Fact Sheet for <b>Occurence 1824

					Norsk versjon
	THE ORE DATABASE
	Occurence 1824 - 012 Stormo
	(Object Id: 2811) (Last updated: 28.04.2020)

Location

County:

Nordland

Municipality:

Vefsn (1824)

Map 1:50000:

Elsfjord (1927-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

435413 m.

North:

7328355 m.

Longitude:

13.5729950

Latitude:

66.0691770

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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:	Pitting	Reserves:
	Operating method:		Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Fe 25 % 29.10.1992

Operations

From - To Activity Comments

1912 - 1913 Pitting

1974 - 1978 Geology Company/Institution :Rana Gruber

1976 - 1976 Geophysics Company/Institution :Rana Gruber

Mineralization

Era: Proterozoic Period: Neoproterozoic

Genesis: Sedex Form: Layer

Main texture: Banded Min. distribution: Massive (>50 % ore minerals)

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

Strike/Dip: 180 / 70 Direction: 180

Plunge: 15

Stratigraphic classification of host rock

Era: Period:

Province: Caledonides

Geotec.unit: Helgeland Nappe Complex

Tectonic complex:

Igneous complex:

Group: Elsfjord gruppen Formation: jernmalmformasjon

Mineralogy

Relationship Mineral Amount

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Amphibole Major mineral (>10%)

Gangue mineral Apatite Subordinate mineral (1-10%)

Ore mineral Magnetite Major mineral (>10%)

Ore mineral Hematite Subordinate mineral (1-10%)

Lithology:

Relationship Rock Origin

Unknown Kvartsdioritt Intrusive
Original rock :Diorite

Metamorphic facies :Amphibolite

Unknown Gabbro Intrusive
Original rock :Gabbro

Metamorphic facies :Amphibolite

Structures

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

Unknown Primary layering Strike/Dip :180 / 70 Syn-mineralisation ;...Effect :None

Information(s) in free text format

Free text

The Stormo IF is completely enclosed within Nilsfjellet quartz diorite. Thin bands and dissemination of magnetite are found in calcareous epidote-amphibole rock in a few minor outcrops (Samples JS_FE1736-37). The thickness of the IF is assumed to be around 20 m although the contacts to the wall-rocks is not observed. Only a few scattered outcrops of the quartz diorite occurs in the surrounding area.

Bibliography:

From NGU's Reference Archive:

Krum, R. , 1911

Davemoen og Stormoen Jernfelter ved Elsfjorden i Rana, Nordland

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1662;8 pages

Abstract:

Lok. Nr. 40455. 40456, 40458, 40460. Malmsonene ligger i sedimentære bergarter med bl.a kalksteiner og er sterkt presset og foldet. Mineraliseringen opptrer i hovedsak som magnetitt med noe hematitt og all malm er oppredningsmalm. Følgende undersøkelsesarbeider er gjort: - Systematisk magnetometriske undersøkelse. - Topografisk kartlegging i M 1:1000, 1:2000, og 1:4000. - Nivellement i jernfeltene. - Avdekking-, overskjærings- og sprengningsarbeider - Prøvetaking av malm - Anbringelse av jernbolter - Malmberegninger og driftsoverslag.

Fieldsamples

Sample No. Sample type Miscellanrous

JS_FE1736 Bedrock

Sampler: J.S. Sandstad

Comment: Banded magnetite dissemination in amphibole matrix

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

NO0699.02 Bedrock

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

Comment: Fink. mt.-min., nedre malmlinse.

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: 4123 12,00,01)

Location

County: Nordland Municipality: Vefsn (1824)

Map 1:50000: Elsfjord (1927-3) Map 1:250000: Mo i Rana

Coordinate system: EU89-UTM Zone 33

East: 435482 m. North: 7328277 m.

Longitude: 13.5745730 Latitude: 66.0684920

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Resource

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

Element(s): Fe

Fieldsamples

Sample No. Sample type Miscellanrous

NO0699.01 Bedrock

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

Comment: Fink. mt.-min., øvre malmlinse.

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: 36439 12,00,02)

Location

County: Nordland Municipality: Vefsn (1824)

Map 1:50000: Elsfjord (1927-3) Map 1:250000: Mo i Rana

Coordinate system: EU89-UTM Zone 33

East: 435432 m. North: 7328364 m.

Longitude: 13.5734080 Latitude: 66.0692620

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Resource

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

Element(s): Fe

Fieldsamples

Sample No. Sample type Miscellanrous

JS_FE1737 Bedrock

Sampler: J.S. Sandstad

Comment: Magnetite dissemination in amphibole matrix

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 1824 - 012 Stormo

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_FE1736 Bedrock 2 29 1 12 11 1.7

JS_FE1737 Bedrock 3 26 1 12 14 1.9

NO0699.01 Bedrock 13 15 4 4 19 -.3 4.0

NO0699.02 Bedrock 7 14 3 -1 10 -.3 -2.0

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

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

JS_FE1736 1 75 0.40 2

JS_FE1737 1 12 1.10 1

NO0699.01 -3.0 -3.0 -5.0 15 2.8 2 3.00 12

NO0699.02 -3.0 -3.0 -5.0 2 1.7 7 -1.00 -2

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

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

JS_FE1736 -0.50 10.70 98 5.30

JS_FE1737 -0.50 8.40 113 5.00

NO0699.01 31 .03 49 23 1491 30.81 2.00

NO0699.02 15 .02 37 20 833 21.25 3.00

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

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

JS_FE1736 1.70 -1 13.8 118.7 25.9 93 10.50 0.60 -0.10

JS_FE1737 2.40 -1 1.9 503.1 21.0 117 13.60 0.70 -0.10

NO0699.01 -5.00 -2 37.0

NO0699.02 -5.00 -2 44.0

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

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

JS_FE1736 24.00 53.90 5.77 22.50 4.71 1.22 4.74 0.76 4.40

JS_FE1737 20.00 41.30 4.78 19.20 3.71 0.86 3.49 0.54 3.52

NO0699.01 6.00

NO0699.02 11.00

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

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

JS_FE1736 0.90 2.73 0.38 2.55 0.38 -1 2.30

JS_FE1737 0.72 2.20 0.32 2.11 0.33 8 3.10

NO0699.01 -3

NO0699.02 -3

Oxide analyses
( All values are in % )

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

JS_FE1736 Bedrock 37.10 5.56 0.44 44.40 0.53 3.70 6.81

JS_FE1737 Bedrock 36.50 7.04 0.65 30.70 0.75 6.82 16.30

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

Sample No. Na2O K2O P2O5 Loss Sum

JS_FE1736 1.00 0.65 0.32 -0.85 100.00

JS_FE1737 0.41 0.18 0.41 -0.07 100.00

	Element/product	Crude ore grade or quality	Reg. date
	Fe	25 %	29.10.1992

From - To	Activity	Comments
1912 - 1913	Pitting
1974 - 1978	Geology	Company/Institution :Rana Gruber
1976 - 1976	Geophysics	Company/Institution :Rana Gruber

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

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

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

Relationship	Rock	Origin
Unknown	Kvartsdioritt	Intrusive Original rock :Diorite
		Metamorphic facies :Amphibolite
Unknown	Gabbro	Intrusive Original rock :Gabbro
		Metamorphic facies :Amphibolite

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Unknown	Primary layering	Strike/Dip :180 / 70	Syn-mineralisation ;...Effect :None

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
JS_FE1736	Bedrock	2	29	1	12	11		1.7
JS_FE1737	Bedrock	3	26	1	12	14		1.9
NO0699.01	Bedrock	13	15	4	4	19	-.3	4.0
NO0699.02	Bedrock	7	14	3	-1	10	-.3	-2.0

Sample No.	Pt#	Pd#	Rh#	As*	Cd*	Ba*	Mo*	Sn*	Sb*
JS_FE1736				1		75	0.40	2
JS_FE1737				1		12	1.10	1
NO0699.01	-3.0	-3.0	-5.0	15	2.8	2	3.00		12
NO0699.02	-3.0	-3.0	-5.0	2	1.7	7	-1.00		-2

Sample No.	Bi*	Se*	Ga*	S%	V*	Cr*	Mn*	Fe%	Th*
JS_FE1736		-0.50	10.70		98				5.30
JS_FE1737		-0.50	8.40		113				5.00
NO0699.01	31			.03	49	23	1491	30.81	2.00
NO0699.02	15			.02	37	20	833	21.25	3.00

Sample No.	U*	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*	Cs*
JS_FE1736	1.70	-1	13.8	118.7	25.9	93	10.50	0.60	-0.10
JS_FE1737	2.40	-1	1.9	503.1	21.0	117	13.60	0.70	-0.10
NO0699.01	-5.00	-2		37.0
NO0699.02	-5.00	-2		44.0

Sample No.	La*	Ce*	Pr*	Nd*	Sm*	Eu*	Gd*	Tb*	Dy*
JS_FE1736	24.00	53.90	5.77	22.50	4.71	1.22	4.74	0.76	4.40
JS_FE1737	20.00	41.30	4.78	19.20	3.71	0.86	3.49	0.54	3.52
NO0699.01	6.00
NO0699.02	11.00

Sample No.	Ho*	Er*	Tm*	Yb*	Lu*	B*	Be*	Hf*
JS_FE1736	0.90	2.73	0.38	2.55	0.38		-1	2.30
JS_FE1737	0.72	2.20	0.32	2.11	0.33		8	3.10
NO0699.01						-3
NO0699.02						-3

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
JS_FE1736	Bedrock	37.10	5.56	0.44	44.40	0.53	3.70	6.81
JS_FE1737	Bedrock	36.50	7.04	0.65	30.70	0.75	6.82	16.30

Sample No.	Na2O	K2O	P2O5	Loss	Sum
JS_FE1736	1.00	0.65	0.32	-0.85	100.00
JS_FE1737	0.41	0.18	0.41	-0.07	100.00