Fact Sheet for <b>Occurence 4617

					Norsk versjon
	THE ORE DATABASE
	Occurence 4617 - 004 Nygruva
	(Object Id: 4714) (Last updated: 14.09.2022)

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

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

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: Varaldsøykomplekset

Igneous complex:

Group: 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.

Photo(s) from the Deposit area:

Photo no. 1 showing Østre skjæring"

Photo no. 2 showing Nygruva vest for veien"

Photo no. 3 showing Malmsone i vest"

Photo no. 4 showing Nygruva vest"

Photo no. 5 showing Malmblokk"

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+kart 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

Fieldsamples

Sample No. Sample type Miscellanrous

Nygruva 01 Dump

Sampler: J.S. Sandstad

Comment: Massive, fine grained pyrite with chalcopyrite and sphalerite strings/laminae

No. of registrated element analyses = 1

Nygruva 02 Dump

Sampler: J.S. Sandstad

Comment: Massive, fine grained, banded pyrite-sphalerite+chalcopyrite

No. of registrated element analyses = 1

Nygruva 03 Dump

Sampler: J.S. Sandstad

Comment: Massive, fine grained, badet pyrite-sphalerite+chalcopyrite

No. of registrated element analyses = 1

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

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

Fieldsamples

Sample No. Sample type Miscellanrous

Nygruva 04 Dump

Comment: Fine grained, weakly banded pyrite and subordinate sphalerite

No. of registrated element analyses = 1

Nygruva 05 Dump

Comment: Fine grained, weakly banded pyrite and subordinate sphalerite

No. of registrated element analyses = 1

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

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

Nygruva 01 Dump 4470 14050 432 20 13 21.9 609.0

Nygruva 02 Dump 5240 117500 43 11 15 27.6 2020.0

Nygruva 03 Dump 9750 53500 509 15 4 8.1 197.0

Nygruva 04 Dump 572 113000 2750 4 8 12.9 306.0

Nygruva 05 Dump 5190 64100 1120 16 9 28.0 785.0

------------------

Sample No. Pt# Pd# Rh# As* Cd* Ba* Mo* Sn* Sb*

HO0025.01 -3.0 -3.0 -5.0 31 116.5 1 2.00 -2

HO0025.02 -3.0 -3.0 -5.0 29 138.2 1 1.00 -2

HO0025.03 -3.0 -3.0 -5.0 53 32.2 1 -1.00 -2

Nygruva 01 27 32.6 10 14.60 7 1

Nygruva 02 40 283.0 -10 54.60 1 1

Nygruva 03 26 118.0 -10 31.40 2 1

Nygruva 04 46 210.0 -10 12.40 1 4

Nygruva 05 26 137.5 -10 31.50 13 1

------------------

Sample No. Bi* Se* Ga* Ge* In* S% V* Cr* Mn*

HO0025.01 22 31.19 39 4 402

HO0025.02 13 32.91 10 -1 119

HO0025.03 3 38.33 19 1 71

Nygruva 01 18 19.00 2.75 0.18 2.44 9.99 41 7 106

Nygruva 02 7 75.00 6.02 0.37 1.90 9.99 9 4 79

Nygruva 03 23 57.00 13.90 0.26 3.45 9.99 12 6 85

Nygruva 04 4 6.00 23.90 0.15 6.82 9.99 33 3 290

Nygruva 05 36 30.00 37.40 0.20 3.92 9.99 32 5 119

------------------

Sample No. Fe% Th* U* W* Rb* Sr* Y* Zr* Nb*

HO0025.01 18.52 -2.00 -5.00 -2 -1.0

HO0025.02 16.43 -2.00 -5.00 -2 5.0

HO0025.03 17.11 -2.00 -5.00 -2 1.0

Nygruva 01 36.20 0.03 0.60 0 1.3 2.7 2.6 2 0.10

Nygruva 02 28.60 0.01 -0.10 -0 0.1 0.4 0.2 -1 0.10

Nygruva 03 32.80 0.01 0.20 0 0.1 4.4 0.9 -1 0.10

Nygruva 04 32.80 -0.01 0.30 1 0.1 44.9 1.0 -1 -0.10

Nygruva 05 39.40 0.03 0.90 0 0.4 0.8 1.2 2 0.10

------------------

Sample No. Ta* Cs* La* Ce* B* Li* Be* P* Sc*

HO0025.01 -1.00 -3

HO0025.02 -1.00 -3

HO0025.03 -1.00 3

Nygruva 01 -0.05 -0.05 -0.50 0.65 1 -0 60 1.50

Nygruva 02 -0.05 -0.05 -0.50 0.30 1 -0 20 0.10

Nygruva 03 -0.05 -0.05 -0.50 0.43 0 -0 70 0.10

Nygruva 04 -0.05 -0.05 -0.50 0.51 0 -0 40 0.20

Nygruva 05 -0.05 -0.05 -0.50 0.22 1 -0 50 0.90

------------------

Sample No. Ti* Te* Hf* Re* Tl*

HO0025.01

HO0025.02

HO0025.03

Nygruva 01 220 17.45 0.10 0 1

Nygruva 02 -50 15.55 -0.10 0 1

Nygruva 03 -50 17.85 -0.10 0 0

Nygruva 04 -50 1.94 -0.10 0 0

Nygruva 05 190 30.10 0.10 0 0

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

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

Era:	Paleozoic	Period:	Ordovician
Genesis:	Volcex	Form:	Layer
Main texture:	Banded	Min. distribution:	Massive (>50 % ore minerals)

	Province:	Caledonides
	Geotec.unit:	Hardangerfjord Nappe Complex
	Tectonic complex:	Varaldsøykomplekset
	Igneous complex:

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%)

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

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

	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.

	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.

	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.

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
Nygruva 01	Dump	4470	14050	432	20	13	21.9	609.0
Nygruva 02	Dump	5240	117500	43	11	15	27.6	2020.0
Nygruva 03	Dump	9750	53500	509	15	4	8.1	197.0
Nygruva 04	Dump	572	113000	2750	4	8	12.9	306.0
Nygruva 05	Dump	5190	64100	1120	16	9	28.0	785.0

Sample No.	Pt#	Pd#	Rh#	As*	Cd*	Ba*	Mo*	Sn*	Sb*
HO0025.01	-3.0	-3.0	-5.0	31	116.5	1	2.00		-2
HO0025.02	-3.0	-3.0	-5.0	29	138.2	1	1.00		-2
HO0025.03	-3.0	-3.0	-5.0	53	32.2	1	-1.00		-2
Nygruva 01				27	32.6	10	14.60	7	1
Nygruva 02				40	283.0	-10	54.60	1	1
Nygruva 03				26	118.0	-10	31.40	2	1
Nygruva 04				46	210.0	-10	12.40	1	4
Nygruva 05				26	137.5	-10	31.50	13	1

Sample No.	Bi*	Se*	Ga*	Ge*	In*	S%	V*	Cr*	Mn*
HO0025.01	22					31.19	39	4	402
HO0025.02	13					32.91	10	-1	119
HO0025.03	3					38.33	19	1	71
Nygruva 01	18	19.00	2.75	0.18	2.44	9.99	41	7	106
Nygruva 02	7	75.00	6.02	0.37	1.90	9.99	9	4	79
Nygruva 03	23	57.00	13.90	0.26	3.45	9.99	12	6	85
Nygruva 04	4	6.00	23.90	0.15	6.82	9.99	33	3	290
Nygruva 05	36	30.00	37.40	0.20	3.92	9.99	32	5	119

Sample No.	Fe%	Th*	U*	W*	Rb*	Sr*	Y*	Zr*	Nb*
HO0025.01	18.52	-2.00	-5.00	-2		-1.0
HO0025.02	16.43	-2.00	-5.00	-2		5.0
HO0025.03	17.11	-2.00	-5.00	-2		1.0
Nygruva 01	36.20	0.03	0.60	0	1.3	2.7	2.6	2	0.10
Nygruva 02	28.60	0.01	-0.10	-0	0.1	0.4	0.2	-1	0.10
Nygruva 03	32.80	0.01	0.20	0	0.1	4.4	0.9	-1	0.10
Nygruva 04	32.80	-0.01	0.30	1	0.1	44.9	1.0	-1	-0.10
Nygruva 05	39.40	0.03	0.90	0	0.4	0.8	1.2	2	0.10