The geology, exploration and characterisation of graphite deposits in the Jennestad area, Vesterålen, northern Norway
This paper reviews graphite exploration in the Jennestad area, Nordland. As a result of helicopter aeromagnetic surveying and subsequent ground geophysics mapping and trenching, some 30, variously sized bodies of graphite schist identified.The graphite-bearing schist occurs associated with dolomite...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2000
|
Subjects: | |
Online Access: | https://hdl.handle.net/11250/2674229 |
id |
ftnorgesgu:oai:openarchive.ngu.no:11250/2674229 |
---|---|
record_format |
openpolar |
spelling |
ftnorgesgu:oai:openarchive.ngu.no:11250/2674229 2024-09-15T18:19:00+00:00 The geology, exploration and characterisation of graphite deposits in the Jennestad area, Vesterålen, northern Norway Gautneb, Håvard Tveten, Einar 12324 Myre 12323 Sortland 2000 application/pdf https://hdl.handle.net/11250/2674229 eng eng NGU Bulletin (436) https://hdl.handle.net/11250/2674229 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no 67-74 GEOLOGISK UNDERSØKELSE GRAFITT OMDANNING Journal article 2000 ftnorgesgu 2024-08-09T03:02:50Z This paper reviews graphite exploration in the Jennestad area, Nordland. As a result of helicopter aeromagnetic surveying and subsequent ground geophysics mapping and trenching, some 30, variously sized bodies of graphite schist identified.The graphite-bearing schist occurs associated with dolomite marbles amphibolites and pyroxene gneisses, all of which are intruded by charnockites and granites. The graphite is coarse, fully ordered, crystalline and flaky. Graded up to 40% carbon were found. Gangue minerals in the ore are quartz, plagioclase, K-feldspar, biotite and orthopyroxene. Some of the largest ore bodies contain about 250,000 tonnes each with an average grade of 20% carbon. Bench-scale benefication tests shown that the ore can be upgraded to a maximum grade of 97% C, with a recovery of 89%. It is believed that the graphite schists were originally sediments rich in organic matter which was converted to graphite during granulite-facies metamorphism. 49529 Article in Journal/Newspaper Myre Nordland Nordland Northern Norway Sortland Vesterålen Nordland NGU Open Archive (Geological Survey of Norway) |
institution |
Open Polar |
collection |
NGU Open Archive (Geological Survey of Norway) |
op_collection_id |
ftnorgesgu |
language |
English |
topic |
GEOLOGISK UNDERSØKELSE GRAFITT OMDANNING |
spellingShingle |
GEOLOGISK UNDERSØKELSE GRAFITT OMDANNING Gautneb, Håvard Tveten, Einar The geology, exploration and characterisation of graphite deposits in the Jennestad area, Vesterålen, northern Norway |
topic_facet |
GEOLOGISK UNDERSØKELSE GRAFITT OMDANNING |
description |
This paper reviews graphite exploration in the Jennestad area, Nordland. As a result of helicopter aeromagnetic surveying and subsequent ground geophysics mapping and trenching, some 30, variously sized bodies of graphite schist identified.The graphite-bearing schist occurs associated with dolomite marbles amphibolites and pyroxene gneisses, all of which are intruded by charnockites and granites. The graphite is coarse, fully ordered, crystalline and flaky. Graded up to 40% carbon were found. Gangue minerals in the ore are quartz, plagioclase, K-feldspar, biotite and orthopyroxene. Some of the largest ore bodies contain about 250,000 tonnes each with an average grade of 20% carbon. Bench-scale benefication tests shown that the ore can be upgraded to a maximum grade of 97% C, with a recovery of 89%. It is believed that the graphite schists were originally sediments rich in organic matter which was converted to graphite during granulite-facies metamorphism. 49529 |
format |
Article in Journal/Newspaper |
author |
Gautneb, Håvard Tveten, Einar |
author_facet |
Gautneb, Håvard Tveten, Einar |
author_sort |
Gautneb, Håvard |
title |
The geology, exploration and characterisation of graphite deposits in the Jennestad area, Vesterålen, northern Norway |
title_short |
The geology, exploration and characterisation of graphite deposits in the Jennestad area, Vesterålen, northern Norway |
title_full |
The geology, exploration and characterisation of graphite deposits in the Jennestad area, Vesterålen, northern Norway |
title_fullStr |
The geology, exploration and characterisation of graphite deposits in the Jennestad area, Vesterålen, northern Norway |
title_full_unstemmed |
The geology, exploration and characterisation of graphite deposits in the Jennestad area, Vesterålen, northern Norway |
title_sort |
geology, exploration and characterisation of graphite deposits in the jennestad area, vesterålen, northern norway |
publishDate |
2000 |
url |
https://hdl.handle.net/11250/2674229 |
op_coverage |
12324 Myre 12323 Sortland |
genre |
Myre Nordland Nordland Northern Norway Sortland Vesterålen Nordland |
genre_facet |
Myre Nordland Nordland Northern Norway Sortland Vesterålen Nordland |
op_source |
67-74 |
op_relation |
NGU Bulletin (436) https://hdl.handle.net/11250/2674229 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no |
_version_ |
1810457097927655424 |