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THE ORE DATABASE
Occurence 4617 - 004 Nygruva
(Object Id: 4714)
(Last updated: 04.01.2022)

Location
County: Vestland Municipality: Kvinnherad (4617)
Map 1:50000: Varaldsøy (1215-2) Map 1:250000: Bergen
Coordinate system: EU89-UTM Zone 32
East: 333042 m. North: 6670696 m.
Longitude: 5.9934100 Latitude: 60.1390430
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Kis Zn Cu
Importance
Raw material meaning: Little Importance (reg. 26.05.2015)

Resources and production
Activity: Mining Reserves: 43 thousand tons
Operating method: Open pit and underground mining Historical production: 6 thousand tons


Products
Element/product Crude ore grade or quality Reg. date
Cu 0,7 % 21.06.2001
S 47 % 21.06.2001
Zn 3,4 % 21.06.2001

Operations
From - To Activity Comments
1865 - 1875 Regular production Company/Institution :Engelske interesser
1909 - 1910 Test mining Company/Institution :Chr. A. Münster
Skjerping, røsking, oppfaring, synkdrift.
1916 - 1919 Regular production Company/Institution :Norske Svovelkisgruver A/S, Bergen

Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Volcex Form: Layer
Main texture: Banded Min. distribution: Massive (>50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration:
Strike/Dip: 80 / 80 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Hardangerfjord Nappe Complex
Tectonic complex:
Igneous complex:
Group: Varaldsøykomplekset Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Sphalerite Subordinate mineral (1-10%)
Ore mineral Magnetite Accessory mineral (<1%)
Ore mineral Pyrrhotite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Wall rock Greenschist Extrusive
Original rock :Tuff
Metamorphic facies :Greenschist

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Primary layering Strike/Dip :80 / 80 Syn-mineralisation ;...Effect :None

Information(s) in free text format
Free text
The Nygruva deposit on Varaldsøy was probably discovered around 1865, and 300 tonnes of ore was produced from an adit in the eastern part of the deposit. Regular mining continued then in 1916-1919 with production of 5600 t of ore. The proven resources are in the order of 30 000 t. The deposit is situated along the contact between metabasalt or tuff and minor bodies of feldspar porphyric rhyodacite. The ore body is a ruler with a thickness of 1-3 m, and has been worked for a length of c. 260 m and followed along strike for 310 m. It is a fine-grained pyritic banded ore with minor amounts of sphalerite, chalcopyrite and magnetite. Main gangue is quartz. Average grades are 47.2 % S, 40.9 % Fe, 0.68 % Cu, 3.40 % Zn, 0.05 % Pb, 0.013 % As og 0.0036 % Se. Three analyses show between 0.3 and 1.3 ppm Au.

Bibliography:
From NGU's Reference Archive:
Bjørlykke, H. , 1957
Rapport over Varaldsøy Gruber og malmstrøket Varaldsøy - Nygruben - Hisdalen.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 6308;8 pages
Abstract:
Rapporten oppsummerer geologiske forhold, geologiske resultater og malmberegninger. Feltet omtales som forholdsvis lovende m.h.p. drift i liten skala. Forekomstnr. 20082, 20287 og 20290. Forekomstens navn og koordinater: Nygruva 32 3330 66708, Varaldsøy, Hisdalen 32 3309 66699. Valaheia 32 3345 66717.

Egge, A.
Nygruben.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1869;4 pages
Abstract:
Resultater av røskearbeider beskrives med tilhørende malmbergninger. Malmen består av relativt rik svovelkismalm med 2,7 % Zn og 0,82 % Cu gjennomsnitt, og omtales som mere lovende enn Valaheien gruve.

Foslie, Steinar; Dietrichson, Brynjulf , 1955
Kisdistriktet Varaldsøy-Ølve i Hardanger og bergverksdriftens historie.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.147;1-106 pages
Abstract:
When Steinar Foslie suddenly passed away in november 1951, he had finished the geological map here presented: "Kisdistriktet Varaldsøy-Ølve i Hardanger", based on field-work during 1942-49. Furthermore his M.S. contained a thorough petrological description of the rocks (p. 1f.) and the history of the copper-mining in the Ølve-district "Christiansgaves (Lilledale) kobberverk" from the two periods 1642-73 and 1759-85, holding a lot of items based on the study of records (p. 55 f.). These M.S. are printed unaltered, introduced by the author's own preface. The paper as a whole must be looked on as a basic draft only: An obviously planned section treating the ore deposits and their mineralogy has not been worked out, yet the facts presented may throw light upon general problems connected with the pyrite-deposits of Norway. As appears from the map the predominant rock in the pyrite-district is greenstone, more or less schistose. The term "greenstone" is here used for basic lavas and tuffs only, while the designation "the greenstone formation" is used by Foslie in the same sense as for the widely extended pyrite-bearing group in the Trondheim-district.

Stadheim, J. F. F.
Varaldsø kisgruber.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 959;107 pages
Abstract:
Lok. Nr. 20082, 20287, 20290 Rapporten gir en omfattende oversikt over svovelkisforekomster på Varaldsø med en rekke gode skisser av malm og gruveanlegg. Malmmektigheter, gehalter og gruvetekniske forhold beskrives utførlig.

Wulff, Peter Wilhelm , 1996
En befaring af cirka 100 mineraliseringer i Sunnhordland, SV-Norge
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.96.139;100 pages
Abstract:
Forfatteren var sommeren 1994 engasjert av NGU for å gjøre et arbeid i Sunn- hordland i forbindelse med planlagt utgivelse av en publikasjon om Norges gullforekomster. Samtidig kunne Malmdatabasen gjøres ferdig for dette området. Rapporten beskriver resultatene av malmregistrering i Sunnhordland som om- fatter ca. 100 mineraliseringer. Disse er koordinatfestet og geologisk beskrevet. I tillegg er det gitt gruvehistoriske kommentarer av forekomstene og referanser. Resultatene fra denne rapport er innlagt i NGUs Malmdatabase. Rapporten gis av praktiske grunner ut i dansk språkform som den foreligger fra forfatter.

Foslie, Steinar , 1926
Norges svovelkisforekomster.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.127;122 pages
Abstract:
This paper was written in English for the XIV International Geological Congress, Madrid 1926, as a part of its monograph on the Pyrite Resources of the World. The present Norwegian edition has nearly the same content. However, the geological review is a little more extensive, the production statistics have been carried a year forward, to the end of 1925, and some more illustrations are given. The English reader is referred to monograph of the Congress, as only a short statement of the contents is given here. On page 7-13 will be found a short account of the relation of pyrite deposits to the Caledonian mountain chain in Norway. The author maintains, that the main part of its intrusives, and with them the pyrite deposits, belong to the first period of folding processes of the Norwegian mountain chain, probably of Lower Ordovician age. On page 13-18, the characteristic features of the Norwegian pyrite deposits are described, and a summary of the recent views concerning their geology is given. According to these, a small group of pyrite deposits are bio-chemical sediments between basaltic, submarine lava beds, the greatest part of them are magmatic differentiates from gabbroidal intrusives, and a last group are hydromagmatic or hydrothermal deposits.

Fieldsamples
Sample No. Sample type Miscellanrous
HO0025.01 Bedrock
Sampler: Wulff, P./...Stored: Løkken
Comment: Fink. py-malm med 30 % kvarts som det er litt cpy i.
No. of registrated element analyses = 1
HO0025.02 Bedrock
Sampler: Wulff, P./...Stored: Løkken
Comment: Fink. py-malm. Mest utbredte malmtype i Nygruven.
No. of registrated element analyses = 1
HO0025.03 Bedrock
Sampler: Wulff, P./...Stored: Løkken
Comment: Deformert (svakt foldet) fink. py-malm.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Trench
(Object Id: 32789 4,01,00)

Location
County: Vestland Municipality: Kvinnherad (4617)
Map 1:50000: Varaldsøy (1215-2) Map 1:250000: Bergen
Coordinate system: EU89-UTM Zone 32
East: 333005 m. North: 6670685 m.
Longitude: 5.9927680 Latitude: 60.1389250
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Kis Zn Cu


Name of Locality: Trench
(Object Id: 32790 4,02,00)

Location
County: Vestland Municipality: Kvinnherad (4617)
Map 1:50000: Varaldsøy (1215-2) Map 1:250000: Bergen
Coordinate system: EU89-UTM Zone 32
East: 332945 m. North: 6670674 m.
Longitude: 5.9916980 Latitude: 60.1388020
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Kis Zn Cu


Name of Locality: Trench
(Object Id: 32791 4,03,00)

Location
County: Vestland Municipality: Kvinnherad (4617)
Map 1:50000: Varaldsøy (1215-2) Map 1:250000: Bergen
Coordinate system: EU89-UTM Zone 32
East: 332914 m. North: 6670668 m.
Longitude: 5.9911450 Latitude: 60.1387440
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Kis Zn Cu


Name of Locality: Trench
(Object Id: 32792 4,04,00)

Location
County: Vestland Municipality: Kvinnherad (4617)
Map 1:50000: Varaldsøy (1215-2) Map 1:250000: Bergen
Coordinate system: EU89-UTM Zone 32
East: 333089 m. North: 6670708 m.
Longitude: 5.9942520 Latitude: 60.1391690
Show on map

Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Zinc
Element(s): Kis Zn Cu



Analyse Results
from
Deposit Area 4617 - 004 Nygruva

Element analyses

( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)
Sample No. Sample Type Cu* Zn* Pb* Co* Ni* Ag* Au#
HO0025.01 Bedrock 27977 49319 361 19 8 49.6 1261.0
HO0025.02 Bedrock 10095 61309 154 2 7 14.6 631.0
HO0025.03 Bedrock 4257 15349 480 -1 2 10.0 267.0
------------------
Sample No. Pt# Pd# Rh# As* Cd* Ba* Mo* Sb* Bi*
HO0025.01 -3.0 -3.0 -5.0 31 116.5 1 2.00 -2 22
HO0025.02 -3.0 -3.0 -5.0 29 138.2 1 1.00 -2 13
HO0025.03 -3.0 -3.0 -5.0 53 32.2 1 -1.00 -2 3
------------------
Sample No. S% V* Cr* Mn* Fe% Th* U* W* Sr*
HO0025.01 31.19 39 4 402 18.52 -2.00 -5.00 -2 -1.0
HO0025.02 32.91 10 -1 119 16.43 -2.00 -5.00 -2 5.0
HO0025.03 38.33 19 1 71 17.11 -2.00 -5.00 -2 1.0
------------------
Sample No. La* B*
HO0025.01 -1.00 -3
HO0025.02 -1.00 -3
HO0025.03 -1.00 3


The fact sheet was created on 21.01.2022

Questions or comments regarding the fact sheet can be emailed to:
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