Norsk versjon
THE ORE DATABASE
Occurence 1833 - 085 Stangfjellet
(Object Id: 2786)
(Last updated: 06.02.2017)
Belongs to the Province: Mofjellet sink-bly
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 475132 m. North: 7347997 m.
Longitude: 14.4466510 Latitude: 66.2510000
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Kis Zn Cu Pb
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Pitting Reserves:
Operating method: Historical production: ,01 thousand tons


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

Mineralization
Era: Proterozoic Period: Neoproterozoic
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: 3442 85,01,00)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 475562 m. North: 7347967 m.
Longitude: 14.4562240 Latitude: 66.2507650
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Kis Zn Cu Pb
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


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: 3443 85,02,00)
Location
County: Nordland Municipality: Rana (1833)
Map 1:50000: Storforshei (2027-4) Map 1:250000: Mo i Rana
Coordinate system: EU89-UTM Zone 33
East: 475602 m. North: 7347997 m.
Longitude: 14.4571080 Latitude: 66.2510370
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Kis Zn Cu Pb
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


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.:

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

The fact sheet was created on 03.05.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
Copyright © 2024 Geological Survey of Norway