Fact Sheet for <b>Occurence 1836

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Occurence 1836 - 308 Steintuva
	(Object Id: 7460) (Last updated: 10.01.2022)

Location

County:

Nordland

Municipality:

Rødøy (1836)

Map 1:50000:

Melfjorden (1928-3)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

427733 m.

North:

7400247 m.

Longitude:

13.3617910

Latitude:

66.7122070

Show on map

Resource

Resource Type:

Olivine

Resource Subtype:

Olivine

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Exploration	Reserves:
	Operating method:		Historical production:

Mineralization

Era: Paleozoic Period:

Genesis: Liquid magmatic Form: Lens

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

Main grain size: Coarse grained (> 3 mm)

Strike/Dip: Direction: 80

Plunge: 90

Stratigraphic classification of host rock

Era: Paleozoic Period:

Province:

Geotec.unit:

Tectonic complex: Rødingsfjelldekkekom

Igneous complex:

Group: Formation:

Mineralogy

Mineral Amount

Olivine Major mineral (>10%)

Enstatite Major mineral (>10%)

Magnesite Accessory mineral (<1%)

Talc Accessory mineral (<1%)

Spinel Accessory mineral (<1%)

Structures

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

Wall rock Schistosity Strike/Dip :90 / 80 Pre-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

300x100 m stor linse av grovkornet harzburgitt. Består av enstatitt, olivin og mindre mengder talk, glimmer, magnesitt og spinell. Olivinen ser frisk ut. Det er ikke sett større partier med dunitt, slik at som råstoff for olivin er kroppen neppe aktuell. Det er tatt ut litt kromitt i noen mindre skjerp. Nesten ikke noe kromitt er synlig idag.

Bibliography:

From NGU's Reference Archive:

Gautneb, Håvard , 1997

Resultater fra regionale olivin- og serpentinundersøkelser i Norge 1996

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.97.043;60 pages

Korneliussen, Are , 1976

Malmgeologisk undersøkelse med henblikk på økonomisk utnyttelse av kromittforekomstene på kartbladene Rødøy og Lurøy.

;NTH Bergavd.;AVHANDLING

Karlsen, Tor Arne ; Gautneb, Håvard ; Lund, Bjørn , 1999

Status-report on talc-prospecting in Helgeland, northern Norway.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.99.068;? pages

Abstract:

A prospecting programme for talc has been carried out in Helgeland. The results are both good and bad; a new talc deposit has been found in Kvanndalen, a few km west of Altermark. The deposit are exposed, and the size is not yet known, except that the maximum width is around 50 metres. To be able to use th ore, there must either be a market for the assemblage talc-breunnerit-olivine, or it must be possible to remove the olivine. A further deposit of interest occurs in Misvær. Otherwise, talc is rather uncommon in the numerous ultramafic lenses around the Høgtuva-, Sjona- and Svartisen windows. The ultramafic lenses are dominated by the metamorphic assemblage enstatite-anthophyllite-carbonate with or without olivine. It is concluded that the metamorphic grade has, in general, been too high in the western area and that possible pre-existing talc-carbonate assemblages have been altered to the minerals above. The deposit in Kvanndalen probably represent the margin of what can be termed the Altermark Talc Province. Only olivine has been included in the talc-carbonate assemblage, while bodies further to the west carry olivine, enstatite and anthophyllite.

Fieldsamples

Sample No. Sample type Miscellanrous

NGUAK96053 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

NGUAK96054 Bedrock

Comment: This is a dummy sample that does not excists. The assosciated analyses have been compiled from various published and unpublished reports

No. of registrated oxide analyses = 1

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

Analyse Results

from

Deposit Area 1836 - 308 Steintuva

Oxide analyses
( All values are in % )

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

NGUAK96053 Bedrock 41.90 0.83 0.00 9.30 0.10 38.00 0.33

NGUAK96054 Bedrock 44.10 0.84 0.00 8.60 0.11 36.40 1.97

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

Sample No. Na2O K2O P2O5 Loss Sum

NGUAK96053 0.00 0.00 0.00 8.01 98.00

NGUAK96054 0.01 0.00 0.00 6.13 98.00

Era:	Paleozoic	Period:
Genesis:	Liquid magmatic	Form:	Lens
Main texture:	Structureless	Min. distribution:	Massive (>50 % ore minerals)

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

	Mineral	Amount
	Olivine	Major mineral (>10%)
	Enstatite	Major mineral (>10%)
	Magnesite	Accessory mineral (<1%)
	Talc	Accessory mineral (<1%)
	Spinel	Accessory mineral (<1%)

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Schistosity	Strike/Dip :90 / 80	Pre-mineralisation ;...Effect :Modifies

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
NGUAK96053	Bedrock	41.90	0.83	0.00	9.30	0.10	38.00	0.33
NGUAK96054	Bedrock	44.10	0.84	0.00	8.60	0.11	36.40	1.97

Sample No.	Na2O	K2O	P2O5	Loss	Sum
NGUAK96053	0.00	0.00	0.00	8.01	98.00
NGUAK96054	0.01	0.00	0.00	6.13	98.00