Norsk versjon
THE ORE DATABASE
Occurence 1825 - 015 Jamtfjellet
(Object Id: 2841)
(Last updated: 26.06.2001)

Location
County: Nordland Municipality: Grane (1825)
Map 1:50000: Trofors (1926-3) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 434142 m. North: 7287198 m.
Longitude: 13.5657070 Latitude: 65.6997760
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au As Pb Cu
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Operations
From - To Activity Comments
1981 - 1984 Geochemistry Company/Institution :BP Norge A/S Minerals
1983 - 1984 Sampling Company/Institution :BP Norge A/S Minerals
1984 - 1984 Geology Company/Institution :BP Norge A/S Minerals
1989 - 1992 Sampling Company/Institution :NGU/Orkla

Mineralization
Era: Paleozoic Period: Devonian
Genesis: Hydrothermal vein Form: Plate
Main texture: Fracture filling Min. distribution: Disseminated (<20 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration: Sericitisation
Strike/Dip: 81 / 90 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Neoproterozoic
Province: Caledonides
Geotec.unit: Helgeland Nappe Complex
Tectonic complex:
Igneous complex:
Group: Geittind Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Sericite Subordinate mineral (1-10%)
Ore mineral Arsenopyrite Major mineral (>10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Galena Subordinate mineral (1-10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Gold Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Glimmergneis Sedimentary
Original rock :Silty mudstone
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Foliation Strike/Dip :230 / 70 Pre-mineralisation ;...Effect :None
Host rock Shear plane Strike/Dip :290 / 65 Syn-mineralisation ;...Effect :Controls

Information(s) in free text format
Free text
Mineraliseringen ble påvist i 1983 av BP Norge A/S Minerals ved oppfølging av bekkesedimentanomalier i forbindelse med regionale gullundersøkelser i Helgeland (samarbeid med Norsk Hydro). Hovedforekomsten opptrer langs en kløft på ryggen av Jamtfjellet. Den ble undersøkt med kjerneboring i 1984. 5 hull med total lengde på 379 m ble boret. Berggrunnen i området består av biotittgneiser med innhold av granat og utvikling av leukosom-årer. De gjennomsettes av tynne granittganger som ofte er sterkt migmatittiske. Gneisen fører tynne soner av amfibolitt, kvartsitt og marmor, likeledes "en echelon"-systemer av kvartslinser (0,1-1,0 m brede og opptil 40 m lange. Aksen til gangsystemene varierer mellom N120°Ø og N130°Ø. Gull-arsenkismineralisering finnes langs kontakten av enkelte kvartslinser i tre av disse gangsystemene, hvor linsene er fragmentert i forbindelse med senere skjærdeformasjon. I den østlige og vestlige del av hovedforekomsten er ganglinsene dels utviklet som kvartsbreksjer som i de mineraliserte partier viser serisitt- og kloritt-omvandling av breksjefragmenter og omkringliggende biotittgneiser. Mineraliseringen består hovedsaklig av fin- til middelskornet arsenkis og svovelkis samt stedvis blyglans og kobberkis. Sulfidene danner disseminerte striper og sprekkefyllinger i kvartsen langs gneiskontakten og dels disseminasjon i de omvandlete gneisene langs gangkontakten og i fragmentene. Hovedforekomstens ganglinser har strøk/fall 78/55 (vestlinse), 81/80 (sentrallinse) og 81/75 - 105/68 (østlinsene). I det Søndre gangsystem har linsene str./fall mellom 290°-320°/65°-75°. Mineraløiseringen tilsvarer den i hovedforekomsten, men er mye svakere og fører kun sidesteinsomvandling.

Bibliography:
From NGU's Reference Archive:
Gustavson, Magne , 1988
Mosjøen. Berggrunnsgeologisk kart M 1 : 250 000. Beskrivelse.
;Norges geologiske undersøkelse;KARTBESKRIVELSE; BOK;Skrifter; No.87;1 - 42 pages
Abstract:
The principal geological and tectonostratigraphic divisions of the bedrock within the area of mapsheet Mosjøen are: (1) Precambrian basement rocks with minor occurrences of possible Cambrian cover sediments, (2) the Susendalen Nappe, (3) the Seve-Køli Nappe Complex, (4) the Rødingsfjell Nappe, and (5) the Helgeland Nappe Complex. Short accounts of economic geology (ores and industrial minerals) are given.

Fieldsamples
Sample No. Sample type Miscellanrous
39/9089835 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089836 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089837 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089838 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken

Name of Locality: Østlinsene
(Object Id: 3571 15,01,00)

Location
County: Nordland Municipality: Grane (1825)
Map 1:50000: Trofors (1926-3) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 434292 m. North: 7287128 m.
Longitude: 13.5690070 Latitude: 65.6991790
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au As Pb Cu
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
39/9089839 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089840 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken

Name of Locality: Sentrallinsen
(Object Id: 3572 15,02,00)

Location
County: Nordland Municipality: Grane (1825)
Map 1:50000: Trofors (1926-3) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 434202 m. North: 7287158 m.
Longitude: 13.5670330 Latitude: 65.6994290
Show on map

Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au As Pb Cu
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
39/9089841 Dump
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089842 Dump
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089843 Dump
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089844 Dump
Sampler: Ihlen, P.M./...Stored: Løkken

Name of Locality: Nordre gangsystem
(Object Id: 3573 15,03,00)

Location
County: Nordland Municipality: Grane (1825)
Map 1:50000: Trofors (1926-3) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 434222 m. North: 7287288 m.
Longitude: 13.5674040 Latitude: 65.7005990
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au As Pb Cu
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Name of Locality: Søndre gangsystem
(Object Id: 3577 15,04,00)

Location
County: Nordland Municipality: Grane (1825)
Map 1:50000: Trofors (1926-3) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 433892 m. North: 7286858 m.
Longitude: 13.5604340 Latitude: 65.6966750
Show on map

Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au As Pb Cu
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
39/9089832 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089833 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken
39/9089834 Bedrock
Sampler: Ihlen, P.M./...Stored: Løkken

Name of Locality: Borhull
(Object Id: 3576 15,05,00)

Location
County: Nordland Municipality: Grane (1825)
Map 1:50000: Trofors (1926-3) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 434122 m. North: 7287188 m.
Longitude: 13.5652770 Latitude: 65.6996820
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au As Pb Cu
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Name of Locality: Borhull
(Object Id: 3575 15,06,00)

Location
County: Nordland Municipality: Grane (1825)
Map 1:50000: Trofors (1926-3) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 434012 m. North: 7287308 m.
Longitude: 13.5628220 Latitude: 65.7007360
Show on map

Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au As Pb Cu
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Name of Locality: Borhull
(Object Id: 3574 15,07,00)

Location
County: Nordland Municipality: Grane (1825)
Map 1:50000: Trofors (1926-3) Map 1:250000: Mosjøen
Coordinate system: EU89-UTM Zone 33
East: 434312 m. North: 7287098 m.
Longitude: 13.5694570 Latitude: 65.6989140
Show on map

Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au As Pb Cu
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


The fact sheet was created on 28.03.2024

Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
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