Fact Sheet for <b>Occurence 1824 - 031 Dolstadåsen IV</b>

					Norsk versjon
	THE ORE DATABASE
	Occurence 1824 - 031 Dolstadåsen IV
	(Object Id: 2904) (Last updated: 28.04.2020)

Location

County:

Nordland

Municipality:

Vefsn (1824)

Map 1:50000:

Fustvatnet (1926-4)

Map 1:250000:

Mosjøen

Coordinate system:

EU89-UTM Zone 33

East:

419930 m.

North:

7304677 m.

Longitude:

13.2457100

Latitude:

65.8532980

Show on map

Resource

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

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Test mining	Reserves:
	Operating method:	Underground mining	Historical production:	,2 thousand tons

Operations

From - To Activity Comments

1940 - 1940 Geophysics

Mineralization

Era: Paleozoic Period:

Genesis: Volcex Form: Layer

Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)

Main grain size: Fine grained (< 1 mm) Main alteration: Epidotisation

Strike/Dip: 20 / 90 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period:

Province: Caledonides

Geotec.unit: Helgeland Nappe Complex

Tectonic complex: Øverste allokton

Igneous complex:

Group: Formation: Skjervenheten

Mineralogy

Relationship Mineral Amount

Gangue mineral Epidote Major mineral (>10%)

Gangue mineral Amphibole Major mineral (>10%)

Gangue mineral Calcite Subordinate mineral (1-10%)

Gangue mineral Plagioclase Subordinate mineral (1-10%)

Gangue mineral Garnet Subordinate mineral (1-10%)

Gangue mineral Quartz Subordinate mineral (1-10%)

Ore mineral Magnetite Major mineral (>10%)

Ore mineral Hematite Subordinate mineral (1-10%)

Ore mineral Pyrite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Host rock amfibolitt Extrusive
Original rock :Basalt

Metamorphic facies :Amphibolite

Structures

Location: Type: Orientation(360 gr.): Relation to min.:

Host rock Foliation Strike/Dip :20 / 90 Post-mineralisation ;...Effect :None

Host rock Primary layering Strike/Dip :20 / 90 Syn-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

Se NO0728 for historikk. Mineraliseringen er en båndet, finkornet jernformasjon lik de andre i Dolstadåsen, bortsett fra at her opptrer litt hematitt i tillegg til magnetitt og noe svovelkis. Området er overdekket, men Kvalheim (1940), som har foretatt magnetometermåling, oppgir strøklengden til 800m og mektigheten til ca.40m. Ved UTM 419980 7304920 er det drevet inn en stoll mot vest. Det er endel magnetittbånd i amfibolitten (+-epidot) i hele stollengden, mest i inngangspartiet. Prøve 01 er semimassiv magnetittmalm i amfibolitt. Iflg. Kvalheim (1940) er stollen drevet inn i de fattigste malmpartier langs liggen. Jernformasjonen gjennomveves av endel cm-tykke hornblendetonalittårer. Hornblendetonalitt er blottet ca. 100m øst for stollen.

Bibliography:

From NGU's Reference Archive:

Remmen, K. , 1922

Kortfattede opplysninger vedkommende Chr. Ankers dødsbos grubefelter.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 911;8 pages

Abstract:

Dokumentet gir opplysninger om grubefeltene tilhørende Chr. Ankers dødsbo. Feltene er: I Nordland: Saltdalens kobberfelter (Ingeborg, Baldoivi og Stålhaugen), Gjærvalens kobberfelter, Selvåg jernfelt, Hjeldsand jernfelt og Halsåsen- Høgåsen jernfelt. I Troms: Skogfjord Svovelkisfelt. I Finnmark: Sløkdalens kobberfelt. Med i dødsboet men ikke beskrevet her er to jernmalmanvisninger på Dønnes, Helgeland og en anvisning i Vaddasgaisa.

Fieldsamples

Sample No. Sample type Miscellanrous

DOL-4-C Bedrock

Sampler: P.M. Ihlen

Comment: Finkornet foliert magnetittmalm med sulfiddisseminasjon

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

DOL-4-D Bedrock

Sampler: P.M. Ihlen

Comment: Fk semi-massiv mt.malm fink sulf. diss og striper og brunt gnt b†nd

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

DOL-4-E Bedrock

Sampler: P.M. Ihlen

Comment: M›rkt gr›nlig fink semi-massiv mt-malm med cm-bred granitt-slire

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

NO0801.01 Bedrock

Sampler: Wilberg, R./...Stored: Løkken

Comment: Fink. amf. med semimassiv mt-min.

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 1824 - 031 Dolstadåsen IV

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#

DOL-4-C Bedrock 6 45 0 16 14 -.5

DOL-4-D Bedrock 12 28 0 19 17 .6

DOL-4-E Bedrock 35 15 1 19 10 2.2

NO0801.01 Bedrock 16 38 3 25 22 .1 2.0

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

Sample No. Pt# Pd# As* Cd* Ba* Mo* Sn* Sb* Bi*

DOL-4-C 1 13 0.60 2

DOL-4-D 2 19 0.60 2

DOL-4-E 4 42 0.50 1

NO0801.01 3.0 3.0 2 .2 3 1.00 2 2

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

Sample No. Se* Ga* S% V* Cr* Mn* Fe% Th* U*

DOL-4-C -0.50 11.40 184 0.60 0.20

DOL-4-D -0.50 11.20 120 0.80 0.20

DOL-4-E 0.70 14.70 169 0.90 0.20

NO0801.01 .37 57 41 877 18.17 2.00 5.00

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

Sample No. W* Rb* Sr* Y* Zr* Nb* Ta* Cs* La*

DOL-4-C -1 3.2 282.2 12.4 45 1.60 0.10 0.40 11.30

DOL-4-D -1 1.5 279.7 21.7 56 2.10 0.10 -0.10 13.10

DOL-4-E -1 4.3 690.2 25.1 68 1.60 0.10 0.20 11.10

NO0801.01 1 63.0 5.00

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

Sample No. Ce* Pr* Nd* Sm* Eu* Gd* Tb* Dy* Ho*

DOL-4-C 23.00 2.82 12.10 2.59 0.57 2.57 0.39 2.33 0.45

DOL-4-D 34.60 4.52 20.10 4.49 0.84 4.45 0.69 4.11 0.83

DOL-4-E 29.00 4.31 21.30 4.82 1.15 5.37 0.83 4.94 0.99

NO0801.01

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

Sample No. Er* Tm* Yb* Lu* B* Be* Hf*

DOL-4-C 1.37 0.20 1.31 0.23 -1 1.30

DOL-4-D 2.44 0.32 2.12 0.36 -1 1.80

DOL-4-E 2.67 0.38 2.36 0.38 -1 2.10

NO0801.01 2

Oxide analyses
( All values are in % )

Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MnO MgO CaO

DOL-4-C Bedrock 32.30 2.93 0.45 42.80 0.68 5.75 14.80

DOL-4-D Bedrock 33.30 3.42 0.65 39.70 0.69 6.20 15.10

DOL-4-E Bedrock 42.50 8.69 0.92 19.70 0.35 8.18 17.40

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

Sample No. Na2O K2O P2O5 Loss Sum

DOL-4-C 0.42 0.03 0.38 -1.01 100.00

DOL-4-D 0.53 0.08 0.61 -0.84 99.00

DOL-4-E 0.77 0.16 0.42 0.39 99.00

Era:	Paleozoic	Period:
Genesis:	Volcex	Form:	Layer
Main texture:	Banded	Min. distribution:	Semi-massive (20-50 % ore minerals)

	Province:	Caledonides
	Geotec.unit:	Helgeland Nappe Complex
	Tectonic complex:	Øverste allokton
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Epidote	Major mineral (>10%)
Gangue mineral	Amphibole	Major mineral (>10%)
Gangue mineral	Calcite	Subordinate mineral (1-10%)
Gangue mineral	Plagioclase	Subordinate mineral (1-10%)
Gangue mineral	Garnet	Subordinate mineral (1-10%)
Gangue mineral	Quartz	Subordinate mineral (1-10%)
Ore mineral	Magnetite	Major mineral (>10%)
Ore mineral	Hematite	Subordinate mineral (1-10%)
Ore mineral	Pyrite	Accessory mineral (<1%)

Relationship	Rock	Origin
Host rock	amfibolitt	Extrusive Original rock :Basalt
		Metamorphic facies :Amphibolite

Location:	Type:	Orientation(360 gr.):	Relation to min.:
Host rock	Foliation	Strike/Dip :20 / 90	Post-mineralisation ;...Effect :None
Host rock	Primary layering	Strike/Dip :20 / 90	Syn-mineralisation ;...Effect :Controls

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
DOL-4-C	Bedrock	6	45	0	16	14		-.5
DOL-4-D	Bedrock	12	28	0	19	17		.6
DOL-4-E	Bedrock	35	15	1	19	10		2.2
NO0801.01	Bedrock	16	38	3	25	22	.1	2.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
DOL-4-C			1		13	0.60	2
DOL-4-D			2		19	0.60	2
DOL-4-E			4		42	0.50	1
NO0801.01	3.0	3.0	2	.2	3	1.00		2	2

Sample No.	Se*	Ga*	S%	V*	Cr*	Mn*	Fe%	Th*	U*
DOL-4-C	-0.50	11.40		184				0.60	0.20
DOL-4-D	-0.50	11.20		120				0.80	0.20
DOL-4-E	0.70	14.70		169				0.90	0.20
NO0801.01			.37	57	41	877	18.17	2.00	5.00

Sample No.	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*	Cs*	La*
DOL-4-C	-1	3.2	282.2	12.4	45	1.60	0.10	0.40	11.30
DOL-4-D	-1	1.5	279.7	21.7	56	2.10	0.10	-0.10	13.10
DOL-4-E	-1	4.3	690.2	25.1	68	1.60	0.10	0.20	11.10
NO0801.01	1		63.0						5.00

Sample No.	Ce*	Pr*	Nd*	Sm*	Eu*	Gd*	Tb*	Dy*	Ho*
DOL-4-C	23.00	2.82	12.10	2.59	0.57	2.57	0.39	2.33	0.45
DOL-4-D	34.60	4.52	20.10	4.49	0.84	4.45	0.69	4.11	0.83
DOL-4-E	29.00	4.31	21.30	4.82	1.15	5.37	0.83	4.94	0.99
NO0801.01

Sample No.	Er*	Tm*	Yb*	Lu*	B*	Be*	Hf*
DOL-4-C	1.37	0.20	1.31	0.23		-1	1.30
DOL-4-D	2.44	0.32	2.12	0.36		-1	1.80
DOL-4-E	2.67	0.38	2.36	0.38		-1	2.10
NO0801.01					2

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
DOL-4-C	Bedrock	32.30	2.93	0.45	42.80	0.68	5.75	14.80
DOL-4-D	Bedrock	33.30	3.42	0.65	39.70	0.69	6.20	15.10
DOL-4-E	Bedrock	42.50	8.69	0.92	19.70	0.35	8.18	17.40

Sample No.	Na2O	K2O	P2O5	Loss	Sum
DOL-4-C	0.42	0.03	0.38	-1.01	100.00
DOL-4-D	0.53	0.08	0.61	-0.84	99.00
DOL-4-E	0.77	0.16	0.42	0.39	99.00