Fact Sheet for Deposit Area 815

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit Area 815 - 305
	(Last updated 01.feb.2008)

Name of Deposit Area : Brentholmen

(Object Id : 0815,305,00,00)

Location

County :

Telemark (08)

Municipality :

Kragerø (0815)

Map 1:50000:

Kragerø (1712-4)

Map 1:250000:

Arendal

Marking point:

Longitude:

9.5116490

Latitude:

58.8538610

EU89-UTM Zone 32

(Coordinates NOT confirmed)

X-coord:

529519 m.

Y-coord:

6523892 m.

Commodity

Main Type:

Feldspar

Sub Type:

Pegmatitic feldspar

Production

Activity:	Test mining	Reserves:
Prod. method:	Open pit mining	Production:
Prod. status:	Disused, closed	Volume of dump:

Importance

Public: Not Assessed (reg. 18.02.2015)

Economical: Not classified/evaluated

Mineralization

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Stratigraphic classification of host rock

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Information(s) in free text format

Free text

På Brentholmen har det ikke vært noen regelmessig drift, men endel kvartsholdig feltspat og kvarts er tatt ut fra et lite forsøksbrudd på sørsiden av øya. Pegmatitten som er 300 m lang og vel 100 m på det bredeste består av en finkornet blanding av feltspat og kvart, for en del i form av skriftgranitt med kali-natronfeltspat. Tildels store partier av kvarts. Ref.: O. Andersen

Bibliography:

From NGU's Reference Archive:

Andersen, Olaf , 1931

Feltspat II. Forekomster i fylkene Buskerud og Telemark, i flere herreder i Aust-Agder og i Hidra i Vest-Agder.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.128B;1-109 pages

Abstract:

Summary s. 151. Feldspar deposits in Southern Norway. (Feltspat II by Olaf Andersen and Feltspat III by Tom F.W. Barth) A few years ago one of the writers published a general outline of the properties, mode of occurrence, exploitation and uses of feldspar with special reference to the Norwegian feldspar industry (Olaf Anderesn, Feltspat I, Norges geologiske undersøkelse, Nr. 128A, 1926). To that publication the reader is referred for general in- formation regarding the feldspar industry of Norway. In the present publi- cation brief descriptions are given of 262 individual feldspar deoposits, all situated in the part of Southern Norway that extends, generally in a rather narrow zone, along the coast westward from the neighbourhood of Kragerø to the island Hidra near Flekkefjord. The deposita described lie in the counties Buskerud, Telemark, Aust-Agder and Vest-Agder, and are distributed over a large number of local districts (herreder). The most important districts at present are those in the neighbourhood of Kragerø ((Bamble, Skåtøy and Sannidal), those along the coast between Risør and Arendal (especially Søndeled, Holt and Froland), and the two districts north of Kristiansand (Iveland and Evje). Each description contains information about the dimensions and general attitude of the pagmatite body and the feldspar.

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