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|
Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit Area 1833 - 123 | |||||
| (Last updated 06.feb.2017) | |||||
Name of Deposit Area : Hellerfjelltjønn |
| (Object Id : 1833,123,00,00) |
| The deposit area belongs to the Province : Mofjellet sink-bly |
| Location |
| County : | Nordland (18) | Municipality : | Rana (1833) |
| Map 1:50000: | Store Akersvandet (2027-3) | Map 1:250000: | Mo i Rana |
| Marking point: | Longitude: | 14.5002470 | Latitude: | 66.2136040 |
| EU89-UTM Zone 33 | (Coordinates IS confirmed) |
| X-coord: | 477507 m. | Y-coord: | 7343809 m. |
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| Commodity |
| Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Zinc | |
| Element(s): | Zn Pb |
| Production |
| Activity: | Exploration | Reserves: | ||
| Prod. method: | Production: | |||
| Prod. status: | Volume of dump: |
| Importance |
| Public: | Not Assessed (reg. 20.03.2017) |
| Economical: | Not classified/evaluated |
Operations |
| From - To | Activity | Comments | |
| 2007 - 2007 | Geophysics | Company/Institution :GEXCO Norge AS | |
| TEM magnetometry | |||
| 2008 - 2009 | Geology | Company/Institution :NGU | |
| 2009 - 2009 | Sampling | Company/Institution :NGU |
Mineralization |
| Era: | Proterozoic | Period: | Neoproterozoic | |
| Dating: | Method: | |||
| Genesis: | Volcex | Form: | Layer | |
| Main texture: | Banded | Min. distribution: | Irregular (scattered) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: | Sericitisation |
| 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 | Quartz | Major mineral (>10%) | |
| Gangue mineral | Muscovite | Major mineral (>10%) | |
| Ore mineral | Pyrite | Major mineral (>10%) | |
| Ore mineral | Sphalerite | Subordinate mineral (1-10%) | |
| Ore mineral | Galena | Subordinate mineral (1-10%) | |
| Ore mineral | Chalcopyrite | Accessory mineral (<1%) |
Lithology: |
| Relationship | Rock | Origin | |
| Host rock | Muscovite gneiss | Extrusive | |
| Metamorphic facies :Amphibolite |
Information(s) in free text format |
| Free text |
| Det er en mineralisert sone oppe i en bratt åsside på nordsiden av Hellerfjelltjønna. Mineraliseringen ligger innenfor en langstrakt sone av sulfid-impregnerte muskovittgneisser som strekker seg fra Stangfjellet i nord til Hellerfjellet i sør, mer enn 20 km langs strøket. Det har tidligere vært gjort undersøkelser på tre lokaliteter innen denne sonen: Stangfjellet, Rognhaugbekken og Hellerfjellet. Kartleggingen i 2008-2009 resulterte i funn av ytterligere tre mineraliseringer: Avanbekken, Hellerfjelltjønna og Stangfjellet Sør. Det er rasfarlig oppe i den stupbratte skrenten/åsen og det er derfor vanskelig å se hvor mektig sonen er. Det er rast ut en rekke blokker bestående av kvarts-sericittskifer med svak pyrittimpregnasjon og noe sinkblende og blyglans i den østlige delen. Bærbar XRF viste opptil 1.50 % Zn og 5.68 % Pb. Det ble tatt en prøve til lab-analyse og denne gav 0.28 % Zn og 0.14 % Pb. Lengst i vest kommer en opp til sonen og der er den minst 10 meter mektig. Her ble det imidlertid ikke funnet sink eller bly med bærbar XRF. Sonen har en utstrekning på mer enn 300 meter langs strøket. |
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-07 | Bedrock |
|
| NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
| from |
| Deposit Area 1833 - 123 Hellerfjelltjønn |
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# |
| STANGFJELLET-07 | Bedrock | 476 | 2820 | 1420 | 1 | -5 | 1.0 | 20.0 |
| ------------------ |
| Sample No. | As* | Ba* | Mo* | Sn* | Sb* | Bi* | Cr* | Fe% | Th* |
| STANGFJELLET-07 | -5 | 616 | 3.00 | 1 | -5 | -2 | -10 | 1.75 | 8.00 |
| ------------------ |
| Sample No. | U* | ||||||||
| STANGFJELLET-07 | 2.00 |
| The fact sheet was created on 22.11.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |