genesis: Sedimentary deposit Form: Layer
Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration: Chloritisation
Strike/Dip: 190 / 30 Direction: 265
Plunge: 20
Stratigraphic classification of host rock
Era: Paleozoic Period:
Province: Caledonides
Geotec.unit: Seve-Køli Nappe Complex
Tectonic complex: Øvre allokton
Igneous complex:
Group: Liminggruppen Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Chlorite Subordinate mineral (1-10%)
Gangue mineral Muscovite Subordinate mineral (1-10%)
Gangue mineral Carbonate Subordinate mineral (1-10%)
Ore mineral Magnetite Major mineral (>10%)
Ore mineral Hematite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Host rock Magnetitt-kvartsitt Sedimentary
Original rock :Sandstone
Metamorphic facies :Greenschist
Wall rock kalkfyllitt Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Greenschist

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :215 / 25 Post-mineralisation ;...Effect :None
Wall rock Fold axis Strike/Dip :265 / 20 Post-mineralisation ;...Effect :None

Information(s) in free text format
Free text
Several layers of iron formations are exposed in a more than 250 m wide W-E orientated section along the southern riverbank of Unkerelva. The iron formation occurs interlayered with a rock interpreted as diamictite. The diamictite consists of calcareous mica schist with scattered, sub-rounded to rounded and elongated clasts of dolostone (1-5 cm) and calcite marble (1-20 cm). The iron formation is banded in centimetres to decimetres-scale in up to 10 m thick/wide zones and consists of semi-massive to disseminated bands and lenses of magnetite. The true thickness of the units is hard to decide due to intense folding and non-continuous outcrops. The main locality is marked close to a sharp river bend in Unkerelva. The iron formation overlies diamictite with few dolostone clasts and consists of a 4-5 m thick layer of green, calcareous chlorite-mica with several, few cm-thick bands of semi-massive magnetite.

Bibliography:
From NGU's Reference Archive:
Dallmann, W.K. , 1994
Hattfjelldal. Berggrunnskart; Hattfjelldal; 19262; 1:50 000; trykt i farger; NGU Rapport 93.044
;Norges geologiske undersøkelse;KART

Dallmann, W.K.; Stølen, L.K. , 1994
Hattfjelldal - berggrunnsgeologisk kart 1926 II - M 1:50 000. Beskrivelse
;Norges geologiske undersøkelse;FAGRAPPORT; KARTBESKRIVELSE; BIBLIOGRAFI; EKSKURSJONSGUIDE;NGU-rapport; No.93.044;47 pages
Abstract:
Kartblad Hattfjelldal 1:50 000 ligger innenfor den kaledonske fjellkjede. Berggrunnen omfatter flere skyvedekker, med undre Køli i øst og Helgelands- dekkekomplekset i vest. Kølidekkene består for det meste av lav grads metamorfe, ordoviciske til siluriske bergarter. Det er hovedsakelig fyllitter og karbonatbergarter, underordnet konglomerater, kvartsitter og grønnskifre. Karbonatbergartene forekommer særlig innenfor Hattfjelldalsdekket hvor de ut- gjør Røssvassgruppen (tidligere kjent under navnet Hattfjelldalskalken). De er antatt å være kildebergartene til en tykk konglomeratsekvens ved basis av den overliggende Limingengruppen. Det linseformede Krutfjelldekket har en spesiell stilling innenfor Kølidekkene. Det består av høy grads metamorfe gneiser og amfibolitter som omgir en tidlig- til mellomordovicisk gabbrointrusion. Helgelandsdekkekomplekset er delt inn i 3 enheter: Et undre intrusivkompleks, Skinnfjellenheten, med hovedsakelig kvartsdioritt og metagabbro; et båndet gneiskompleks, Geittindenheten, og et marmor/glimmergneiskompleks, Appfjell- enheten. Grensene mellom disse enhetene er tektoniske, men det er mulig at de to sistnevnte enhetene utgjør et opprinnelig "basement-cover" forhold. Høy grads omdanningen skjedde i tidlig kaledonsk eller prekambrisk tid. Noen av metasedimentene innenfor lav grads dekkene ser ut til å være yngre enn denne omdanningen. Hele lagrekken ble utsatt for skyve- og foldetektonikk under lav grads betingelser i den skandiske orogene fase i mellomsilurisk til devonisk tid. Prospektering etter metaller (bly, zink, kobber og gull) og andre nyttbare bergarter og mineraler har vært utført i området, men ingen drivverdige forekomster er funnet til nå.

Dallmann, Winfried K. , 1987
Sedimentary environment and synsedimentary tectonics in the Hattfjelldal Nappe, North-Central Norway.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.410;25-54 pages
Abstract:
The Hattfjelldal Nappe, part of the "eugeoclinical" Seve-Köli Nappe Complex of the Scandinavian Caledonides, occurs beneath the basal thrust zone of the Helgeland Nappe Complex. Detailed fieldwork in these strongly deformed rocks has allowed recognition of a stratigraphic succession which partly can be correlated with successions adjacent nappes and other areas in the Central and North Scandinavian Caledonides. Two main groups can be recognized. The Røssvatnet Group is assumed to represent an Early Silurian carbonate tidal-flat and adjcent basinal environment, possibly situated upon a former accreted island arc/continental margin complex. Scandian tectonism is considered to have commenced subsequently, with the westward tilting of the depositional area which gave rise to a sedimentary unconfirmity (base of Limingen Group) and the development of psephitic massgravity sediments. The Limingen Group is considered to represent a transition from flysch to molasse facies, where sediments were derived from the advancing nappe front of the Helgeland Nappe Complex to the west. Sedimentation then ceased as the basin was overthrust in the Mid Silurian and truncated by the nappes, which gave rise to a post-sedimentary polyphase deformation sequence.

Fieldsamples
Sample No. Sample type Miscellanrous
JS_H19 Bedrock
Sampler: Jan Sverre Sandstad/...Stored: Løkken
Comment: Massive magnetite bands in fine grained, green quartz-calcite bearing matrix
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
NO0792.01 Bedrock
Sampler: Wilberg, R./...Stored: Løkken
Comment: Magnetitt-kvartsitt.
No. of registrated element analyses = 1
NO0792.02 Bedrock
Sampler: Wilberg, R./...Stored: Løkken
Comment: Magnetitt-kvartsitt.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Prøvepunkt 1
(Object Id: 4163 31,00,01)

Location
County: Nordland Municipality: Aarborte (1826)
Map 1:50000: Hattfjelldal (1926-2) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 454855 m. North: 7266830 m.
Longitude: 14.0235840 Latitude: 65.5206310
Show on map

Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe


Information(s) in free text format
Free text
A 1-2 m thick layer of iron formation occurs within diamictite. It is not so well exposed.

Fieldsamples
Sample No. Sample type Miscellanrous
JS_H18 Bedrock
Sampler: Jan Sverre Sandstad/...Stored: Løkken
Comment: Magnetite-quartz-carbonate banded mineralisation, fine grained
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
NO0792.03 Bedrock
Sampler: Wilberg, R./...Stored: Løkken
Comment: Magnetitt-kvartsitt.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Sample point: Prøvepunkt 2
(Object Id: 36472 31,00,02)

Location
County: Nordland Municipality: Aarborte (1826)
Map 1:50000: Hattfjelldal (1926-2) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 454794 m. North: 7266844 m.
Longitude: 14.0222600 Latitude: 65.5207570
Show on map

Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe


Information(s) in free text format
Free text
Minor outcrop with fine grained, massive to semi-massive magnetite bands in calcareous schist.

Fieldsamples
Sample No. Sample type Miscellanrous
JS_H17 Bedrock
Sampler: Jan Sverre Sandstad/...Stored: Løkken
Comment: Semi-massive magnetite mineralisation in quartz-calcite matrix, fine grained
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 3
(Object Id: 36473 31,00,03)

Location
County: Nordland Municipality: Aarborte (1826)
Map 1:50000: Hattfjelldal (1926-2) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 454720 m. North: 7266839 m.
Longitude: 14.0206620 Latitude: 65.5206930
Show on map

Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe


Information(s) in free text format
Free text
Magnetite-bearing diamictite, with clasts of dolostone and calcite marble is at least 10 m thick is exposed at the southern riverbank. Magnetite occurs as massive bands in mm- to cm-scale that comprise up to 0.5 m thick layers.

Fieldsamples
Sample No. Sample type Miscellanrous
JS_H16 Bedrock
Sampler: Jan Sverre Sandstad/...Stored: Løkken
Comment: Semi-massive magnetite-bands in calcite-bearing diamictite
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: Gaulfjellet
(Object Id: 36474 31,01,00)

Location
County: Nordland Municipality: Aarborte (1826)
Map 1:50000: Hattfjelldal (1926-2) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 455056 m. North: 7267724 m.
Longitude: 14.0276370 Latitude: 65.5286840
Show on map

Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Mineralogy
Relationship Mineral Amount
Gangue mineral Carbonate Major mineral (>10%)
Gangue mineral Chlorite Major mineral (>10%)
Gangue mineral Quartz Major mineral (>10%)
Ore mineral Magnetite Major mineral (>10%)

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :135 / 50 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format
Free text
A ca. 50 m thick section of iron formation and diamictite are well exposed in road-cuts west of Gaulfjellet, approximately 1 km north of the Unkerelva profile. Diamictite overlies tectonostratigraphically variegated and greyish white calcite marble in the north. The diamictite is 30-40 m thick with gradual transition to a 3-4 m thick magnetite-bearing diamictite with few, rounded to sub-rounded clasts of dolostone. On top, in the southern part of the road-cut is situated a 5-6 m thick magnetite-enriched diamictite with more flattened dolostone clasts. Magnetite occurs both in semi-massive bands comprising iron formations (Sample JS_H51), and as dissemination in thin lenses/bands.

Bibliography:
From NGU's Reference Archive:
Dallmann, W.K. , 1994
Hattfjelldal. Berggrunnskart; Hattfjelldal; 19262; 1:50 000; trykt i farger; NGU Rapport 93.044
;Norges geologiske undersøkelse;KART

Dallmann, W.K.; Stølen, L.K. , 1994
Hattfjelldal - berggrunnsgeologisk kart 1926 II - M 1:50 000. Beskrivelse
;Norges geologiske undersøkelse;FAGRAPPORT; KARTBESKRIVELSE; BIBLIOGRAFI; EKSKURSJONSGUIDE;NGU-rapport; No.93.044;47 pages
Abstract:
Kartblad Hattfjelldal 1:50 000 ligger innenfor den kaledonske fjellkjede. Berggrunnen omfatter flere skyvedekker, med undre Køli i øst og Helgelands- dekkekomplekset i vest. Kølidekkene består for det meste av lav grads metamorfe, ordoviciske til siluriske bergarter. Det er hovedsakelig fyllitter og karbonatbergarter, underordnet konglomerater, kvartsitter og grønnskifre. Karbonatbergartene forekommer særlig innenfor Hattfjelldalsdekket hvor de ut- gjør Røssvassgruppen (tidligere kjent under navnet Hattfjelldalskalken). De er antatt å være kildebergartene til en tykk konglomeratsekvens ved basis av den overliggende Limingengruppen. Det linseformede Krutfjelldekket har en spesiell stilling innenfor Kølidekkene. Det består av høy grads metamorfe gneiser og amfibolitter som omgir en tidlig- til mellomordovicisk gabbrointrusion. Helgelandsdekkekomplekset er delt inn i 3 enheter: Et undre intrusivkompleks, Skinnfjellenheten, med hovedsakelig kvartsdioritt og metagabbro; et båndet gneiskompleks, Geittindenheten, og et marmor/glimmergneiskompleks, Appfjell- enheten. Grensene mellom disse enhetene er tektoniske, men det er mulig at de to sistnevnte enhetene utgjør et opprinnelig "basement-cover" forhold. Høy grads omdanningen skjedde i tidlig kaledonsk eller prekambrisk tid. Noen av metasedimentene innenfor lav grads dekkene ser ut til å være yngre enn denne omdanningen. Hele lagrekken ble utsatt for skyve- og foldetektonikk under lav grads betingelser i den skandiske orogene fase i mellomsilurisk til devonisk tid. Prospektering etter metaller (bly, zink, kobber og gull) og andre nyttbare bergarter og mineraler har vært utført i området, men ingen drivverdige forekomster er funnet til nå.

Fieldsamples
Sample No. Sample type Miscellanrous
JS_H49 Bedrock
Sampler: Jan Sverre Sandstad/...Stored: Løkken
Comment: Diamictite with magnetite-laminae and few disseminated pyrite
No. of registrated element analyses = 1
No. of registrated oxide analyses = 1
JS_H51 Bedrock
Sampler: Jan Sverre Sandstad/...Stored: Løkken
Comment: Banded magnetite-carbonate-quartz-chlorite mineralisation
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: Østerdalen
(Object Id: 37350 31,02,00)

Location
County: Nordland Municipality: Aarborte (1826)
Map 1:50000: Hattfjelldal (1926-2) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 455325 m. North: 7271730 m.
Longitude: 14.0321180 Latitude: 65.5646620
Show on map

Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
JS_H46 Bedrock
Sampler: Jan Sverre Sandstad
Comment: Finely banded magnetite 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 Locality: Hattfjelldal
(Object Id: 37351 31,03,00)

Location
County: Nordland Municipality: Aarborte (1826)
Map 1:50000: Hattfjelldal (1926-2) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 454488 m. North: 7272813 m.
Longitude: 14.0136410 Latitude: 65.5742610
Show on map

Resource
Resource Type: Ferrous metals(Fe, Mn, Ti) Resource Subtype: Iron
Element(s): Fe
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
JS_H45 Bedrock
Sampler: Jan Sverre Sandstad
Comment: Finely banded magnetite 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.:


Analyse Results
from
Deposit Area 1826 - 031 Unkerelva

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#
JS_H16 Bedrock 16 32 5 7 16 1.6
JS_H17 Bedrock 9 40 7 7 22 3.8
JS_H18 Bedrock 8 40 4 7 13 .9
JS_H19 Bedrock 3 49 6 12 20 -.5
JS_H45 Bedrock 8
JS_H46 Bedrock 10
JS_H49 Bedrock 9
JS_H51 Bedrock 6
NO0792.01 Bedrock 35 52 6 28 24 .1 2.0
NO0792.02 Bedrock 11 69 2 37 43 .1 3.0
NO0792.03 Bedrock 15 39 6 24 22 .1 5.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* Ga*
JS_H16 -1 89 -0.10 7.30
JS_H17 1 83 0.20 6.70
JS_H18 1 142 -0.10 8.10
JS_H19 1 17 0.60 7.50
JS_H45 22 5.40
JS_H46 20 4.40
JS_H49 165 6.30
JS_H51 2 4.90
NO0792.01 3.0 3.0 2 1.0 27 1.00 2 5
NO0792.02 3.0 3.0 2 .2 49 1.00 2 8
NO0792.03 8.0 3.0 2 .6 16 1.00 2 6
------------------
Sample No. S% V* Cr* Mn* Fe% Th* U* W* Rb*
JS_H16 80 27 2.90 0.40 -1 16.5
JS_H17 78 14 3.00 0.50 -1 14.6
JS_H18 86 14 3.00 0.50 1 33.1
JS_H19 145 27 3.30 0.90 1 1.2
JS_H45 88 2.60 0.50 1 8.1
JS_H46 80 2.90 0.40 -1 0.7
JS_H49 75 3.90 0.90 27 18.7
JS_H51 100 2.60 0.40 -1 -0.1
NO0792.01 .04 58 31 996 21.02 4.00 5.00 1
NO0792.02 .03 96 33 429 31.86 6.00 5.00 3
NO0792.03 .03 35 18 2795 20.82 3.00 5.00 1
------------------
Sample No. Sr* Y* Zr* Nb* Ta* Cs* La* Ce* Pr*
JS_H16 144.0 17.1 71 6.40 0.40 0.60 13.90 28.30 3.33
JS_H17 157.5 17.0 69 5.20 0.30 0.50 16.10 32.60 4.00
JS_H18 90.5 19.9 88 5.40 0.30 1.10 18.60 38.50 4.44
JS_H19 188.5 17.3 86 8.70 0.50 -0.10 18.90 39.00 4.53
JS_H45 83.7 16.5 68 6.20 0.30 1.10 14.00 30.40 3.83
JS_H46 141.0 13.9 68 5.50 0.30 -0.10 12.10 25.80 3.27
JS_H49 350.2 19.1 98 5.30 0.40 0.60 18.10 35.40 4.44
JS_H51 130.1 15.1 72 10.00 0.30 -0.10 12.00 25.00 3.21
NO0792.01 186.0 16.00
NO0792.02 66.0 19.00
NO0792.03 135.0 12.00
------------------
Sample No. Nd* Sm* Eu* Gd* Tb* Dy* Ho* Er* Tm*
JS_H16 13.00 2.92 0.66 2.81 0.51 2.74 0.59 1.82 0.29
JS_H17 16.20 3.15 0.76 3.09 0.51 2.85 0.57 1.67 0.27
JS_H18 16.90 3.33 0.82 3.53 0.56 3.27 0.73 2.17 0.32
JS_H19 18.00 3.60 0.91 3.46 0.57 3.18 0.65 1.86 0.27
JS_H45 16.20 3.22 0.71 3.22 0.47 2.80 0.59 1.77 0.25
JS_H46 13.00 2.51 0.64 2.49 0.39 2.49 0.49 1.46 0.21
JS_H49 17.90 3.27 0.78 3.43 0.53 3.16 0.71 1.95 0.28
JS_H51 12.90 2.57 0.52 2.68 0.43 2.53 0.57 1.60 0.22
NO0792.01
NO0792.02
NO0792.03
------------------
Sample No. Yb* Lu* B* Be* Hf*
JS_H16 1.89 0.28 1.80
JS_H17 1.69 0.25 1.70
JS_H18 2.08 0.34 2.10
JS_H19 1.79 0.28 2.20
JS_H45 1.63 0.28 -1 1.50
JS_H46 1.30 0.22 -1 1.50
JS_H49 1.85 0.28 -1 2.40
JS_H51 1.53 0.23 -1 1.70
NO0792.01 2
NO0792.02 15
NO0792.03 5

Oxide analyses

( All values are in % )
Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO
JS_H16 Bedrock 35.94 3.62 0.34 43.68 0.32 2.72 5.59
JS_H17 Bedrock 34.35 4.01 0.35 42.52 0.50 2.74 5.82
JS_H18 Bedrock 40.95 4.23 0.32 44.00 0.14 2.01 3.53
JS_H19 Bedrock 41.19 3.86 0.36 30.94 0.17 4.55 8.62
JS_H45 Bedrock 37.30 3.14 0.27 48.10 0.22 1.60 3.31
JS_H46 Bedrock 32.20 4.53 0.34 43.40 0.54 3.00 5.93
JS_H49 Bedrock 35.90 5.17 0.44 13.80 0.13 6.39 16.40
JS_H51 Bedrock 35.70 3.13 0.31 43.50 0.32 3.56 6.15
------------------
Sample No. Na2O K2O P2O5 Loss Sum
JS_H16 0.58 0.43 0.49 5.96 100.00
JS_H17 1.22 0.37 0.62 6.77 99.00
JS_H18 0.11 0.84 0.43 2.90 99.00
JS_H19 -0.01 0.03 0.58 9.53 100.00
JS_H45 1.24 0.11 0.36 2.86 99.00
JS_H46 2.31 0.03 0.44 6.68 99.00
JS_H49 0.37 0.53 0.33 19.66 99.00
JS_H51 -0.01 -0.01 0.50 6.00 99.00


The fact sheet was created on 24.10.2021

Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
Copyright © 2021 Geological Survey of Norway