Norsk versjon
	THE ORE DATABASE
	Deposit Area 1833 - 040
	(Last updated 15.mar.2024)

Importance

Public:

National Importance (reg. 09.02.2017)

Economical:

Very significant , (Confirmed 08.mai.2001 by Jan Sverre Sandstad)

Products

	Element/product	Crude ore grade or quality
	FE	34 %

Operations

	From - To	Activity	Comments
	1952 - 1981	Geology	Company/Institution :Rana Gruber
	1952 - 1986	Core drilling	Company/Institution :Rana Gruber
	1975 - 1992	Regular production	Company/Institution :Rana Gruber

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:		Method:
	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:	240 / 90	Direction:	245
			Plunge:	60

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Neoproterozoic

	Province:	Caledonides
	Geotec.unit:	Rødingsfjell Nappe Complex
	Tectonic complex:	Midtre allokton
	Igneous complex:

Group:

Ørtfjell

Formation:

Dunderland

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Albite
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Biotite	Subordinate mineral (1-10%)
	Gangue mineral	Apatite	Subordinate mineral (1-10%)
	Gangue mineral	Muscovite	Subordinate mineral (1-10%)
	Gangue mineral	Amphibole	Subordinate mineral (1-10%)
	Gangue mineral	Calcite	Subordinate mineral (1-10%)
	Gangue mineral	Potassic feldspar	Subordinate mineral (1-10%)
	Gangue mineral	Dolomite	Subordinate mineral (1-10%)
	Gangue mineral	Epidote	Subordinate mineral (1-10%)
	Gangue mineral	Chlorite	Subordinate mineral (1-10%)
	Gangue mineral	Garnet	Accessory mineral (<1%)
	Ore mineral	Hematite	Major mineral (>10%)
	Ore mineral	Magnetite	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Unknown	Carbonate mica schist	Sedimentary Original rock :Argillaceous sediment
			Metamorphic facies :Amphibolite
	Unknown	Mica schist	Sedimentary Original rock :Greywacke
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Unknown	Fold axis	Strike/Dip :240 / 60	Syn-mineralisation ;...Effect :None
	Unknown	Foliation
	Unknown	Primary layering

Information(s) in free text format

Free text

The Dunderlandsdalen iron district comprises a number of smaller and larger hematite-magnetite ore deposits, of which the Ørtfjell deposit is currently in production. Other mines which now are closed are: Finnkåteng (produced 10.7 Mt with 37.4 % Fe), Vesteråli (14.6 Mt with 35.3 % Fe, 22 Mt reserves), Ørtvann (17.6 Mt with 33 % Fe, 26 Mt reserves). In addition is Ørtfjell Øst an important deposit, which has not been exploited (33 Mt reserves with 33.6 % Fe). Altogether c. 100 Mt of iron ore, grading 33-37 % Fe, has been produced during the last 100 years. The immediate host rocks of the mineralisation are mica schists of various types, but the schists themselves occur in a sequence dominated by dolomitic and calcitic marble units several hundred metres thick. Two main ore horizons, from a few metres to 30 m thick, are found: 1) an upper magnetite-hematite ore, containing 0.15–0.3 % P, and 2) a lower apatite-bearing magnetite ore containing 0.8–1 % P. Each unit contains several ore bodies, the most important ones belonging to the upper unit. These include the Ørtfjell deposit, by far the largest in the district, which includes the Kvannevann mine, currently producing roughly 2.1 Mt/a. The total tonnage of the ore body is 417 Mt with 34 % Fe. The mt:hm ratio averages 2:1 at Ørtfjell, but ranges down to 1:10 in other deposits within the upper unit. Where hematite is dominant the gangue minerals are quartz, calcite, epidote and biotite, and where magnetite is dominant the gangue minerals are quartz, calcite, biotite, hornblende and grunerite. Bands of pyrrhotite up to 1 m thick are found at the margins of the ores and minor amounts of pyrite are common. The upper unit is also enriched in manganese, commonly containing 5–10 % MnO.

Bibliography:

From NGU's Reference Archive:

Sakshaug, G.F. , 1962

	Magnetisk Undersøkelse 1. Ørtvann - Ørtfjell 2. Ømmervannfeltet 3. Gløsen Øst.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.324;20 pages

Sindre, Atle , 1980

	Tyngdemålinger ved Ørtfjell

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1764;6 pages

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

Søvegjarto, U. 1986: Ørtfjell jernmalmfelt. Ny geologisk 1:1000 dagkartlegging 1973-81. Int. rapp. Rana Gruber AS.

Søvegjarto, U. 1988: Manuskript angående jernmalmer i Norge (7 kapitler). Kapitlet om "Rana Iron Ore Province". NGU og Rana Gruber.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	NO0597.01	Bedrock	Sampler :Søvegjarto, U./...Stored :Løkken Comment :Fe-malm. No. of registrated element analyses = 1
	NO0597.02	Bedrock	Sampler :Søvegjarto, U./...Stored :Løkken Comment :Fe-malm. No. of registrated element analyses = 1
	OF-1	Block	Sampler :J.S. Sandstad Comment :Hematite-quartz-epidote banded ore No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	OF-2	Block	Sampler :J.S. Sandstad Comment :Hematite-carbonate banded 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 Sample point : Prøvepunkt

(Object Id : 1833,040,00,01)

---

Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.6731730

Latitude:

66.4185390

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

485410 m.

Y-coord:

7366600 m.

Commodity

	Main Type:	Ferrous metals(Fe, Mn, Ti)	Sub Type:	Iron
			Element(s):	Fe

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	Rana-1	Bedrock	Sampler :Bjerkgård/Raaness/...Stored :Løkken Comment :Pyrittbåndet magnetittmalm No. of registrated oxide analyses = 1

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

Name of Sample point : Prøvepunkt

(Object Id : 1833,040,00,02)

---

Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.6741550

Latitude:

66.4205330

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

485454 m.

Y-coord:

7366823 m.

Commodity

	Main Type:	Ferrous metals(Fe, Mn, Ti)	Sub Type:	Iron
			Element(s):	Fe

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	Rana-2	Bedrock	Sampler :Bjerkgård/Raaness/...Stored :Løkken Comment :Kvarts-kalkbåndet hematitt No. of registrated oxide analyses = 1

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

Name of Locality : Nordmalmen

(Object Id : 1833,040,01,00)

---

Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.6803070

Latitude:

66.4212360

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

485730 m.

Y-coord:

7366899 m.

Commodity

	Main Type:	Ferrous metals(Fe, Mn, Ti)	Sub Type:	Iron
			Element(s):	Fe

Production

	Activity:	Mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Active	Volume of dump:

Name of Locality : Midtmalmen

(Object Id : 1833,040,02,00)

---

Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.6959570

Latitude:

66.4211110

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

486428 m.

Y-coord:

7366882 m.

Commodity

	Main Type:	Ferrous metals(Fe, Mn, Ti)	Sub Type:	Iron
			Element(s):	Fe

Production

	Activity:	Mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Active	Volume of dump:

Name of Locality : Eriksmalmen

(Object Id : 1833,040,03,00)

---

Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.6960380

Latitude:

66.4227210

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

486432 m.

Y-coord:

7367062 m.

Commodity

	Main Type:	Ferrous metals(Fe, Mn, Ti)	Sub Type:	Iron
			Element(s):	Fe

Production

	Activity:	Mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Active	Volume of dump:

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	E-1	Dump	Sampler :Terje Bjerkgård Comment :Båndet hematittmalm No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	E-2	Dump	Sampler :Terje Bjerkgård Comment :Båndet hematittmalm, fosforholdig No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	E-3	Dump	Sampler :Terje Bjerkgård Comment :Båndet hematitt-Mn-karbonat malm 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 : Kvannevannsmalmen

(Object Id : 1833,040,04,00)

---

Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.7312270

Latitude:

66.4256110

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

488004 m.

Y-coord:

7367376 m.

Commodity

	Main Type:	Ferrous metals(Fe, Mn, Ti)	Sub Type:	Iron
			Element(s):	Fe

Production

	Activity:	Mining	Reserves:
	Prod. method:	Underground mining	Production:
	Prod. status:	Active	Volume of dump:

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	KV-1	Dump	Sampler :Terje Bjerkgård Comment :Foldet hematittmalm No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	KV-2	Dump	Sampler :Terje Bjerkgård Comment :Kvartsbåndet hematittmalm No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	KV-3	Dump	Sampler :Terje Bjerkgård Comment :Manganbåndet hematittmalm 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 : Hyttmalmen

(Object Id : 1833,040,05,00)

---

Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.7138910

Latitude:

66.4230960

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

487230 m.

Y-coord:

7367100 m.

Commodity

	Main Type:	Ferrous metals(Fe, Mn, Ti)	Sub Type:	Iron
			Element(s):	Fe

Production

	Activity:	Mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Active	Volume of dump:

---

Analyse Results

from

Deposit Area 1833 - 040 Ørtfjell

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#
E-1	Dump	6	17	1	8	10	-.1	1.7
E-2	Dump	5	7	2	8	4	-.1	1.9
E-3	Dump	40	24	1	244	32	-.1	.7
KV-1	Dump	31	17	2	8	7	-.1	2.2
KV-2	Dump	78	32	1	9	8	-.1	4.1
KV-3	Dump	11	77	4	271	432	-.1	-.5
NO0597.01	Bedrock	37	92	54	-1	48	-.3	4.0
NO0597.02	Bedrock	18	73	20	-1	16	-.3	-2.0
OF-1	Block	7	7	2	3	6		1.8
OF-2	Block	8	10	2	4	4		2.3

------------------

Sample No.	Pt#	Pd#	Rh#	As*	Cd*	Ba*	Mo*	Sn*	Sb*
E-1				5	-.1	147	0.30	-1	-0
E-2				11	-.1	82	-0.10	-1	-0
E-3				12	-.1	209	0.30	-1	-0
KV-1				2	-.1	534	0.20	-1	-0
KV-2				2	-.1	415	0.20	-1	-0
KV-3				7	-.1	983	-0.10	1	-0
NO0597.01	-3.0	-3.0	-5.0	-2	1.2	2	2.00		-2
NO0597.02	-3.0	-3.0	-5.0	-2	1.1	10	3.00		-2
OF-1				1		61	0.50	-1
OF-2				-1		18	0.20	-1

------------------

Sample No.	Bi*	Se*	Ga*	S%	V*	Cr*	Mn*	Fe%	Th*
E-1	-0	-0.50	3.20		78				1.40
E-2	-0	-0.50	1.70		57				0.60
E-3	-0	-0.50	13.10		-8				4.50
KV-1	-0	-0.50	4.00		77				3.40
KV-2	-0	-0.50	4.70		89				2.60
KV-3	-0	-0.50	17.60		50				6.40
NO0597.01	3			-.01	13	9	311	19.12	-2.00
NO0597.02	7			-.01	18	11	1348	18.10	-2.00
OF-1			6.30		52				1.50
OF-2			2.80		50				1.30

------------------

Sample No.	U*	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*	Cs*
E-1	0.30	1	19.6	37.9	24.1	35	2.10	0.10	1.50
E-2	-0.10	-1	8.8	228.5	20.1	15	0.70	0.10	0.30
E-3	-0.10	-1	19.6	405.3	28.4	118	10.90	0.50	0.90
KV-1	0.40	1	36.2	246.7	40.1	72	3.50	0.20	1.00
KV-2	0.50	1	49.0	117.2	25.5	73	3.50	0.20	3.20
KV-3	0.90	1	41.5	311.9	24.8	153	10.80	0.70	1.10
NO0597.01	-5.00	-2		50.0
NO0597.02	-5.00	2		96.0
OF-1	0.50	-1	2.4	321.2	29.4	30	1.70	-0.10	-0.10
OF-2	0.40	-1	5.1	210.4	19.0	47	2.80	0.20	-0.10

------------------

Sample No.	La*	Ce*	Pr*	Nd*	Sm*	Eu*	Gd*	Tb*	Dy*
E-1	9.80	19.20	2.21	9.50	1.96	0.47	2.08	0.41	2.77
E-2	4.50	8.90	1.16	5.50	1.38	0.31	1.54	0.29	2.12
E-3	21.30	40.00	4.96	20.70	3.92	0.94	4.33	0.74	5.04
KV-1	16.10	33.90	4.44	20.10	4.18	0.94	4.47	0.76	5.10
KV-2	12.30	25.80	2.94	12.10	2.71	0.73	2.89	0.52	3.22
KV-3	27.00	52.90	6.20	24.60	5.11	1.11	4.69	0.74	4.28
NO0597.01	-1.00
NO0597.02	1.00
OF-1	8.90	19.20	2.37	10.70	2.20	0.47	2.42	0.44	3.13
OF-2	7.50	16.30	2.06	8.20	1.80	0.41	1.84	0.32	2.34

------------------

Sample No.	Ho*	Er*	Tm*	Yb*	Lu*	B*	Be*	Hf*	Hg*
E-1	0.67	2.35	0.42	2.57	0.41		-1	0.80	-0
E-2	0.56	1.91	0.29	1.72	0.33		-1	0.30	-0
E-3	1.00	2.96	0.48	3.15	0.51		3	2.90	-0
KV-1	1.24	4.03	0.54	3.36	0.67		1	1.90	-0
KV-2	0.71	2.48	0.45	2.94	0.48		1	1.80	-0
KV-3	0.91	2.64	0.43	2.99	0.46		3	4.10	-0
NO0597.01						-3
NO0597.02						-3
OF-1	0.82	2.76	0.44	2.95	0.53			0.80
OF-2	0.53	1.70	0.28	1.76	0.28			0.90

------------------

Sample No.	Tl*
E-1	-0
E-2	-0
E-3	0
KV-1	-0
KV-2	0
KV-3	0
NO0597.01
NO0597.02
OF-1
OF-2

Oxide analyses

( All values are in % )

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
E-1	Dump	24.02	2.21	0.13	68.21	0.10	1.06	1.25
E-2	Dump	42.41	1.03	0.06	50.44	0.28	0.50	2.60
E-3	Dump	40.84	6.75	0.50	25.88	9.94	2.84	5.42
KV-1	Dump	24.81	4.67	0.31	61.48	0.19	1.40	2.61
KV-2	Dump	26.01	4.73	0.34	62.11	0.06	1.71	1.82
KV-3	Dump	53.60	11.01	0.65	8.21	7.73	2.42	5.10
OF-1	Block	30.66	2.71	0.11	57.79	0.10	1.00	3.58
OF-2	Block	30.07	1.92	0.12	52.37	0.23	2.65	5.74
Rana-1	Bedrock	48.14	6.70	0.42	30.18	0.12	2.07	5.40
Rana-2	Bedrock	20.30	3.30	0.19	30.37	0.60	7.09	16.44

------------------

Sample No.	Na2O	K2O	P2O5	Loss	Sum
E-1	0.20	0.62	0.75	0.55	99.00
E-2	0.08	0.28	0.55	1.87	100.00
E-3	4.39	0.49	0.32	2.87	100.00
KV-1	0.33	1.19	0.71	2.17	100.00
KV-2	0.04	1.52	0.56	1.00	100.00
KV-3	3.75	1.15	0.20	5.49	99.00
OF-1	0.66	0.09	0.47	2.77	100.00
OF-2	0.31	0.16	0.18	6.56	100.00
Rana-1	0.35	0.14	0.55	5.32	99.00
Rana-2	0.72	0.03	0.42	20.12	100.00

---

The fact sheet was created on 22.11.2024

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

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