Norsk versjon
THE ORE DATABASE
Occurence 1833 - 004 Langtjern
(Object Id: 2150)
(Last updated: 03.11.1999)
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: 470902 m. North: 7356887 m.
Longitude: 14.3504800 Latitude: 66.3303850
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production: 1,5 thousand tons


Operations
From - To Activity Comments
1965 - 1965 Geophysics
1965 - 1966 Geology
1976 - 1976 Geophysics

Mineralization
Era: Paleozoic Period: Ordovician
Dating: 489 (-6\+6) million year Method: K/Ar
Genesis: Replacement/Metasomatism Form: Irregular
Main texture: Vein network Min. distribution: Irregular (scattered)
Main grain size: Fine grained (< 1 mm) Main alteration: Skarn formation
Strike/Dip: 90 / 70 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Neoproterozoic
Province: Caledonides
Geotec.unit: Rødingsfjell Nappe Complex
Tectonic complex: Øverste allokton
Igneous complex:
Group: Plurdalsgruppen Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Garnet Major mineral (>10%)
Gangue mineral Calcite Major mineral (>10%)
Gangue mineral Pyroxene Major mineral (>10%)
Gangue mineral Amphibole Major mineral (>10%)
Gangue mineral Quartz Subordinate mineral (1-10%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Sphalerite Subordinate mineral (1-10%)
Ore mineral Bornite Accessory mineral (<1%)
Ore mineral Pyrite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Skarn Extrusive
Original rock :Basalt
Metamorphic facies :Amphibolite
Wall rock Glimmerskifer Sedimentary
Original rock :Argillaceous sediment
Metamorphic facies :Amphibolite
Wall rock Kalkspatmarmor Sedimentary
Original rock :Limestone
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Shear plane Strike/Dip :90 / 50 Syn-mineralisation ;...Effect :Controls

Information(s) in free text format
Free text
Dagbrudd (500 m3 tipp), 30 x 3 m og høyde 6 m er drevet langs strøket til skarnhorisonten. Fink. skarn med bånd og linser av kalkspat og kvarts. Ujevn min. av magnetkis og kobberkis + noe sinkblende som impregnasjon og årer i skarn. Stedvis anrikning av malmmin. i kvartslinser (prøve 03). Sidebergarten er kalkspatmarmor med innslag av kalkglimmerskifer.

Bibliography:
From NGU's Reference Archive:
Olerud, Svein , 1979
Stratabunden skarn med koppermineraliseringer i Plurdalen, Rana.
;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.1556/10D;19 pages
Abstract:
Formålet med undersøkelsene var å kartlegge geologisk området Flatlia-Kalseter og å undersøke malmforekomstene i området. En rekke Cu- og Zn-mineraliseringer fins i en hedenbergittskarnbergart som kan følges mer eller mindre sammenhengende fra Kalseter til Båsmoen i Rana. Skarnsonen antas opprinnelig å være et Cu-holdig basisk sediment som ble isokjemisk metasomatisk omvandlet til kalksilikater og senere breksiert og remobilisert. Magnetkis-kopperkis-mineralisering opptrer som nesten massiv breksje-malm eller som impregnasjon i skarnet. Ingen av de undersøkte forekomstene ansees for å være økonomisk interessante, men skarnsonen fra Flatlia mot Båsmoen kan inneholde større skarnkropper med lavprosentlig Cu-impregnasjon.

References not to be found in NGU's Reference Archive.:
Spross, E. 1956: Bericht über die Untersuchungsarbeiten im Sommer 1956. Upubl. rapp.


Rasmussen, F.O. 1984: Reinfjell-Plura området - en del av en dobbel foldet duplex. Upubl.hovedoppg., Inst. for Almen Geologi, Københavns Univ.


Schenk, M. 1987: Skarn formation and mineralization in the Bossmo and Plura area. Unpubl. Diploma in Geology. Swiss Federal Inst. of Technology, Zürich.

Fieldsamples
Sample No. Sample type Miscellanrous
NO0024.03 Bedrock
Sampler: Wilberg, R./...Stored: Løkken
Comment: Skarn.
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: 2972 4,01,00)
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: 471102 m. North: 7356887 m.
Longitude: 14.3549440 Latitude: 66.3304030
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Skjerp 1: Skjerp med 50 m3 tipp. Skjerpet er overgrodd, men fra tippen sees glimmerskifer, skarn og kalkspatmarmor. Impregnasjon av magnetkis og små mengder kobberkis og sinkblende i skarnet (02). Strøk/fall: 90/50.

Name of Locality: Skjerp 2
(Object Id: 2977 4,02,00)
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: 471352 m. North: 7356897 m.
Longitude: 14.3605220 Latitude: 66.3305160
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Skjerp 2: Ca. 40 m lang stoll er drevet mot N (130 m3 tipp). Glimmerskifer veksler med lag av kalkspatmarmor og smale soner av skarn som fører svak impregnasjon av magnetkis og kobberkis + sinkblende. Strøk/fall varierer mye.

Name of Locality: Skjerp 3
(Object Id: 2976 4,03,00)
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: 471432 m. North: 7356947 m.
Longitude: 14.3622960 Latitude: 66.3309720
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Lite overgrodd skjerp. Sulfider ikke sett.

Name of Locality: Skjerp 4
(Object Id: 2973 4,04,00)
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: 471532 m. North: 7356937 m.
Longitude: 14.3645310 Latitude: 66.3308910
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Lite overgrodd skjerp. Sulfider ikke sett.

Name of Locality: Skjerp 5
(Object Id: 2975 4,05,00)
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: 471632 m. North: 7356967 m.
Longitude: 14.3667560 Latitude: 66.3311690
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Skjerp 5: 5 m3 tipp. Båndet, fink. skarn med røde, granatrike striper. Impregnasjon av magnetkis, sinkblende og kobberkis (01). Kalkspatmarmor i hengen.

Fieldsamples
Sample No. Sample type Miscellanrous
NO0024.01 Bedrock
Sampler: Wilberg, R./...Stored: Løkken
Comment: Skarn.
No. of registrated element analyses = 1
NO0024.02 Bedrock
Sampler: Wilberg, R./...Stored: Løkken
Comment: Skarn.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Skjerp 6
(Object Id: 2974 4,06,00)
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: 471782 m. North: 7357017 m.
Longitude: 14.3700940 Latitude: 66.3316320
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Cu Zn
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Information(s) in free text format
Free text
Skjerp 6: Overgrodd skjerp. 10 m3 tipp. Skarn uten sulfider.

Analyse Results
from
Deposit Area 1833 - 004 Langtjern

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#
NO0024.01 Bedrock 1140 23 5 26 6 .8 206.0
NO0024.02 Bedrock 2714 38 8 39 19 1.1 33.0
NO0024.03 Bedrock 2797 21 4 48 10 .8 29.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* S%
NO0024.01 2.0 3.0 15 .3 15 1.00 2 25 1.41
NO0024.02 2.0 4.0 2 .2 4 2.00 2 15 5.99
NO0024.03 1.0 2.0 3 .2 47 1.00 2 12 2.56
------------------
Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*
NO0024.01 1 3 2357 3.67 3.00 6.00 6 141.0 7.00
NO0024.02 1 2 354 10.29 1.00 5.00 3 10.0 2.00
NO0024.03 1 2 1893 5.94 1.00 5.00 16 161.0 2.00
------------------
Sample No. B*
NO0024.01 2
NO0024.02 2
NO0024.03 2

The fact sheet was created on 05.05.2024
Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
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