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

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 25.04.2024

Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no

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