Fact Sheet for <b>Occurence 4212

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Occurence 4212 - 305 Lia
	(Object Id: 8348) (Last updated: 21.10.2014)

Location

County:

Agder

Municipality:

Vegårshei (4212)

Map 1:50000:

Gjerstad (1612-1)

Map 1:250000:

Arendal

Coordinate system:

EU89-UTM Zone 32

East:

499036 m.

North:

6517971 m.

Longitude:

8.9833250

Latitude:

58.8017030

Show on map

Resource

Resource Type:

Graphite

Resource Subtype:

Graphite

Importance

Raw material meaning:

Little Importance (reg. 21.10.2014)

Historical:

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

Resources and production

	Activity:	Mining	Reserves:
	Operating method:	Open pit and underground mining	Historical production:

Operations

From - To Activity Comments

1650 Regular production Company/Institution :Engledalske Isen fabrik

Mineralization

Era: Proterozoic Period:

Genesis: Sedimentary deposit Form: Lens

Main texture: Granoblastic Min. distribution: Massive (>50 % 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%)

Structures

Location: Type: Orientation(360 gr.): Relation to min.:

Host rock Foliation Strike/Dip :68 / 66 Post-mineralisation ;...Effect :Controls

Information(s) in free text format

Free text

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.

Photo(s) from the Deposit area:

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

Comment: 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.:

Analyse Results

from

Deposit Area 4212 - 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%

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

Era:	Proterozoic	Period:
Genesis:	Sedimentary deposit	Form:	Lens
Main texture:	Granoblastic	Min. distribution:	Massive (>50 % ore minerals)

	Province:
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

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

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