Norsk versjon
	THE ORE DATABASE
	Deposit Area 1833 - 085
	(Last updated 06.feb.2017)

Importance

Public:

Not Assessed (reg. 18.02.2015)

Economical:

Not classified/evaluated

Operations

	From - To	Activity	Comments
	1984 - 1984	Geophysics
	2009 - 2009	Geology	Company/Institution :NGU
			Sampling, analysis w/portable XRF

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:		Method:
	Genesis:	Volcex	Form:	Lens
	Main texture:	Vein network	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

	Strike/Dip:	85 / 80	Direction:	75
			Plunge:	30

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Neoproterozoic

	Province:	Caledonides
	Geotec.unit:	Rødingsfjell Nappe Complex
	Tectonic complex:	Uppermost Allochthon
	Igneous complex:

Group:

Mofjell Group

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Muscovite	Major mineral (>10%)
	Gangue mineral	Potassic feldspar	Major mineral (>10%)
	Gangue mineral	Plagioclase	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Pyrite	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Sphalerite	Subordinate mineral (1-10%)
	Ore mineral	Galena	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Muskovittgneis	Extrusive Original rock :Tuff
			Metamorphic facies :Amphibolite
	Wall rock	Hornblendegneis	Extrusive Original rock :Tuff
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Fold axis	Strike/Dip :75 / 30	Post-mineralisation ;...Effect :Modifies
	Host rock	Foliation	Strike/Dip :85 / 80	Post-mineralisation ;...Effect :None

Information(s) in free text format

Free text

The Stangfjell-Hellerfjell zone is defined by a strongly deformed, folded layer of mainly rusty muscovite gneiss, which stretches from Stangfjellet in the north to Hellerfjellet in the south, a length of more than 20 km along strike. There have been some exploration at three different places along the zone, namely at Stangfjellet, Rognhaugbekken and Hellerfjellet. Exploration work during an NGU project 2008-2009 resulted in discovery of three additional mineralizations in the zone, called Avanbekken, the Stangfjellet Sør and Hellerfjelltjønna. Mineralizations at Stangfjellet occur at several levels, of which only two have base metal values above 1 %. The north-easternmost is a c. 1 m thick pyrite impregnated zone of which 10 cm is rich in sphalerite and galena together with pyrite (two analyses show 1.14-1.16 % Zn, 0.06-0.12 % Cu, 0.16-0.33 % Pb and 2-3 g/t Ag). The main pit to the west consists of a c. 1 m thick zone of rich pyrrhotite impregnation with subordinate pyrite and accessory chalcopyrite and sphalerite. The zone is folded with an axis gently dipping westwards. An average of three analysis yielded 0.72 % Zn, 0.42 % Cu, 0.07 % Pb and 6 g/t Ag. Figure

Bibliography:

From NGU's Reference Archive:

Bjerkgård, Terje; Marker, Mogens; Slagstad, Trond; Solli, Arne , 2013

	The Mofjell project: summary and conclusions

;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2013.048;87 pages

Abstract:

The Mofjell project commenced in 2008 as a cooperation between GEXCO Norge AS, the county administration of Nordland and NGU. As GEXCO faced financial difficulties the external funding ended in 2009. The project area included Mofjellet and the eastern part of Plurdalen, an area with a large potential for economic sulfide deposits with Zn, Cu, Pb, Ag and Au. NGU has focused on establishing the geological setting of the Mofjell Group and its relation to ore formation. Another very important goal has been to assess the potential for economic ore deposits in the area, including enrichment of precious metals. On the basis of lithological observations and geochemistry, the Mofjell Group consists of a largely bimodal volcanic-sedimentary assemblage formed in an island-arc to back-arc setting. The data also show that the proportion of felsic volcanic rocks is much higher than previously described. A bimodal volcanic suite mixed with sediments is a geological environment which is regarded as favorable for both rich and large sulfide deposits.

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

Kruse, A. 1987: Undersøkelse av sulfidforekomstene ved Rognhaugbekken, Rana, Nordland. Intern rapport nr. 8607. Prospektering A/S.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	NO0667.03	Bedrock	Sampler :Wilberg, R./...Stored :Løkken Comment :Muskovittgneis med po-cpy-sl-diss. No. of registrated element analyses = 1
	NO0667.04	Bedrock	Sampler :Wilberg, R./...Stored :Løkken Comment :Muskovittgneis med po-cpy-sl-diss. No. of registrated element analyses = 1
	STANGFJELLET-09	Dump	Sampler :T. Bjerkgård/...Stored :Løkken Comment :Disseminated po with lesser py, sl, cpy in quartz-sericite schist No. of registrated element analyses = 1

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

Name of Locality : Skjerp 1

(Object Id : 1833,085,01,00)

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Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.4562240

Latitude:

66.2507650

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

475562 m.

Y-coord:

7347967 m.

Commodity

	Main Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Sub Type:	Zinc
			Element(s):	Kis Zn Cu Pb

Production

	Activity:	Pitting	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:

Information(s) in free text format

Free text

Skjerp 1: 50m mot SV for skjerp 2 er det en ny rustsone (ikke skjerpet). 2 m mektig svovelkis-disseminert muskovittgneis (med litt biotitt). Opptil 10% svovelkis i 10 cm mektig bånd (NO0667.02).

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	NO0667.02	Bedrock	Sampler :Wilberg, R./...Stored :Løkken Comment :Muskovittgneis med py-diss. No. of registrated element analyses = 1

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

Name of Locality : Skjerp 2

(Object Id : 1833,085,02,00)

---

Location

County :

Nordland (18)

Municipality :

Rana (1833)

Map 1:50000:

Storforshei (2027-4)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

14.4571080

Latitude:

66.2510370

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

475602 m.

Y-coord:

7347997 m.

Commodity

	Main Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Sub Type:	Zinc
			Element(s):	Kis Zn Cu Pb

Production

	Activity:	Pitting	Reserves:
	Prod. method:		Production:
	Prod. status:		Volume of dump:

Information(s) in free text format

Free text

Skjerp 2: Det er sprengt ut ca.5 m3 i en skrent i en minst 200 m lang rustsone i småfoldet muskovittgneis (litt biotitt). Hornblendegneis opptrer mot nord i kontakt med den sulfid-disseminerte gneisen. Foliasjonen varierer pga. folding, men er ca.100/80.Foldeakse og lineasjon er 285/30. Det er svak sulfid-disseminasjon over 4-5 m mektighet. Rikere over 1 m mektighet i kontakt med hornblendegneis. Dominerende sulfid er svovelkis (5-10%), men relativt rik på blyglans i et 5 cm bredt bånd (NO0667.01, Stangfjellet-08).

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	NO0667.01	Bedrock	Sampler :Wilberg, R./...Stored :Løkken Comment :Lys glimmergneis med py-ga-diss. No. of registrated element analyses = 1
	STANGFJELLET-08	Bedrock	Sampler :T. Bjerkgård/...Stored :Løkken Comment :Stripes with disseminated py, cpy and sl in qz-sericite schist No. of registrated element analyses = 1

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

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Analyse Results

from

Deposit Area 1833 - 085 Stangfjellet

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#
NO0667.01	Bedrock	1213	11636	1605	25	9	2.5	13.0
NO0667.02	Bedrock	167	1136	184	29	8	.8	16.0
NO0667.03	Bedrock	4958	9354	1361	15	32	9.2	12.0
NO0667.04	Bedrock	2544	11127	397	27	38	3.9	7.0
STANGFJELLET-08	Bedrock	606	11400	3300	19	11	2.0	20.0
STANGFJELLET-09	Dump	5010	1145	228	25	57	4.0	30.0

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Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
NO0667.01	3.0	3.0	2	19.1	54	1.00		2	13
NO0667.02	2.0	1.0	31	3.5	25	1.00		2	2
NO0667.03	1.0	5.0	2	50.4	9	3.00		2	51
NO0667.04	3.0	1.0	2	61.3	14	3.00		2	17
STANGFJELLET-08			20		1515	11.00	-1	-5	5
STANGFJELLET-09			-5		327	8.00	8	-5	7

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Sample No.	S%	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*
NO0667.01	2.60	28	7	370	3.97	1.00	5.00	1	1.0
NO0667.02	4.48	61	6	610	6.14	4.00	6.00	1	4.0
NO0667.03	10.37	1	1	214	16.29	3.00	5.00	6	1.0
NO0667.04	10.90	2	1	278	18.78	3.00	5.00	1	1.0
STANGFJELLET-08			210		4.78	-1.00	-1.00
STANGFJELLET-09			40		15.70	2.00	1.00

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Sample No.	La*	B*
NO0667.01	2.00	2
NO0667.02	25.00	2
NO0667.03	2.00	2
NO0667.04	3.00	2
STANGFJELLET-08
STANGFJELLET-09

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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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