Norsk versjon
	THE ???? DATABASE
	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 04.01.2007)

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Genesis:	Hydrothermal vein	Form:	Plate
	Main texture:	Fracture filling	Min. distribution:	Irregular (scattered)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

Sericitisation

	Strike/Dip:	17 / 90	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Paleoproterozoic

	Province:	East Norwegian Basement Province
	Geotec.unit:	Romerike Complex
	Tectonic complex:	Mylonite Zone
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Sericite	Subordinate mineral (1-10%)
	Gangue mineral	Calcite	Subordinate mineral (1-10%)
	Ore mineral	Sphalerite	Major mineral (>10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Galena	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Fault plane	Strike/Dip :7 / 90	Syn-mineralisation ;...Effect :Controls
	Host rock	Joints/Fractures	Strike/Dip :17 / 90	Syn-mineralisation ;...Effect :Controls
	Host rock	Fault plane	Strike/Dip :27 / 90	Syn-mineralisation ;...Effect :Controls
	Host rock	Foliation	Strike/Dip :326 / 75	Pre-mineralisation ;...Effect :None
	Host rock	Foliation	Strike/Dip :340 / 80	Pre-mineralisation ;...Effect :None

Information(s) in free text format

Free text

Vinterstøa or Vestre Utsjøen prospects are situated close to the western shore of Lake Utsjøen. They represent small trial workings for gold, exploring local concentrations of sulphides in three separate quartz breccia-veins, which represent splays of a major NNE-SSW-trending normal fault along the shore of Utsjøen. The mineralised zones which are 1-2 m wide consist of a network of thin quartz veins and wider breccia zones intersecting variably sericite-altered gneiss granites of the Solør Complex and older fine-grained granitic migmatites of the Romerike Complex. The northernmost shallow pit measuring 2 m by 8 m is the main deposit which consists of quartz veins with disseminated aggregates and grains of chalcopyrite, spahlerite, galena and minor pyrite. The latter mineral occurs mainly as dissemination in the sericite-altered wall rocks. This deposit is rather anomalous for the Eidsvoll district by containing abundant sphalerite and no gold. The two other breccia veins contain only accessory pyrite and possible some Cu-sulphides as indicated by the presence of minor malachite. The vein in the middle prospect carries veinlets of red K-feldspar and only minor sulphides. The southern pit is worked on a quartz breccia-vein with abundant vugs and widespread comb- and cockade-type growth structures. Minor disseminated pyrite is only found inside abundant black gneisses occurring along the vein contact and as fragments in the vein. As described from the Lesja mine (AK0020) the black gneisses are caused by hydrothermal deposition of amorphous carbon.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	AK0123.01	Bedrock	Sampler: Ihlen, P.M./...Stored: Løkken Comment: Rusten melkekvarts med druserom. Ingen synlige sulfider. No. of registrated element analyses = 1
	AK0123.02	Bedrock	Sampler: Ihlen, P.M./...Stored: Løkken Comment: Massiv melkekvarts med røde albittårer. Ørlite py langs sene kvartsårer. No. of registrated element analyses = 1
	AK0123.03	Bedrock	Sampler: Ihlen, P.M./...Stored: Løkken Comment: Rusten og hm-farget melkekvarts med drusesoner med malakitt. No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

Name of Locality: Vinterstøa skjerp midtre

(Object Id: 15880 33,01,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Eidsvoll (1915-1)

Map 1:250000:

Hamar

Coordinate system:

UTM-Zone 33 - EUREF89/WGS84

East:

632697 m.

North:

6691350 m.

Longitude:

11.4038720

Latitude:

60.3368880

Show on map

Resource

	Resource Type:	Precious metals (Au,Ag,PGE)	Resource Subtype:	Gold
			Element(s):	Au Cu Fe-sulphides

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Hydrothermal vein	Strike/Dip :7 / 90

Name of Locality: Vinterstøa skjerp sør

(Object Id: 15848 33,02,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Eidsvoll (1915-1)

Map 1:250000:

Hamar

Coordinate system:

UTM-Zone 33 - EUREF89/WGS84

East:

632773 m.

North:

6691132 m.

Longitude:

11.4051030

Latitude:

60.3349070

Show on map

Resource

	Resource Type:	Precious metals (Au,Ag,PGE)	Resource Subtype:	Gold
			Element(s):	Fe-sulphides

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Hydrothermal vein	Strike/Dip :27 / 90

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	AK0123.AK0124.01	Bedrock	Sampler: Ihlen, P.M./...Stored: Løkken Comment: Hvit, albittisert fink. gneis. No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

---

The fact sheet was created on 18.04.2024

Copyright © 2024 Geological Survey of Norway