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	THE ORE DATABASE
	Occurence 1853 - 009 Nedre Kleven
	(Object Id: 2413) (Last updated: 20.03.2024)

Products

	Element/product	Crude ore grade or quality	Reg. date
	Fe-total	26 %	28.09.1992

Operations

	From - To	Activity	Comments
	1931 - 1931	Core drilling
	1931 - 1935	Regular production	Company/Institution :Arbeiderselskapet med statsstøtte
	1936 - 1939	Regular production	Company/Institution :A/S Sydvaranger
	2012 - 2014	Geology	Company/Institution :NGU

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:	225 / 40	Direction:	260
			Plunge:	30

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Neoproterozoic

	Province:	Caledonides
	Geotec.unit:	Seve-Køli Nappe Complex
	Tectonic complex:	Øvre allokton
	Igneous complex:

Group:

Bogengruppen

Formation:

Håfjell jernmalmformasjon

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Amphibole	Major mineral (>10%)
	Ore mineral	Magnetite	Major mineral (>10%)
	Ore mineral	Pyrite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Unknown	Glimmerskifer	Sedimentary Original rock :Greywacke
			Metamorphic facies :Amphibolite
	Unknown	Amfibolitt	Extrusive Original rock :Basalt
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Unknown	Primary layering	Strike/Dip :225 / 40	Syn-mineralisation ;...Effect :None

Information(s) in free text format

Free text

The Bogen Fe ore field consists of a number of workings over a strike length of c. 6 km. About 1.6 mill.t of magnetite ore was produced from three open pits with associated underground workings (Øvre and Nedre Kleven, Bergvik) between 1906 and 1939 (several periods). The ore occurs in several layers and lenses of semimassive ore, varying in thickness from less than 2 meters and up to c. 10 meters, typically separated by amphibolitic layers often with magnetite impregnation. The total thickness of the mineralized zone varies from c. 10 meters to 100-200 meters. The zone is strongly deformed and is folded into a number of recumbent tight to isoclinals fold structures, which have disrupted the ore layers and increased considerably the thickness in the fold closures. The mineralized zone is situated between calcareous mica schist (structurally below) and calcite marble (structurally above). The ore is generally banded/laminated on mm to cm scale, with alternating quartz, amphibole +/- biotite and magnetite layers. At places the ore contains thin manganese-rich or/and hematite-rich layers, typically in the structurally upper and lower parts, respectively.

Bibliography:

References not to be found in NGU's Reference Archive.:

Søvegjarto, U. 1978: Bogen jernmalmfelt. Sluttrapport geologi. Int. rapp. Rana Gruber A/S. 10 sider, 51 bilag.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	NKleven-1	Bedrock	Sampler: Bjerkgård/Raaness/...Stored: Løkken Comment: Biotittrik, pyrittholdig båndet magnetittmalm No. of registrated oxide analyses = 1
	NKleven-2	Bedrock	Sampler: Bjerkgård/Raaness/...Stored: Løkken Comment: cm-båndet kvarts-magnetitt malm No. of registrated oxide analyses = 1
	NKleven-3	Bedrock	Sampler: Bjerkgård/Raaness/...Stored: Løkken Comment: Pyrittbåndet magnetittmalm No. of registrated oxide analyses = 1
	NKleven-4	Bedrock	Sampler: Bjerkgård/Raaness/...Stored: Løkken Comment: mm-båndet kvarts-magnetittmalm, grovkornet magnetitt No. of registrated oxide analyses = 1
	NO0271.01	Bedrock	Sampler: Sørdal, T./...Stored: Løkken Comment: Magnetittmalm, div. No. of registrated element analyses = 1
	NO0271.02	Bedrock	Sampler: Sørdal, T./...Stored: Løkken Comment: Magnetittmalm, massiv. No. of registrated element analyses = 1
	NO0271.03	Bedrock	Sampler: Sørdal, T./...Stored: Løkken Comment: Båndet magnetittmalm. No. of registrated element analyses = 1
	NO0271.04	Bedrock	Sampler: Sørdal, T./...Stored: Løkken Comment: Rusten magnetittmalm, med tynne sulfidbånd. No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

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Analyse Results

from

Deposit Area 1853 - 009 Nedre Kleven

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#
NO0271.01	Bedrock	5	31	2	18	9	.1	6.0
NO0271.02	Bedrock	2	41	2	21	10	.1	2.0
NO0271.03	Bedrock	3	33	2	17	8	.1	1.0
NO0271.04	Bedrock	116	40	2	24	11	.2	4.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
NO0271.01	3.0	3.0	2	.2	4	1.00	3	2	.02
NO0271.02	3.0	3.0	2	.2	63	1.00	2	2	.01
NO0271.03	3.0	3.0	2	.2	10	1.00	2	5	.02
NO0271.04	3.0	3.0	2	.2	35	1.00	2	2	4.58

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Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
NO0271.01	43	24	194	26.36	2.00	5.00	1	77.0	14.00
NO0271.02	38	20	693	22.25	4.00	5.00	1	57.0	16.00
NO0271.03	40	25	167	24.26	3.00	5.00	1	72.0	13.00
NO0271.04	38	20	190	23.46	2.00	5.00	1	35.0	10.00

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Sample No.	B*
NO0271.01	2
NO0271.02	2
NO0271.03	2
NO0271.04	2

Oxide analyses

( All values are in % )

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
NKleven-1	Bedrock	58.18	10.25	0.73	16.04	0.15	4.20	4.49
NKleven-2	Bedrock	45.98	5.58	0.37	30.98	0.28	3.75	8.38
NKleven-3	Bedrock	40.00	7.61	0.38	35.65	1.02	2.41	4.36
NKleven-4	Bedrock	35.31	1.82	0.15	57.82	0.50	1.63	3.28

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Sample No.	Na2O	K2O	P2O5	Loss	Sum
NKleven-1	0.90	2.66	0.27	1.27	99.00
NKleven-2	0.62	0.86	0.42	2.50	100.00
NKleven-3	0.19	0.97	0.38	6.04	99.00
NKleven-4	0.18	0.13	0.55	-1.14	100.00

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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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