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Occurence 3035 - 036 Røysivangen gruve no. 3
(Object Id: 15869)
(Last updated: 04.10.2017)
Drill Cores: Røysivangen gruve no. 3

Location
County: Viken Municipality: Eidsvoll (3035)
Map 1:50000: Eidsvoll (1915-1) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 630176 m. North: 6698274 m.
Longitude: 11.3627440 Latitude: 60.3998300
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au Cu
Importance
Raw material meaning: Not Assessed (reg. 20.03.2017)

Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production:


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: 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: 15870 36,01,00)

Location
County: Viken Municipality: Eidsvoll (3035)
Map 1:50000: Eidsvoll (1915-1) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 630105 m. North: 6698269 m.
Longitude: 11.3614700 Latitude: 60.3997990
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Fe-sulphides Au
Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production:


Name of Locality: Røysivangen skjerp no. 2
(Object Id: 15871 36,02,00)

Location
County: Viken Municipality: Eidsvoll (3035)
Map 1:50000: Eidsvoll (1915-1) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 630145 m. North: 6698270 m.
Longitude: 11.3621960 Latitude: 60.3997950
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au Fe-sulphides Cu
Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production:


Name of Locality: Røysivangen skjerp no. 4
(Object Id: 15872 36,03,00)

Location
County: Viken Municipality: Eidsvoll (3035)
Map 1:50000: Eidsvoll (1915-1) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 630230 m. North: 6698281 m.
Longitude: 11.3637450 Latitude: 60.3998750
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Fe-sulphides Au
Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production:


Name of Locality: Røysivangen skjerp no. 5
(Object Id: 15873 36,04,00)

Location
County: Viken Municipality: Eidsvoll (3035)
Map 1:50000: Eidsvoll (1915-1) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 630270 m. North: 6698292 m.
Longitude: 11.3644600 Latitude: 60.3999610
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Fe-sulphides Au
Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production:


Name of Locality: Røysivangen vestre skjerp
(Object Id: 15874 36,05,00)

Location
County: Viken Municipality: Eidsvoll (3035)
Map 1:50000: Eidsvoll (1915-1) Map 1:250000: Hamar
Coordinate system: EU89-UTM Zone 32
East: 629988 m. North: 6698179 m.
Longitude: 11.3592730 Latitude: 60.3990380
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Resource
Resource Type: Precious metals (Au,Ag,PGE) Resource Subtype: Gold
Element(s): Au Cu
Resources and production
Activity: Test mining Reserves:
Operating method: Open pit mining Historical production:


The fact sheet was created on 26.10.2021

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