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THE ORE DATABASE
Occurence 4028 - 048 Åmli
(Object Id: 5489)
(Last updated: 28.03.2020)

Location
County: Telemark Municipality: Kviteseid (4028)
Map 1:50000: Bandak (1513-1) Map 1:250000: Skien
Coordinate system: EU89-UTM Zone 32
East: 464492 m. North: 6594088 m.
Longitude: 8.3731530 Latitude: 59.4837580
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Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Copper
Element(s): Kis Cu
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
1870 - 1870 Test mining Drift ved bruk av fyrsetting før 1860.
1887 - 1888 Test mining
1890 - 1907 Regular production Company/Institution :Konsul H.A. Reinert
Periodevis drift
2006 - 2006 Sampling Company/Institution :NGU

Mineralization
Era: Proterozoic Period: Neoproterozoic
Genesis: Hydrothermal vein Form: Plate
Main texture: Fracture filling Min. distribution: Irregular (scattered)
Main grain size: Fine grained (< 1 mm) Main alteration: No country rock alteration
Strike/Dip: 258 / 80 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: Oftefjell group Formation: Ofte formation

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Ore mineral Chalcopyrite Major mineral (>10%)

Lithology:
Relationship Rock Origin
Wall rock Porphyric quartz-feldspar rock Extrusive
Original rock :Rhyodacite
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :316 / 35 Pre-mineralisation ;...Effect :None

Information(s) in free text format
Free text
Forekomsten ligger i brattskråning rett ovenfor Åmli gårdene i Morgedal. En sti i øvre kant av den øvre del av dyrka marka fører fram til gruva. En 5 m lang dagskjæring fortsetter inn i en 12 m lang stoll søm fører fram til tverrslag hvor en har fulgt malmsona; mot øst (78º) i en lengde av 15 m og mot vest (268º) ca. 20 m. Dagslys kommer inn øverst i disse som er opptil 18-20 m høye. Mindre bergfester står igjen i tverrslagene. Fyrsetting skal ha vært benyttet under den første drifta i gruva, men det er ikke kjent når den pågikk. Ordinær drift ble gjort i 1860 med forsøksdrift senere ca. 1871, 1887-88 og trolig sporadisk i perioden 1890-1907 (Dons 1963). Rødlig grå, dels porfyrisk felsisk metavulkanitt dominerer i veggene. Den har foliasjon 316º/35º. Det skal ha været drevet på en 30-60 cm bred kvartsgang med hovedsakelig kobberkis (Dons 1963), men denne er ikke synlig i dag. I tippen som ligger som en tynn, bred (opptil 30-40 m) kjegle i brattskråningen nedenfor gruva finnes kobberkis som aggregater og strenger i grovkornet kvarts. Dette er en forekomsttype som ikke har noen økonomisk interesse i dag.

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
TE0103.01 Dump
Sampler: J.S. Sandstad/...Stored: L¿kken/...Size(kg): 1
Comment: Chalcopyrite aggregates/veinlets in medium-grained quartz
No. of registrated element analyses = 1
TE0103.02 Dump
Sampler: J.S. Sandstad/...Stored: L¿kken/...Size(kg): 2
Comment: Chalcopyrite aggregates/veinlets in coarse-grained quartz
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:


Analyse Results
from
Deposit Area 4028 - 048 Åmli

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#
TE0103.01 Dump 6860 -100 -100 -10 -10 13.0 60.0
TE0103.02 Dump 8700 -100 -100 10 -10 12.0 100.0
------------------
Sample No. As* Cd* Mo* Sb* Bi* Cr* Mn* Fe% W*
TE0103.01 -100 -10.0 -10.00 10 -100 -10 100 .98 -10
TE0103.02 -100 -10.0 -10.00 -10 -100 -10 -100 1.02 -10
------------------
Sample No. Sr* P* Ca*
TE0103.01 -10.0 0 0
TE0103.02 -10.0 -0 0


The fact sheet was created on 29.03.2024

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