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THE INDUSTRIAL MINERAL DATABASE
Occurence 4214 - 384 Skinnfjordene
(Object Id: 13070)
(Last updated: 27.04.2007)
Location
County: Agder Municipality: Froland (4214)
Map 1:50000: Mykland (1512-2) Map 1:250000: Arendal
Coordinate system: EU89-UTM Zone 32
East: 468019 m. North: 6493300 m.
Longitude: 8.4500590 Latitude: 58.5789470
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Resource
Resource Type: Feldspar Resource Subtype: Pegmatitic feldspar

Importance
Raw material meaning: Not Assessed (reg. 18.02.2015)


Mineralization
Genesis: Form:
Main texture: Min. distribution:
Main grain size:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Period:
Province:
Geotec.unit:
Tectonic complex:
Igneous complex:
Group: Formation:

Information(s) in free text format
Free text
Granittisk pegmatitt som stryker NV-SØ langs åssiden på østsiden av dalføret ved Skinnfjordene. Pegmatitten er ca. 160m lang og 30m bred og gjennomsetter grå felsiske båndgneiser (Breivik 1984). En mindre forsøksdrift er anlagt nær sørvest-grensen av kroppen. Bruddet er ovalt, med lengste akse parallelt kontakten. Det er ca. 30m langt, 20m bredt og opptil 7m dypt. Pegmatitten faller steilt mot NØ. Den består av 1-1,5m lange rosa til blek rosa K-feltspat krystaller og opptil 0,5m lange plagioklas krystaller som er sammenvokst med hovedsakelig røkkvarts og K-feltspat samt litt plagioklas, biotitt og muskovitt. Pegmatittens terrengmessige plassering og dimensjoner tilsier at den skulle ha et stort driftpotensial.

Bibliography:
From NGU's Reference Archive:
Ihlen, Peter M.; Furuhaug, Leif , 2001
Gold resources on Ringvassøy, Troms-III: Geochemistry of heavy-mineral concentrates from stream sediments and potential gold sources
;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.2000.059;104 pages
Abstract:
The geochemistry of heavy-mineral concentrates panned from stream sediments on Ringvassøy is reported. The presently known occurrences of gold inside the RGB comprise mostly quartz-vein mineralisation with a low economic potential. The stratabound Au-As-Zn mineralisation at Sørdalshøgda-South is the only one that, under favourable conditions, can be of economic interest. All of these gold occurrences were detected by the panning method together with most of the deposits carrying high concentrations of Ag, Cu, Zn, As and Sb. The geochemistry of heavy-mineral concentrates shows that the metal enrichment is mainly confined to rivers inside the RGB, whereas those in the DTC and the Caledonides carry normal background levels.

Fieldsamples
Sample No. Sample type Miscellanrous
P050.01 Hand specimen
Sampler: Peter Ihlen/...Stored: Løkken
Comment: Nordveggen av brudd. Røkkvarts sammenv. med litt rosa K-feltspat
No. of registrated mineral analyses = 1
050,GK Hand specimen
Sampler: Peter Ihlen/...Stored: Løkken
Comment: Ren rosa K-feltspat
No. of registrated oxide analyses = 1
050,GP Hand specimen
Sampler: Peter Ihlen/...Stored: Løkken
Comment: Ren plagioklas
No. of registrated oxide analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 4214 - 384 Skinnfjordene

Mineral analyses
( All values are in ppm. Negative values means below detection limit value.)
Sample No. Sample Type Mineral Li Be B
P050.01 Hand specimen Quartz 7.120 .083 .350
------------------
Sample No. Al P K Ti Fe Ge Rb Sr Pb
P050.01 42.349 41.942 .491 7.647 .424 2.696 -.010 .026 .008

Oxide analyses
( All values are in % )
Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 MgO CaO Na2O
050,GK Hand specimen 65.50 18.34 0.00 0.04 0.01 0.10 1.68
050,GP Hand specimen 64.70 22.42 0.00 0.06 0.03 3.38 8.45
------------------
Sample No. K2O Sum
050,GK 13.95 100.00
050,GP 1.76 101.00

The fact sheet was created on 03.05.2024
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