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	MALMDATABASEN
	Forekomstområde 237 - 002
	(Sist oppdatert 01.mar.2005)

Betydning

Offentlig:

Liten betydning (reg. 18.02.2015)

Økonomisk:

Lite viktig , (Stadfestet 28.jan.2005 av Havard Gautneb)

Mineralisering

	Æra:	Proterozoikum	Periode:	Neoproterosoikum
	Datering:	776 (-8\+8) million år	Metode:	K/Ar
	Genese:	Hydrotermal gang	Form:	Plate
	Hovedtextur:	Sprekkefylling	Min. fordeling:	Uregelmessig

Kornstørrelse:

Middelskornet (1-3 mm)

Hovedomvandling:

Serisittisering

	Strøk/Fall:	276 / 75	Retning:
			Feltstupning:

Stratigrafisk klassifikasjon av vertsbergart

Æra:

Proterozoikum

Periode:

Paleoproterosoikum

	Provins:	Østnorske grunnfjellsprovins
	Geotek.enhet:	Romerikskomplekset
	Tektonisk complex:	Mylonite Zone
	Intrusivt komplex:

Gruppe:

Formasjon:

Mineralogi

	Relasjon	Mineral	Mengde
	Gangmineral	Kvarts	Hovedmineral (>10%)
	Gangmineral	Kalkspat	Underordnet mineral (1-10%)
	Gangmineral	Serisitt	Underordnet mineral (1-10%)
	Malmmineral	Svovelkis	Hovedmineral (>10%)
	Malmmineral	Kobberkis	Hovedmineral (>10%)
	Malmmineral	Gull	Aksessorisk mineral (<1%)
	Malmmineral	Blyglans	Aksessorisk mineral (<1%)
	Malmmineral	Sinkblende	Aksessorisk mineral (<1%)
	Malmmineral	Hematitt	Aksessorisk mineral (<1%)
	Malmmineral	Magnetitt	Aksessorisk mineral (<1%)
	Malmmineral	Bornitt	Aksessorisk mineral (<1%)
	Malmmineral	Magnetkis	Aksessorisk mineral (<1%)

Strukturer

	Lokalisering:	Type:	Orientring(360¤):	Relasjon til min.:
	Vertsbergart	Sprekker	Strøk/Fall :266 / 80	Syn-mineralisering ;...Effekt :Kontrollerer
	Vertsbergart	Sprekker	Strøk/Fall :293 / 70	Syn-mineralisering ;...Effekt :Kontrollerer
	Vertsbergart	Foliasjon	Strøk/Fall :317 / 60	Pre-mineralisering ;...Effekt :Ingen
	Vertsbergart	Foliasjon	Strøk/Fall :344 / 45	Pre-mineralisering ;...Effekt :Ingen

Opplysning(er) i fritekstformat

Fri tekst

The mine is situated at the top of the steep western hill side immediately north of Steinbekk farm east of Vorma river. The mine was worked along a meter wide quartz vein cutting reddish and greyish coarse-grained migmatitic biotite gneisses of the Paleoproterozoic Romerike Gneiss Complex. The main vein which can be followed over a distance of 260 m, is only sulphide-bearing in its western and eastern part. Mining in its western part occurred in a now 42 m long, 15-20 m deep and 3-5 m wide open pit which at the bottom is connected with an adit starting at the bottom of the steep hillside towards the west, where the vein pinches out. The pit is not accessible, since the adit is closed by a dam, representing a water reservoir for the local people. Mining started originally in the Old Sander mine representing a deep, now water-filled, shaft that was sunk on a sulphide-bearing segment of the vein about 200 m east of the open pit. Between these two mining sites trenches has been dug through the overburden along the vein, but no ore has apparently been found. The vein is developed along a system of steep northerly dipping fractures with strike direction between N85E and N110E. Immidiately east of the shaft the strike direction of the vein shifts to southeasterly, i.e. N150-160E or roughly parallel to the foliation of the gneisses. The 0,5-1,5 m wide quartz vein consists of massiv milky quartz that locally shows comb and cockade structure with crystal interstices partly filled with calcite and/or pyrite-chalcopyrite aggregates. It is enveloped by a 0,5 m wide zone of altered wall rocks that includes variable intensity of silicification, quartz-sericite- and chlorite-alteration, as well as carbonatisation. The ore mineralisation is mainly developed along the margin of the vein in the silicified and sericite-altered gneisses which carry erratic concentrations of disseminated pyrite and quartz-sulphide veins with pyrite, chalcopyrite and sub-ordinate galena. Microscopic examinations reveal the presence of carrolite, native gold and hematite as additional constituents. Native gold occurs as tiny droplets along microfractures in pyrite and as intergrowth with chalcopyrite and galena which replace pyrite along microfractures. The gold contents of the sulphide ores reach a maximum of 2,9 g/t. The eastern vein sub-concordant with the gneiss foliation is totally devoid of sulphides and associated wall-rock alteration.

Navn på lokalitet : Hoel gruve

(Objekt Id : 0237,002,01,00)

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Lokalisering

Fylke :

Akershus (02)

Kommune :

Eidsvoll (0237)

Kart 1:50000:

Eidsvoll (1915-1)

Kart 1:250000:

Hamar

Markeringspunkt:

Lengdegrad:

11.2883260

Breddegrad:

60.3615810

EU89-UTM Zone 32

(Koordinatene ER bekreftet)

X-koord:

626225 m.

Y-koord:

6693872 m.

Materialtype

	Hovedtype:	Edelmetaller (Au, Ag, PGE)	Subtype:	Gull
			Element(er):	Au Fe-sulphides Cu

Produksjon

	Aktivitet:	Gruvedrift	Reserver:
	Prod. metode:	Dagbrudd	Produksjon:
	Prod. status:	Nedlagt	Tippvolum:

Strukturer

	Lokalisering:	Type:	Orientring(360¤):	Relasjon til min.:
	Vertsbergart	Hydrotermalåre	Strøk/Fall :270 / 80

Navn på lokalitet : Steinbekken skjerp

(Objekt Id : 0237,002,02,00)

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Lokalisering

Fylke :

Akershus (02)

Kommune :

Eidsvoll (0237)

Kart 1:50000:

Eidsvoll (1915-1)

Kart 1:250000:

Hamar

Markeringspunkt:

Lengdegrad:

11.2886090

Breddegrad:

60.3612170

EU89-UTM Zone 32

(Koordinatene ER bekreftet)

X-koord:

626242 m.

Y-koord:

6693832 m.

Materialtype

	Hovedtype:	Edelmetaller (Au, Ag, PGE)	Subtype:	Gull
			Element(er):	Au Fe-sulphides

Produksjon

	Aktivitet:	Prøvedrift	Reserver:
	Prod. metode:	Dagbrudd	Produksjon:
	Prod. status:	Nedlagt	Tippvolum:

Strukturer

	Lokalisering:	Type:	Orientring(360¤):	Relasjon til min.:
	Vertsbergart	Hydrotermalåre	Strøk/Fall :322 / 70

Navn på lokalitet : Sanderhaugen stoll

(Objekt Id : 0237,002,03,00)

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Lokalisering

Fylke :

Akershus (02)

Kommune :

Eidsvoll (0237)

Kart 1:50000:

Eidsvoll (1915-1)

Kart 1:250000:

Hamar

Markeringspunkt:

Lengdegrad:

11.2837210

Breddegrad:

60.3615970

EU89-UTM Zone 32

(Koordinatene ER bekreftet)

X-koord:

625970 m.

Y-koord:

6693865 m.

Materialtype

	Hovedtype:	Edelmetaller (Au, Ag, PGE)	Subtype:	Gull
			Element(er):	Fe-sulphides Cu

Produksjon

	Aktivitet:	Prøvedrift	Reserver:
	Prod. metode:	Underjordsdrift	Produksjon:
	Prod. status:	Nedlagt	Tippvolum:

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Faktaarket ble generert 22.11.2024

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