Norsk versjon
	THE ORE DATABASE
	Occurence 1827 - 001 Dønna
	(Object Id: 2382) (Last updated: 26.04.2020)

Products

	Element/product	Crude ore grade or quality	Reg. date
	Fe-total	40 %	28.10.1992

Operations

	From - To	Activity	Comments
	1982 - 1982	Geology

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Genesis:	Sedex	Form:	Layer
	Main texture:	Banded	Min. distribution:	Massive (>50 % ore minerals)

Main grain size:

Coarse grained (> 3 mm)

Main alteration:

	Strike/Dip:	240 / 60	Direction:	65
			Plunge:	20

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Neoproterozoic

	Province:
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

Group:

Formation:

Dunderland-Neverhaugen jernmalmformasjon

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Zircon
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Amphibole	Major mineral (>10%)
	Gangue mineral	Pyroxene	Major mineral (>10%)
	Gangue mineral	Epidote	Subordinate mineral (1-10%)
	Gangue mineral	Garnet	Subordinate mineral (1-10%)
	Gangue mineral	Apatite	Subordinate mineral (1-10%)
	Ore mineral	Hematite	Major mineral (>10%)
	Ore mineral	Magnetite	Major mineral (>10%)

Lithology:

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

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Unknown	Primary layering	Strike/Dip :335 / 20	Syn-mineralisation ;...Effect :None

Information(s) in free text format

Free text

Iron mineralisation has been registered at several localities at Nordøya and Sørøya in the northernmost part of Dønna. It seems to be associated a sequence of tremolite-bearing dolomite marble and calcite marble. In a minor bay on Sørøya, magnetite occurs in various rocks in scattered outcrops. Nearly flat-lying granitic gneiss is found in the lowermost part of the section. It is overlain by banded calcite marble (2-4 m thick) followed by lensoid, magnetite-bearing pyroxene-amphibole-quartz skarn (10-40 cm) (Sample JSFE15.18) and massive magnetite in amphibole-garnet-quartz- rock (10-20 cm) (Sample JSFE15.19). A thin layer of calcite marble (0.5-1 m) is then overlain by green, fine grained pyroxene-rich? rock with some magnetite dissemination (Sample JSFE15.17). On top is located banded calcite marble. The magnetite-bearing rock also contains locally some Fe-sulphides, giving the rock a rusty appearance. The whole sequence resembles more skarn-type mineralisation and is thus unlike Dunderlandsdalen IF, although it has a stratiform appearance.

Bibliography:

From NGU's Reference Archive:

Vogt, J.H.L.

	Dønna jernmalmfelt.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 2744;2 pages

	Abstract:
	Rapporten gir en kort beskrivelse av jernmalmforekomstene på Dønna i Nordland. Mineraliseringen opptrer som magnetitt og forekomstene er små og fattige.

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

Søvegjarto, U. 1983: Dønna jernmalmfelt. Sluttrapport geologi. 8 sider. 24 bilag.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JSFE15.18	Bedrock	Comment: Banded magnetite-hematite in pyroxen-amphibole skarn No. of registrated element analyses = 2 No. of registrated oxide analyses = 2
	NO0239.01	Bedrock	Sampler: Lindahl, I./...Stored: Løkken Comment: Båndet granatskarnmalm. Finbåndet middelskornig med magnetitt og hematitt. No. of registrated element analyses = 1
	NO0239.02	Bedrock	Sampler: Lindahl, I./...Stored: Løkken Comment: Grovkornig massiv jernmalm. Vesentlig magnetitt med epidot i bånd. No. of registrated element analyses = 1

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

Name of Locality: Skreiingen

(Object Id: 6836 1,01,00)

Location

County:

Nordland

Municipality:

Dønna (1827)

Map 1:50000:

Sandnessjøen (1827-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

390433 m.

North:

7345647 m.

Longitude:

12.5652200

Latitude:

66.2117920

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:

Information(s) in free text format

Description

Anomali med 1 m mektighet og 150 m lengde.

Name of Locality: Sjåholmen I

(Object Id: 6837 1,02,00)

Location

County:

Nordland

Municipality:

Dønna (1827)

Map 1:50000:

Sandnessjøen (1827-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

390144 m.

North:

7346110 m.

Longitude:

12.5584180

Latitude:

66.2158360

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:

Information(s) in free text format

Free text

Green, fine grained pyroxene-amphibole rock with some magnetite dissemination is exposed in north-facing, minor cliff.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JSFE15.17	Bedrock	Comment: Semi-massive to disseminated magnetite in pyroxene-amphibole rock No. of registrated element analyses = 2 No. of registrated oxide analyses = 2

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

Name of Locality: Sjåholmen II

(Object Id: 6838 1,03,00)

Location

County:

Nordland

Municipality:

Dønna (1827)

Map 1:50000:

Sandnessjøen (1827-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

390100 m.

North:

7346122 m.

Longitude:

12.5574280

Latitude:

66.2159320

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:

Information(s) in free text format

Free text

10-20 cm thick layer of massive magnetite in amphibole-garnet-quartz rock overlies granitic gneiss.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	JSFE15.19	Bedrock	Comment: Massive, coarse grained magnetite in quartz-hornblende-garnet-pyroxene rock No. of registrated element analyses = 2 No. of registrated oxide analyses = 2

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

Name of Locality: Øytangen

(Object Id: 6839 1,04,00)

Location

County:

Nordland

Municipality:

Dønna (1827)

Map 1:50000:

Sandnessjøen (1827-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

390083 m.

North:

7346248 m.

Longitude:

12.5569310

Latitude:

66.2170480

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:

Information(s) in free text format

Description

Anomali med 1,5 m mektighet og 200 m lengde.

Name of Locality: Synstholmen

(Object Id: 6840 1,05,00)

Location

County:

Nordland

Municipality:

Dønna (1827)

Map 1:50000:

Sandnessjøen (1827-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

389933 m.

North:

7346547 m.

Longitude:

12.5533400

Latitude:

66.2196840

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:

Information(s) in free text format

Description

Anomali med 4,5 m mektighet og 50 m lengde.

Name of Locality: Nordøya I

(Object Id: 6841 1,06,00)

Location

County:

Nordland

Municipality:

Dønna (1827)

Map 1:50000:

Sandnessjøen (1827-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

391283 m.

North:

7346698 m.

Longitude:

12.5831880

Latitude:

66.2215000

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:

Information(s) in free text format

Description

Anomali med 2 m mektighet og 250 m lengde.

Name of Locality: Nordøya II

(Object Id: 6842 1,07,00)

Location

County:

Nordland

Municipality:

Dønna (1827)

Map 1:50000:

Sandnessjøen (1827-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

391033 m.

North:

7346598 m.

Longitude:

12.5777220

Latitude:

66.2205170

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:

Information(s) in free text format

Description

Anomali med 1 m mektighet og 150 m lengde.

---

Analyse Results

from

Deposit Area 1827 - 001 Dønna

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#
JSFE15.17	Bedrock
JSFE15.17	Bedrock				6
JSFE15.18	Bedrock
JSFE15.18	Bedrock				6
JSFE15.19	Bedrock				14
JSFE15.19	Bedrock
NO0239.01	Bedrock	35	32	47	69	299	-.3	6.0
NO0239.02	Bedrock	10	6	4	-1	14	-.3	-2.0

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

Sample No.	Pt#	Pd#	Rh#	As*	Cd*	Ba*	Mo*	Sn*	Sb*
JSFE15.17						95		-5
JSFE15.17						81
JSFE15.18						110		-5
JSFE15.18						110
JSFE15.19						31
JSFE15.19						36		-5
NO0239.01	-3.0	-3.0	-5.0	6	-.2	256	-1.00		2
NO0239.02	-3.0	-3.0	-5.0	7	-.2	29	-1.00		-2

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

Sample No.	Bi*	Ga*	S%	V*	Cr*	Mn*	Fe%	Th*	U*
JSFE15.17		9.20		132	92			4.21	1.37
JSFE15.17		6.20		68				3.20	0.70
JSFE15.18		4.90		61	24			1.87	0.49
JSFE15.18		2.70		68				1.70	0.30
JSFE15.19		5.10		74				1.80	0.20
JSFE15.19		7.90		83	34			1.38	0.43
NO0239.01	-2		.04	112	28	8015	13.26	4.00	7.00
NO0239.02	-2		-.01	33	16	994	28.46	-2.00	-5.00

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

Sample No.	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*	Cs*	La*
JSFE15.17	4	9.0	429.1	22.6	72	1.00	0.30	0.36	15.40
JSFE15.17	-1	7.2	427.6	23.2	86	6.70	0.30	0.10	16.80
JSFE15.18	2	8.4	296.5	21.8	38	-1.00	-0.10	0.20	9.40
JSFE15.18	-1	6.8	317.1	22.2	45	3.40	0.20	-0.10	10.50
JSFE15.19	-1	1.7	159.8	24.0	45	4.20	0.20	-0.10	7.40
JSFE15.19	4	5.5	157.7	23.5	60	-1.00	-0.10	0.11	6.30
NO0239.01	3		132.0						21.00
NO0239.02	-2		75.0						1.00

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

Sample No.	Ce*	Pr*	Nd*	Sm*	Eu*	Gd*	Tb*	Dy*	Ho*
JSFE15.17	36.20	4.05	17.80	3.38	0.81	5.01	0.59	4.16	0.84
JSFE15.17	34.90	4.05	16.80	3.52	0.79	3.56	0.57	3.62	0.80
JSFE15.18	22.10	2.88	11.80	2.51	0.61	4.03	0.37	3.22	0.77
JSFE15.18	21.50	2.60	11.80	2.18	0.55	2.85	0.44	3.24	0.76
JSFE15.19	16.50	2.11	8.70	2.37	0.59	2.90	0.46	3.23	0.78
JSFE15.19	16.70	2.08	10.90	2.33	0.54	4.19	0.48	3.43	0.78
NO0239.01
NO0239.02

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

Sample No.	Er*	Tm*	Yb*	Lu*	B*	Be*	Hf*
JSFE15.17	2.44	0.41	2.68	0.42			1.90
JSFE15.17	2.50	0.36	2.43	0.41		1	2.00
JSFE15.18	2.02	0.39	2.32	0.36			1.20
JSFE15.18	2.26	0.33	2.26	0.39		1	0.90
JSFE15.19	2.52	0.36	2.76	0.49		2	1.10
JSFE15.19	2.54	0.40	2.79	0.47			1.70
NO0239.01					-3
NO0239.02					-3

Oxide analyses

( All values are in % )

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
JSFE15.17	Bedrock	39.21	4.42	0.32	39.46	0.21	3.99	9.21
JSFE15.17	Bedrock	39.80	4.70	0.34	41.30	0.19	4.07	9.40
JSFE15.18	Bedrock	21.40	2.27	0.18	66.80	0.32	2.49	6.12
JSFE15.18	Bedrock	19.25	2.14	0.12	66.45	0.30	2.39	5.84
JSFE15.19	Bedrock	32.40	3.22	0.23	57.90	0.51	1.63	4.59
JSFE15.19	Bedrock	31.59	3.09	0.24	58.43	0.45	1.42	4.53

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

Sample No.	Na2O	K2O	P2O5	Loss	Sum
JSFE15.17	0.83	0.20	0.42	0.16	98.00
JSFE15.17	0.79	0.21	0.45	-0.02	101.00
JSFE15.18	0.41	0.18	0.52	-1.37	99.00
JSFE15.18	0.41	0.16	0.54	-1.50	96.00
JSFE15.19	0.27	0.19	0.64	-1.65	100.00
JSFE15.19	0.29	0.19	0.68	-1.36	100.00

---

The fact sheet was created on 02.05.2024

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

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