Fact Sheet for <b>Occurence 3118

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Occurence 3118 - 304 Olberg
	(Object Id: 8891) (Last updated: 20.02.2006)

Location

County:

Østfold

Municipality:

Indre Østfold (3118)

Map 1:50000:

Askim (1914-2)

Map 1:250000:

Oslo

Coordinate system:

EU89-UTM Zone 32

East:

629518 m.

North:

6618892 m.

Longitude:

11.3007140

Latitude:

59.6878330

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Resource

Resource Type:

Mica minerals

Resource Subtype:

Pegmatitic muscovite

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

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

Operations

From - To Activity Comments

1890 - 1900 Regular production

Mineralization

Genesis: Form:

Main texture: Min. distribution:

Main grain size:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Information(s) in free text format

Free text

Forekomsten oppgis å ligge i utmark til plassen Haltberg ca. 300 m sør for Olberg. Forekomsten var i 1932 et vannfylt hull på 12x 1.5 m. Driften har vært gjort hovedsaklig på glimmer. Broch oppgir at forekomsten er gjengrodd og vanskelig å beskrive. Driften pågikk i 1890-årene og nedlagt omkring 1900 da forekomsten var utdrevet.

Bibliography:

From NGU's Reference Archive:

Broch, Olaf Anton , 1934

Feltspat IV. Forekomster i Akershus og Østfold øst for Glomma.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.141;1-119 pages

Abstract:

In this publication, which is a sequel to Feltspat II and III by Olaf Andersen and Tom F.W. Barth, brief and exoteric descriptions and some information on production and history are given of about 180 individual feldspar, quartz, and mica deposits, all of them situated east of the river Glomma in south-eastern Norway. Particulars of purely geological or mineralogical interest are few; most of them are given as footnotes or in the preface, but the minerals of each deposit, exceot quartz, feldspar and mica, are listed. The deposits are cross cutting pegmatite dikes, with a northeastern strike and a steep dip. The dikes exhibit a marked zoning; moreover, they are remarkably free from rare minerals, the occurrences of which seems to be restricted almost entirely to the dikes near the Idefjord (Bohus) granite.

	From - To	Activity	Comments
	1890 - 1900	Regular production

	Genesis:		Form:
	Main texture:		Min. distribution:

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