Norsk versjon
	THE ORE DATABASE
	Deposit Area 237 - 036
	(Last updated 04.okt.2017)

Importance

Public:

Not Assessed (reg. 20.03.2017)

Economical:

Could be significant , (Confirmed 28.jan.2005 by Havard Gautneb)

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:		Method:
	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:	265 / 80	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Paleoproterozoic

	Province:	East Norwegian Basement Province
	Geotec.unit:	Solør 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	Accessory mineral (<1%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Hematite	Subordinate mineral (1-10%)
	Ore mineral	Carrollite	Subordinate mineral (1-10%)
	Ore mineral	Molybdenite	Accessory mineral (<1%)
	Ore mineral	Galena	Accessory mineral (<1%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)
	Ore mineral	Magnetite	Accessory mineral (<1%)
	Ore mineral	Gold	Accessory mineral (<1%)
	Ore mineral	Bornite	Accessory mineral (<1%)

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Fault plane	Strike/Dip :242 / 85	Syn-mineralisation ;...Effect :Controls
	Host rock	Fault plane	Strike/Dip :251 / 60	Syn-mineralisation ;...Effect :Controls
	Host rock	Fault plane	Strike/Dip :260 / 85	Syn-mineralisation ;...Effect :Controls
	Host rock	Fault plane	Strike/Dip :265 / 80	Syn-mineralisation ;...Effect :Controls
	Host rock	Fault plane	Strike/Dip :282 / 85	Syn-mineralisation ;...Effect :Controls
	Host rock	Foliation	Strike/Dip :320 / 60	Pre-mineralisation ;...Effect :None
	Host rock	Foliation	Strike/Dip :325 / 70	Pre-mineralisation ;...Effect :None
	Host rock	Foliation	Strike/Dip :328 / 80	Pre-mineralisation ;...Effect :Controls
	Wall rock	Fault plane	Strike/Dip :68 / 90	Post-mineralisation ;...Effect :Modifies
	Wall rock	Fault plane	Strike/Dip :87 / 90	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

The Røysivangen deposit includes a number of small prospects and an alluvial gold field situated in the valley between northern and southern Holsjøen lakes and shortly south of the summer-farm at Røysivangen. Most of the prospects occur on the eastern side of the valley where 5 small pits have been worked on small pockets of auriferous sulphide ores in a 1-2 m wide quartz vein. The westernmost pit (no. 1) is situated 15 m east of the dirt road between Guldkis and Brustad mines. The largest pit (no. 3) with an elliptical shape is water-filled and measures 5 m by 15 m. It occurs 70 m east of no. 1, whereas the eastern most (no. 5) are situated 200 m east of the road. The steep northerly dipping vein is situated along a roughly E-W- trending (N87E) normal fault in the western part of the vein system which in the east splays into a horsetail of thin veins in conjunction with an intersecting ENE-WSW-trending (N68E) normal fault. The mineralised vein intersects weakly sheared and steeply dipping granitic orthogneisses with NW-SE strike of their gneiss foliation. The dominant host rock is red coarse-grained gneiss granites of the Solør Complex that carries rafts of megacrystic granites and aplite dykes, both cutting older greyish red granitic migmatites of the Romerike Complex. The vein consists in most parts of massiv milky quartz, though quartz with comb structure and variably filled interstices is locally present. The vein is enveloped by a narrow zone of sericite alteration which rarely exceeds 0,2 m. The vein contact is sharp with the exception of areas where the vein bifurcates and the gneisses is intersected by a dense system of thin quartz veins producing areas with a breccia-like appearance containing veined slices of strongly quartz-sericite-altered gneisses. Several episodes of fracturing, vein formation and ore deposition can be recognised in a similar manner to the development of the Brustad deposit (see AK0021). Chalcopyrite, pyrite, hematite and native gold fill fractures and small cavities in brittlely deformed parts of the vein especially along the vein contact. Maximum gold contents are found in the ores from prospect no. 2 reaching 31,3 g/t Au. The mineralised quartz vein continues for more than 400 m towards the southwest on the western side of the valley where the vein contains erratic distributed pockets of mainly chalcopyrite with around 1 g/t Au (Wilhelm Tveter, pers. com., 1990). The vein shows a small offset in the valley where it intersects the Holsjøen-Lesja fault zone, which at Røysivangen contains a more than 5 m wide barren quartz vein. However, IP ground surveys (Dalsegg 1994) give clear anomalies over the western part of the vein between prospect no. 1 and 4 and fore more than 300 m along the Holsjøen-Lesja fault, mainly north of prospect no. 1. This indicate that auriferous sulphide ores may be present at depth in several segments of the vein system between Lesja farm and the summer-houses at Røysivangen. Prospector Wilhelm Tveter discovered in 1986 the presence of small gold nuggets and abundant gold flour in the quaternary deposits of the valley between Lesja and Røysivangen. He made a thorough investigation by excavating and panning the quaternary deposits, but due to environmental considerations the authorities stopped the plan for exploiting the gold. Instead he built a Yukon style cabin for himself and constructed a gold panning dam for tourists which together with a café was active for several summers at Røysivangen.

Bibliography:

From NGU's Reference Archive:

Dalsegg, Einar , 1990

	IP-målinger Røysivangen, Eidsvoll, Akershus.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.90.134;9 pages

Abstract:

Rapporten beskriver resultatene fra kombinerte elektriske målinger (Indusert polarisasjon og ledningsevne) over et mindre område ved Røysivangen i Eidsvoll kommune. Hensikten med undersøkelsen var å påvise eventuelle nye gullholdige minerali- seringer i området. IP-målingene påviste flere soner hvor anomaliårsaken trolig er svake sulfid- impregnasjoner. Den største er knyttet til Røysivangen skjerp og har en strøk- utstrekning på minimum 300 m. Ledningsevnemålingene indikerer at det langs hele måleområdet går en knusningssone. Denne er trolig kuttet av en forkast- ning. I og med at gullet i området er knyttet til sulfidene, er IP-målinger velegnet til å påvise hvor gullet kan være. Metoden anbefales derfor ved eventuelle videre undersøkelser i området.

Name of Locality : Røysivangen skjerp no. 1

(Object Id : 0237,036,01,00)

---

Location

County :

Akershus (02)

Municipality :

Eidsvoll (0237)

Map 1:50000:

Eidsvoll (1915-1)

Map 1:250000:

Hamar

Marking point:

Longitude:

11.3614700

Latitude:

60.3997990

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

630105 m.

Y-coord:

6698269 m.

Commodity

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

Production

	Activity:	Test mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Disused, closed	Volume of dump:	20 m3

Name of Locality : Røysivangen skjerp no. 2

(Object Id : 0237,036,02,00)

---

Location

County :

Akershus (02)

Municipality :

Eidsvoll (0237)

Map 1:50000:

Eidsvoll (1915-1)

Map 1:250000:

Hamar

Marking point:

Longitude:

11.3621960

Latitude:

60.3997950

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

630145 m.

Y-coord:

6698270 m.

Commodity

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

Production

	Activity:	Test mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Disused, closed	Volume of dump:	30 m3

Name of Locality : Røysivangen skjerp no. 4

(Object Id : 0237,036,03,00)

---

Location

County :

Akershus (02)

Municipality :

Eidsvoll (0237)

Map 1:50000:

Eidsvoll (1915-1)

Map 1:250000:

Hamar

Marking point:

Longitude:

11.3637450

Latitude:

60.3998750

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

630230 m.

Y-coord:

6698281 m.

Commodity

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

Production

	Activity:	Test mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Disused, closed	Volume of dump:	5 m3

Name of Locality : Røysivangen skjerp no. 5

(Object Id : 0237,036,04,00)

---

Location

County :

Akershus (02)

Municipality :

Eidsvoll (0237)

Map 1:50000:

Eidsvoll (1915-1)

Map 1:250000:

Hamar

Marking point:

Longitude:

11.3644600

Latitude:

60.3999610

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

630270 m.

Y-coord:

6698292 m.

Commodity

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

Production

	Activity:	Test mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Disused, closed	Volume of dump:	5 m3

Name of Locality : Røysivangen vestre skjerp

(Object Id : 0237,036,05,00)

---

Location

County :

Akershus (02)

Municipality :

Eidsvoll (0237)

Map 1:50000:

Eidsvoll (1915-1)

Map 1:250000:

Hamar

Marking point:

Longitude:

11.3592730

Latitude:

60.3990380

EU89-UTM Zone 32

(Coordinates IS confirmed)

X-coord:

629988 m.

Y-coord:

6698179 m.

Commodity

	Main Type:	Precious metals (Au,Ag,PGE)	Sub Type:	Gold
			Element(s):	Au Cu

Production

	Activity:	Test mining	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Disused, closed	Volume of dump:	1 m3

---

The fact sheet was created on 22.11.2024

Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no

Copyright © 2024 Geological Survey of Norway