Norsk versjon | |||||
THE ORE DATABASE | |||||
Occurence 1825 - 015 Jamtfjellet | |||||
(Object Id: 2841) (Last updated: 26.06.2001) |
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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 |
Show on map |
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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 |
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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 |
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39/9089836 | Bedrock |
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39/9089837 | Bedrock |
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39/9089838 | Bedrock |
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Name of Locality: Østlinsene |
(Object Id: 3571 15,01,00) |
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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 |
Show on map |
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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 |
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39/9089840 | Bedrock |
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Name of Locality: Sentrallinsen |
(Object Id: 3572 15,02,00) |
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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 |
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39/9089842 | Dump |
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39/9089843 | Dump |
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39/9089844 | Dump |
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Name of Locality: Nordre gangsystem |
(Object Id: 3573 15,03,00) |
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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 |
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: Søndre gangsystem |
(Object Id: 3577 15,04,00) |
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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 |
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39/9089833 | Bedrock |
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39/9089834 | Bedrock |
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Name of Locality: Borhull |
(Object Id: 3576 15,05,00) |
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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 |
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: 3575 15,06,00) |
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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) |
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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 |
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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: |
The fact sheet was created on 28.03.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
Copyright © 2024 Geological Survey of Norway |