English version
	INDUSTRIMINERALDATABASEN
	Forekomstområde 912 - 305
	(Sist oppdatert 21.okt.2014)

Betydning

Offentlig:

Little Importance (reg. 21.10.2014)

Economical:

Lite viktig , (Confirmed 20.feb.2006 by Havard Gautneb)

Historical:

Yes , (Confirmed 20.feb.2006 by Havard Gautneb)

Operations

	From - To	Activity	Comments
	1650	Regular production	Company/Institution :Engledalske Isen fabrik

Mineralization

	Era:	Proterozoic	Period:
	Dating:		Method:
	Genesis:	Sedimentær avsetning	Form:	Linse
	Main texture:	Granoblastisk	Min. distribution:	Massiv

Main grain size:

Middelskornet (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

	Relationship	Mineral	Amount
	Not defined	Graphite	Major mineral (>10%)

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Foliation	Strike/Dip :68 / 66	Post-mineralisation ;...Effect :Controls

Opplysning(er) i fritekstformat

Fri tekst

Forekomsten ligger på Kortmyrknotten NØ for Bjørnåsvatnet. Den utgjør 3 mindre vannfylte synk som har vært drevet på en 1-3m mektig grafittmalm. Malmen er kompakt, massiv og grovflakig og er drevet over en lengde på 40m. Sidebergarten er en granittisk gneis som er gjennomsatt av yngre granittiske bergarter. På tipphaugen finnes en rekke malmprøver av god kvalitet. Dette er den eneste av grafittforekomstene i området som sikkert lar seg påvise. Dette var nok også hovedforekomsten for det Engeldalske Isen verk.

Bilde(r) fra forekomstområdet:

Photo no. 1 showing Tipphaugen ved Lia grafitt forekomst" Photo no. 2 showing Vannfylt synk med utgående grafittskifer i bakkant" Photo no. 3 showing Tipphaugen ved Lia grafitt forekomst" Photo no. 4 showing Vannfylt synk med utgående grafittskifer i bakkant"

Bibliography:

From NGU's Reference Archive:

Touret, Jacques , 1968

	The precambrian metamorphic rocks around the lake Vegår (Aust-Agder, southern Norway).

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.257;1-45 + ka pages

Abstract:

An area about 2000 km between the Skagerak coast (Tvedestrand - Risør) and the Southern part of the Telemark province (Tjønefoss - Neslandvatn) has been investigated and is considered to be a genetically homogenous migmatitic complex. The evolution of the rocks is supposed to represent an orogenic development in which 3 fundamental phases have been recognized: 1) Deposition of geosynclinal supracrustals (mainly detrital or peltic sediments and basic intrusions). 2) Widespread migmarization as a consequence of deformation and intermediate pressure regional metamorphism (Caledonian type). The grade of metamorphism is essentially controlled by theavailable amount of water as a free gazeous phase and decreases regularly from the Skagerak coast (hornblende granulite subfacies) towards the Telemark (low ampholite facies). 3) Local retrograde metamorphism in elongated zones which have remained mobile well after the end regional migmatization. In connection with this late diapthoresis important movements brought in contact areas at different stages of migmatitic evolution, particularly the catazonal and deep catazonal Bamble and the mesozonal Telemark domains.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	hg2-13	Dump	Sampler :Håvard Gautneb Kommentar :Sample of graphite schist taken from the spoil heap No. of registrated special analyses = 2

NB! All analyse values are shown at the end of the printout.:

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Analyse Results

from

Forekomstområde 912 - 305 Lia

Special analyses

Sample No.	Sample Type	What is measured	Result
hg2-13	Dump	Content of sulfur	.38%
hg2-13	Dump	Total carbon (TC)	16.3%

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Faktaarket ble generert 13.06.2026

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

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