(Last updated: 31.08.2022)
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Norsk versjon | ||||
| THE INDUSTRIAL MINERAL DATABASE | |||||
| Occurence 1867 - 303 Kråkberget | |||||
| (Object Id: 7630) (Last updated: 31.08.2022) |
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| Location |
| County: | Nordland | Municipality: | Bø (1867) |
| Map 1:50000: | Nykvåg (1132-1) | Map 1:250000: | Svolvær |
| Coordinate system: | EU89-UTM Zone 33 |
| East: | 488015 m. | North: | 7627880 m. |
| Longitude: | 14.7035430 | Latitude: | 68.7622410 |
| Show on map |
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| Resource |
| Resource Type: | Graphite | Resource Subtype: | Graphite |
| Importance |
| Raw material meaning: | Little Importance (reg. 18.02.2015) |
| Resources and production |
| Activity: | Mining | Reserves: | ||
| Operating method: | Underground mining | Historical production: |
Products |
| Element/product | Crude ore grade or quality | Reg. date | |
| Refractories | 20 % | 26.11.1993 |
Operations |
| From - To | Activity | Comments | |
| 1900 - 1914 | Regular production | Company/Institution :Anglo-Norgwegian Mining |
Mineralization |
| Era: | Proterozoic | Period: | ||
| Genesis: | Sedimentary deposit | Form: | Layer | |
| Main texture: | Granoblastic | Min. distribution: | Disseminated (<20 % ore minerals) |
| Main grain size: | Medium grained (1-3 mm) |
| Strike/Dip: | Direction: | |||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Proterozoic | Period: |
| Province: | ||
| Geotec.unit: | ||
| Tectonic complex: | ||
| Igneous complex: |
| Group: | Formation: |
Mineralogy |
| Mineral | Amount | |
| Graphite | Major mineral (>10%) | |
| Plagioclase | Major mineral (>10%) | |
| Quartz | Major mineral (>10%) | |
| Biotite | Major mineral (>10%) | |
| Muscovite | Major mineral (>10%) |
Information(s) in free text format |
| Free text |
| The deposit is today not visible, the a water filled sink hole that was visible earlier is today (2012) filled with rocks from the spoil heap and nothing is visible of the deposit. Rønning et al (2019) reports that the Kråkberget deposit is a direct continuation (under soil cover) of the better investigated Sommarland deposit, which is situated abour 300 m to the south. |
Bibliography: |
| From NGU's Reference Archive: |
| Rønning, J.S.; Gautneb, H.; Larsen, B.E.; Knezevic, J.; Baranwal, V.C.; Elvebakk, H.; Gellein, J.; Ofstad, F.; Brönner, M. , 2018 |
| Geophysical and geological investigations of graphite occurrences in Vesterålen and Lofoten, Northern Norway 2017 |
| ;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2018.011;180 pages |
| Abstract: | |
| As a part of the MINN project (Minerals in Northern Norway), a helicopter-borne geophysical survey was performed in Lofoten and Vesterålen in 2013. Electromagnetic data from this survey showed up anomalies that may be caused by large graphite mineralisation. With financial support from Nordland County, NGU has performed geophysical and geological follow-up work to 1) confirm the existence of graphite and 2) Briefly evaluate the quantity and quality of graphite structures. The project started in 2015 and the results from the first two years are reported by Gautneb et al. (2017) and Rønning et al. (2017). Follow-up work performed in 2017 is reported in this report. 15 locations have been investigated in total in 2017. The degree of detail in these studies varies from just a few lines of simple electromagnetic measurements (EM31) to electric measurements such as Self Potential (SP), Charged Potential (CP) and Electric Resistivity Traversing (ERT) in combination with Induced Polarisation (IP). In two areas, Sommarland and Haugsnes in Bø municipality, two short core drilling bore holes were made. The selection of follow-up objects was based on both magnetic and electromagnetic data from helicopter-borne measurements. All results from the 2017 work are reported here. Where possible, the volume of graphite is estimated based on the total strike length, the width of individual zones (from drilling, observations and width of EM31 measurements) and an assumed depth extent of 100 m. In these areas, an estimation of graphite tonnage is also given. |
| Rønning, J.S.;Gautneb, H.; Larsen, B.E.; Baranwal, V.C.; Davidsen, B.; Engvik, A.K.; Gellein, J.; Knezevic, J.; Ofstad, F.; Xiuyan Ren; Viken, G. , 2019 |
| Geophysical and geological investigations of graphite occurrences in Vesterålen, Northern Norway, in 2018 and 2019 |
| ;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2019.031;212 pages |
| Abstract: | |
| Several potential graphite occurrences in Vesterålen were selected for follow-up work based on helicopter-borne geophysical data. The purpose for this is to confirm the existence of the graphite and next to briefly evaluate the quality and quantity of the graphite-bearing structures. The goal for the project, which is sponsored by Nordland county administration, is to increase the knowledge of each individual graphite occurrence. By doing so, the interest in graphite prospecting in Northern Norway may increase, effective prospecting can be implemented, and land planning can be developed with appropriate regard for areas with potential for economic graphite. |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | |||
| NO0331.01I | Dump |
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| NO0331.02I | Dump |
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| NO0331.03I | Dump |
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| The fact sheet was created on 27.04.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |