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	MALMDATABASEN
	Forekomstområde 123 - 002
	(Sist oppdatert 22.okt.2025)

Betydning

Offentlig:

Liten betydning (reg. 18.02.2015)

Økonomisk:

Lite viktig , (Stadfestet 16.feb.2005 av Havard Gautneb)

Mineralisering

	Æra:	Proterozoikum	Periode:	Mesoproterosoikum
	Datering:		Metode:
	Genese:	Ortomagmatisk	Form:
	Hovedtextur:		Min. fordeling:

Kornstørrelse:

Hovedomvandling:

	Strøk/Fall:		Retning:
			Feltstupning:

Stratigrafisk klassifikasjon av vertsbergart

Æra:

Proterozoikum

Periode:

Mesoproterosoikum

	Provins:	Østnorske grunnfjellsprovins
	Geotek.enhet:	Østfoldkomplekset
	Tektonisk complex:
	Intrusivt komplex:

Gruppe:

Formasjon:

Opplysning(er) i fritekstformat

Fri tekst

Skjerpet er gjenfylt av tidligere grunneier og området er nå (2025) parkeringsplass for diverse kjøretøy. Skov Andersen (1972) beskriver en vannfylt synk på ca. 3 x 3 m i en amfibolitt med svært begrenset utstrekning (10-15 m). Middelskornet metagabbro finnes i en liten knaus rett sør for parkeringsplassen og i øst er det båndet gneis med amfibolittiske bånd i cm-skala. En mindre blokk med disseminert magnetkis og kobberkis ble prøvetatt. Ifølge Rekstad (1921) opptrer mineraliseringene i fahlbånd i gneis og ble drevet av Romsås nikkelverk fram til 1877.

Litteraturfortegnelser:

Fra NGU's Referansearkiv.:

, 1940

	Aktenvermerk uber Nickelerz-Vorkommen in Smålenene.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1585;2 sider

	Abstrakt:
	Notatet gir opplysninger om nikkel-magnetkisforekomster i Smålenene, Spydeberg, Hobøl, Skiptvedt, Svendal, Rakkestad, Eidsberg, Trøgstad og Askim.

Foslie, Steinar , 1925

	Syd-Norges gruber og malmforekomster.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.126;1-89 + ka sider

Abstrakt:

On the map accompanying this paper all the mines and ore deposits of Southern Norway are collected for the first time.The material has been gathered from printed and unprinted sources, communications from mining engineers and geologists, and through personal visits. Included are all mines and ore deposits of former, present and future importance. Among the 1407 deposits on the map, there are furthermore included all of doubtful value and many which are quite unworkable, but of geological interest, or those which mark the distribution of ore bearing formations. For this reason it has been necessary to mark the deposits with signs of different size. The object is only to facilitate a comprehensive view of the map, and is not an effort of economic classification, which for most of them would be quite impossible. The sizes refer to the presumed importance of the ore deposit, and has nothing to do with the extent of the mining operations. Mines and deposits out of work during the period 1913-1923 have been separately marked (see the legend), also deposits which were formerly of much greater importance than now. For the smallest mines and deposits no distinction has been made in these respects. Among them are represented partly those, which are in reality unworkable, partly those which are little investigated.

Rekstad, J. , 1921

	Eidsberg. De geologiske forhold innen rektangelkartet Eidsbergs område

;Norges geologiske undersøkelse;KARTBESKRIVELSE; BOK;NGU; No.88;76 sider

Abstrakt:

The territory is situated in south-eastern Norway to the east of the Oslofjord. It is an inland district which at no place reaches the sea. Glomma is the chief river which runs through the country in a southerly direction. The rocks occurring here are gneiss, granite, gabbro and schistose amphibolite, all of them of Archean age. Gneiss occupies a large area of the region. The rock has a varied appearance. Partly it is rich in mica (mica gneiss), partly it contains hornblende (hornblende-gneiss), partly it is coarse-grained and of granitoid texture. This latter form embraces also granite which has been deformed by powerful mechanical forces. This granite is intermixed with the gneiss in such a way as to make it impossible to separate them on the map. For the most part there is no distinctive demarcation between them, but the one passes into the other. The gneiss is mostly stratified, with well defined strike and dip. The granite intermixed is younger than the gneiss, but it belongs to the oldest known granites of Scandinavia. The gneiss is for the most part of igneous origin. Gabbro and amphibolite occur as numerous lenses injected into the gneiss. Connected with the gabbro here occurs nickelferous pyrrhotite. The greatest of these occurrences is at Romsås.

Feltprøver

	Prøvenr.	Prøvetype	Diverse
	Vestby01	Tipprøve	Prøvetaker :Mansur/Sandstad/...Lager :Løkken/...Vekt(kg) :2 Kommentar :Magnetkis+kobberkis disseminasjon i metagabbro Antall registrerte elementanalyser = 1

NB! Alle analyseverdier er vist i slutten av utskriften.:

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Analyseresultater

fra

Forekomstområde 123 - 002 Vestby

Elementanalyser

( *=parts pr. million, #=parts pr.billion, Negative verdier betyr under deteksjonsgrensen.)

Prøvenr.	Prøvetype	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
Vestby01	Tipprøve	3060	141	4	83	2280	.5	22.0

------------------

Prøvenr.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*
Vestby01	41.0	100.0	1	.3	60	0.88	1	0	2

------------------

Prøvenr.	Se*	Ga*	Ge*	In*	V*	Cr*	Mn*	Fe%	Th*
Vestby01	8.00	11.75	0.19	0.11	121	847	1120	11.25	0.69

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Prøvenr.	U*	W*	Rb*	Sr*	Y*	Zr*	Nb*	Ta*	Cs*
Vestby01	0.40	0	24.4	120.5	12.4	13	1.80	0.15	2.88

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Prøvenr.	La*	Ce*	Li*	Be*	P*	Sc*	Te*	Hf*	Re*
Vestby01	5.00	14.65	4	0	230	27.00	0.65	0.60	11

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Prøvenr.	Tl*
Vestby01	0

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