Norsk versjon
THE ORE DATABASE
Occurence 1108 - 005 Helleknuten
(Object Id: 5013)
(Last updated: 25.02.2005)

Location
County: Rogaland Municipality: Sandnes (1108)
Map 1:50000: Høle (1212-1) Map 1:250000: Mandal
Coordinate system: EU89-UTM Zone 32
East: 335209 m. North: 6528769 m.
Longitude: 6.1421610 Latitude: 58.8670760
Show on map

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: Irregular
Main texture: Structureless Min. distribution: Massive (>50 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration:
Strike/Dip: Direction:
Plunge:
Stratigraphic classification of host rock
Era: Proterozoic Period: Mesoproterozoic
Province: South Norwegian Basement Province
Geotec.unit: Agder Complex
Tectonic complex:
Igneous complex:
Group: Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Feldspar Major mineral (>10%)
Gangue mineral Amphibole Major mineral (>10%)
Gangue mineral Biotite Subordinate mineral (1-10%)
Gangue mineral Garnet Accessory mineral (<1%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Chalcopyrite Subordinate mineral (1-10%)
Ore mineral Pentlandite Accessory mineral (<1%)

Lithology:
Relationship Rock Origin
Host rock Gabbro Intrusive
Original rock :Gabbro
Metamorphic facies :Amphibolite
Wall rock Banded gneiss Sedimentary
Original rock :Wacke
Metamorphic facies :Amphibolite

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Foliation Strike/Dip :210 / 30 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format
Free text
The mine pit is situated on a steep slope that starts from a rock plateau featuring a powerline. It consists of a 4H3m deep pit at the bottom of a 10-15m wide steep ledge. The main rock over the pit is dominated by medium to coarse grained granitic gneiss, with a few mafic bands. The host rock in the tailings is difficult to identify: it is partly intensely folded, partly brecciated and usually rusted, but presumably represents an altered and deformed gabbroic lense in the gneiss. It contains irregular, 5-10cm thick lenses of massive pyrrhotite with minor chalcopyrite (samples 01,04). In addition, sulphides occur in aggregates as well as disseminated in plagioclase-biotite " garnet rock (sample 02) and in fine grained gabbro (sample 03).

Photo(s) from the Deposit area:
Photo no. 1 showing Helleknuten skjerp"

Fieldsamples
Sample No. Sample type Miscellanrous
RO0140.01 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Massiv, middelskornet magnetkis med litt kobberkis, feltspat+amfibol i matriks.
No. of registrated element analyses = 1
RO0140.02 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Svak-moderat disseminasjon og enkelte aggregater av finkornet magnetkis i plagioklas(grønn)+biotitt+granat bergart.
No. of registrated element analyses = 1
RO0140.03 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Middelskornet magnetkis aggregater i finkornet gabbro.
No. of registrated element analyses = 1
RO0140.04 Dump
Sampler: J.S. Sandstad/...Stored: Løkken
Comment: Massiv magnetkismalm, fin- til grovkornet.
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:


Analyse Results
from
Deposit Area 1108 - 005 Helleknuten

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#
RO0140.01 Dump 2959 20 11 578 1855 .2 38.0
RO0140.02 Dump 2017 27 9 212 852 .5 63.0
RO0140.03 Dump 1162 28 5 141 594 .5 8.0
RO0140.04 Dump 2306 14 5 505 1755 .2 267.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* S%
RO0140.01 5.0 20.0 1 .6 32 37.00 2 3 13.25
RO0140.02 8.0 10.0 1 .6 63 7.00 2 2 4.89
RO0140.03 6.0 6.0 1 .4 39 3.00 2 2 3.20
RO0140.04 1.0 20.0 5 .5 38 13.00 2 4 12.85
------------------
Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*
RO0140.01 33 157 67 25.64 2.00 16.00 1 7.0 2.00
RO0140.02 71 201 127 11.17 2.00 8.00 1 19.0 2.00
RO0140.03 22 85 76 8.17 1.00 4.00 1 38.0 3.00
RO0140.04 28 130 71 24.82 1.00 14.00 1 5.0 2.00
------------------
Sample No. B*
RO0140.01 6
RO0140.02 7
RO0140.03 6
RO0140.04 7


The fact sheet was created on 20.10.2021

Questions or comments regarding the fact sheet can be emailed to:
ressursdatabaser@ngu.no
Copyright © 2021 Geological Survey of Norway