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THE ORE DATABASE
Occurence 4201 - 001 Dalsvatnet
(Object Id: 5275)
(Last updated: 25.02.2005)
Location
County: Agder Municipality: Risør (4201)
Map 1:50000: Gjerstad (1612-1) Map 1:250000: Arendal
Coordinate system: EU89-UTM Zone 32
East: 507619 m. North: 6515159 m.
Longitude: 9.1317780 Latitude: 58.7763820
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Resource
Resource Type: Ferroalloys (Cr,Ni,Co,V,Mo,W) Resource Subtype: Nickel
Element(s): Ni Cu Co
Importance
Raw material meaning: Little Importance (reg. 18.02.2015)

Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Operations
From - To Activity Comments
2000 - 2000 Sampling Company/Institution :NGU

Mineralization
Era: Proterozoic Period: Mesoproterozoic
Genesis: Orthomagmatic formation Form: Lens
Main texture: Structureless Min. distribution: Massive (>50 % ore minerals)
Main grain size: Coarse grained (> 3 mm) Main alteration: Skarn formation
Strike/Dip: 310 / 70 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Mesoproterozoic
Province: South Norwegian Basement Province
Geotec.unit: Bamble Complex
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Plagioclase Major mineral (>10%)
Gangue mineral Hornblende Major mineral (>10%)
Gangue mineral Quartz Subordinate mineral (1-10%)
Gangue mineral Apatite Subordinate mineral (1-10%)
Gangue mineral Garnet Subordinate mineral (1-10%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Chalcopyrite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Gabbro Intrusive
Original rock :Gabbro
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Foliation Strike/Dip :310 / 70 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format
Free text
The pit is situated in Glupedalen valley, west of Dalsvatnet lake and is best approached via the tractor track from Dale at the northern end of the lake. It is located on a forested hill, 30-40m over and slightly SE a few old houses. The pit consists of an essentially EW oriented trench with a 5m3 large tailings heap, but completely overgrown. The trench is 0.5-1m wide and 0.5m deep. At its W end, a very rusted schistose rock type containing biotite occurs, whereas nearby outcrops predominantly consist of gabbro. No ore has been observed, but presumably follows the gabbro foliation at 310/70. The tailings are dominated by very coarse grained hornblende-feldspar " quartz " garnet with dispersed sulphide grains. Blocks of massive coarse grained pyrrhotite with traces of chalcopyrite along the quartz lenses have been sampled.

Fieldsamples
Sample No. Sample type Miscellanrous
AA0103.01 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Massiv magnetkis+kobberkis, grovkornet i svært grovk. hornblende-feltspat+granat+kvarts skarn.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 4201 - 001 Dalsvatnet

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#
AA0103.01 Dump 888 7 9 833 1592 .2 7.0
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Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* S%
AA0103.01 4.0 6.0 25 1.6 6 1.00 2 3 24.30
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Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*
AA0103.01 19 11 149 34.12 3.00 24.00 1 51.0 67.00
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Sample No. B*
AA0103.01 2

The fact sheet was created on 01.05.2024
Questions or comments regarding the fact sheet can be emailed to:
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