English version
	INDUSTRIMINERALDATABASEN
	Registrering 1867 - 303 Kråkberget
	(Objekt Id: 7630) (Sist oppdatert: 31.08.2022)

Produkt

	Element/produkt	Gehalt/Kvalitet	Reg. dato
	Ildfastmateriale	20 %	26.11.1993

Operasjoner

	Fra - Til	Aktivitet	Kommentar
	1900 - 1914	Regulær drift	Selskap/Institusjon:Anglo-Norgwegian Mining

Mineralisering

	Æra:	Proterozoikum	Periode:
	Genese:	Sedimentær avsetning	Form:	Lag
	Hovedtekstur:	Granoblastisk	Min. fordeling:	Disseminert

Kornstørrelse:

Middelskornet (1-3 mm)

	Strøk/Fall:		Retning:
			Feltstupning:

Stratigrafisk klassifikasjon av vertsbergart

Æra:

Proterozoikum

Periode:

	Provins:
	Geotek.enhet:
	Tektonisk complex:
	Intrusivt komplex:

Gruppe:

Formasjon:

Mineralogi

	Mineral	Mengde
	Grafitt	Hovedmineral (>10%)
	Plagioklas	Hovedmineral (>10%)
	Kvarts	Hovedmineral (>10%)
	Biotitt	Hovedmineral (>10%)
	Muskovitt	Hovedmineral (>10%)

Opplysning(er) i fritekstformat

Fri tekst

Forekomsten ligger innerst i bukta like øst for Kråbergneset. Gruva er 20 m lang og 5-10m bred. Det var tidligere synlig et vannfylt synk, dette er i dag igjenfyll og det er ikke synlig noen spor av forekomsten. Det er i dag 2012 ikke mulig å prøve ta forekomsten. Undersøkelser med EM 31 i 2012 antyder at malmen kan følgens noen 50-60 meter mot sør i flere paralelle soner.

Litteraturfortegnelser:

Fra NGU's Referansearkiv.:

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 sider

Abstrakt:

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 sider

Abstrakt:

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.

Feltprøver

	Prøvenr.	Prøvetype	Diverse
	NO0331.01I	Tipprøve	Prøvetaker: Gautneb, H. Kommentar: Grafittmalm fra tippen, ganske grovflakig grafitt med noe karboant
	NO0331.02I	Tipprøve	Prøvetaker: Gautneb, H. Kommentar: Grafittmalm fra tippen, grovflakig grafitt
	NO0331.03I	Tipprøve	Prøvetaker: Gautneb, H. Kommentar: Tipprøve av grafittmalm, ganske grovflakig

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Faktaarket ble generert 27.04.2024

Spørsmål eller kommentarer vedrørende faktaarket kan mailes til: ressursdatabaser@ngu.no

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