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	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 07.02.2017)

Operations

	From - To	Activity	Comments
	2007 - 2007	Geophysics	Company/Institution :GEXCO Norge AS
	2008 - 2009	Geology	Company/Institution :NGU
	2009 - 2009	Detail mapping	Company/Institution :NGU
	2009 - 2009	Sampling	Company/Institution :NGU

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Genesis:	Volcex	Form:	Lens
	Main texture:	Banded	Min. distribution:	Irregular (scattered)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Neoproterozoic

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

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Celsian	Major mineral (>10%)
	Gangue mineral	Quartz	Major mineral (>10%)
	Ore mineral	Sphalerite	Major mineral (>10%)
	Ore mineral	Galena	Major mineral (>10%)
	Ore mineral	Pyrite	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Accessory mineral (<1%)
	Ore mineral	Molybdenite	Accessory mineral (<1%)
	Ore mineral	Pyrrhotite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Muscovite gneiss	Extrusive
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Fold axis	Dir./Plunge :126 / 30	Post-mineralisation ;...Effect :Modifies

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 this project has resulted in discovery of three additional mineralizations in the zone, called Avanbekken, Hellerfjelltjønna and Stangfjellet Sør. The Stangfjellet Sør deposit is situated on the easternmost part of Stangfjellet and is a lens of barium-rich mineralization, c. 65-70 m long and up to 3 m thick in the central parts.The mineralization is banded on cm- to dm scale with alternating quartz-rich and barium-rich bands. There are also lenses and schlieren enriched in graphite, especially in the eastern part of the deposit. Associated with the most barium-rich bands are mm-sized grains of sphalerite and galena, especially in the western half of the deposit. Analyses with portable XRF show values up to 1.68 % Zn, 1.21 % Pb, 0.10 % Cu and 18.3 % Ba. The barium content is generally higher than 1.5 % and the average of 34 analyses is 4.5 % Ba. The average of total base metals is below 0.5 % in the best part of the deposit. Three bedrock samples analyzed by the NGU laboratory confirm the analytical data from the field, and show in addition some enrichment of Ag and Mo. The barium-bearing mineral in the deposit is the barium feldspar celsian (BaAl2Si2O8), generally with less than 10 % of albite or/and orthoclase component. Except for celsian, quartz is the only other important silicate in the matrix. Sulfides, mainly sphalerite and galena, occur in scattered small grains.

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.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	STANGFJELLET-04	Bedrock	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Banded quartz-celsian with scattered sphalerite and galena No. of registrated element analyses = 1
	STANGFJELLET-05	Bedrock	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Banded quartz-celsian with scattered sphalerite and galena No. of registrated element analyses = 1
	STANGFJELLET-06	Bedrock	Sampler: T. Bjerkgård/...Stored: Løkken Comment: Graphitic celsian-quartz No. of registrated element analyses = 1

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

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The fact sheet was created on 02.05.2024

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