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THE ORE DATABASE
Occurence 4024 - 006 Gjuv
(Object Id: 5431)
(Last updated: 28.03.2020)
Location
County: Telemark Municipality: Hjartdal (4024)
Map 1:50000: Hjartdal (1614-3) Map 1:250000: Skien
Coordinate system: EU89-UTM Zone 32
East: 482709 m. North: 6608474 m.
Longitude: 8.6935800 Latitude: 59.6140950
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Bismuth
Element(s): Bi
Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)

Resources and production
Activity: Mining Reserves:
Operating method: Underground mining Historical production:


Operations
From - To Activity Comments
1862 - 1862 Test mining
1915 - 1918 Test mining
1988 - 1992 Geology Company/Institution :Århus Universitet
2006 - 2006 Sampling Company/Institution :NGU

Mineralization
Era: Proterozoic Period: Neoproterozoic
Genesis: Hydrothermal vein Form: Plate
Main texture: Fracture filling Min. distribution: Disseminated (<20 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration: Chloritisation
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Mesoproterozoic
Province: South Norwegian Basement Province
Geotec.unit: Telemark Supergroup
Tectonic complex:
Igneous complex:
Group: Vindeggen Group Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Tourmaline Subordinate mineral (1-10%)
Gangue mineral Carbonate Subordinate mineral (1-10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Bismutite Major mineral (>10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Galena Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Wall rock Amphibolite Intrusive
Original rock :Gabbro
Metamorphic facies :Amphibolite
Wall rock Quartzite Sedimentary
Original rock :Quartz sandstone
Metamorphic facies :Amphibolite

Information(s) in free text format
Free text
Den øvre del av forekomsten ligger rett øst for låven på gården Gjuv. Inngangen til en stoll som er ca. 50 n lang er nå fylt med skrot. Stollen skal være ca. 50 m lang. Fra stollinngangen går en 25 m lang dagskjæring med retning 325º nedover langs et bekkefar. Ca. 150 m lengre ned i samme retning er det anlagt en ny skjæring inn mot nedre stoll. Den er ca. 25 m lang og har retning 150º. Mindre forsøksdrift ble utført i 1862 og senere i perioden 1915-18. I 1917-18 ble det utskeidet ca. 8 t malm med 1,5 % Bi. Det er svært dårlig blottet omkring forkomsten da den er omgitt av dyrka mark. Øvre stoll er anlagt i finkornet, gråhvit kvartsitt, mens kloritt-rik amfibolitt dominerer i veggene i nedre skjæring. Der finnes en uregelmessig kvarts-turmalin gang med retning ca. 120º/50º. På tippene sees sulfidmineraliserte stuffer av kvarts+karbonat+turmalin. Vismutglans er mest vanlig i karbonatførende kvartsblokker. I tillegg finnes varierende mengder pyritt.

Bibliography:
From NGU's Reference Archive:
Dons, Johannes A. , 1963
De prekambriske bergarter i Telemark, I. Gruber og skjerp innen gradeteigkart E36V Kviteseid.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.216;1-80 pages
Abstract:
Approximately 115 mines and claims have been examined in the years 1941-1961 during regional geological mapping of the Kviteseid quadrangle. The map area covers a part of the "Thelemark-Sætersdal ore province" established by prof. J.H.L. Vogt in 1886. The oldest mine in the area, opened in the year 1524, was worked for silver bearing chalcopyrite and bornite. Other mines have been worked for gold, native copper and silver, molybdenite, galena, arsenopyrite, bismuthinite. All the mines have long since been abandoned and most of the surface workings are overgrown and difficult to find. The 15 native copper and silver deposits (which also contain vanadium minerals) form a separate group. They are all situated along the contact between a sandstone and an overlying basalt, the ore being confined to the sandstone. Most of the other deposits are of Quartz vein type. In quartzites which cover the greatest part of the map area, most of the quartz veins are barren. The great abundance of ore minerals in quartz veins in basic lavas and basic sills may be due to favourable pH conditions in these rocks. The galena deposits are found within a limited area close to a penetrating granite. The ore mineral paragenese in some of the deposits may have been formed under hypothermal to mesothermal conditions whereas other possibly originated at lower temperatures.

Fieldsamples
Sample No. Sample type Miscellanrous
TE0044.01 Dump
Sampler: J.S. Sandstad/...Stored: L¿kken/...Size(kg): 2
Comment: Pyrite+Bi-mineral, dissemination in turmaline-bearing quartz
No. of registrated element analyses = 1
TE0044.02 Dump
Sampler: J.S. Sandstad/...Stored: L¿kken/...Size(kg): 2
Comment: Bi-mineral+pyrite, aggregates in coarse-grained quartz+carbonate+turmaline vein
No. of registrated element analyses = 1
TE0044.03 Dump
Sampler: J.S. Sandstad/...Stored: L¿kken/...Size(kg): 2
Comment: Pyrite+Bi-mineral, strong dissemination in amphibole-quartz rock
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 4024 - 006 Gjuv

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#
TE0044.01 Dump 140 -100 200 20 10 -2.0 10.0
TE0044.02 Dump 300 -100 1000 -10 -10 3.0 20.0
TE0044.03 Dump 30 -100 -100 100 10 -2.0 10.0
------------------
Sample No. As* Cd* Mo* Sb* Bi* Cr* Mn* Fe% W*
TE0044.01 -100 -10.0 20.00 -10 1700 10 400 2.00 -10
TE0044.02 -100 -10.0 -10.00 30 9000 -10 3400 3.07 -10
TE0044.03 -100 -10.0 40.00 -10 600 -10 200 4.03 -10
------------------
Sample No. Sr* P* Ca*
TE0044.01 10.0 0 1
TE0044.02 60.0 0 8
TE0044.03 10.0 0 1

The fact sheet was created on 26.04.2024
Questions or comments regarding the fact sheet can be emailed to:
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