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THE ORE DATABASE
Deposit Area 1129 - 002
(Last updated 25.feb.2005)

Name of Deposit Area : Lastebotn
(Object Id : 1129,002,00,00)
Location
County : Rogaland (11) Municipality : Forsand (1129)
Map 1:50000: Høle (1212-1) Map 1:250000: Mandal
Marking point: Longitude: 6.1215720 Latitude: 58.9352730
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-coord: 334349 m. Y-coord: 6536410 m.
Commodity
Main Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Sub Type: Copper
Element(s): Cu Ni Co
Production
Activity: Mining Reserves:
Prod. method: Underground mining Production:
Prod. status: Disused, closed Volume of dump: 500 m3

Importance
Public: Little Importance (reg. 18.02.2015)
Economical: Minor interest , (Confirmed 14.jun.2001 by Jan Sverre Sandstad)

Operations
From - To Activity Comments
1767 - 1777 Regular production Company/Institution :Enighedens Kobberverk
1868 - 1870 Test mining Company/Institution :Engelske interesser
Omtrentlig tidsperiode.
1880 - 1882 Test mining Company/Institution :Belgiske interesser
Omtrentlig tidsperiode
1915 - 1917 Test mining Company/Institution :Grosserer Mossige o.a. fra Stavanger
2000 - 2000 Sampling Company/Institution :NGU

Mineralization
Era: Proterozoic Period: Mesoproterozoic
Dating: Method:
Genesis: Orthomagmatic formation Form: Irregular
Main texture: Structureless Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Medium grained (1-3 mm) Main alteration: No country rock alteration
Strike/Dip: 230 / 50 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 Quartz Major mineral (>10%)
Gangue mineral Feldspar Major mineral (>10%)
Gangue mineral Amphibole Major mineral (>10%)
Gangue mineral Apatite Subordinate mineral (1-10%)
Gangue mineral Biotite Accessory mineral (<1%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Chalcopyrite Major mineral (>10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Magnetite Accessory mineral (<1%)
Ore mineral Pentlandite Accessory mineral (<1%)

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

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Wall rock Mineral banding Strike/Dip :204 / 45 Post-mineralisation ;...Effect :None
Wall rock Foliation Strike/Dip :214 / 55 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format
Free text
The mining area is located in a small valley between a smaller bay and the road on the E side of Lysefjorden, at approximately 2km N of the bridge at Lysefjordbrua. Particularly NW of the area, slopes are very steep. Today, extraction pits extend over 200m in NE-SW direction. Probably, the northernmost of the original mining area is now covered by road base materials. Substantial egalisation of the tailings heaps and backfilling of shafts has been done over the past decades. The main tailings heap today serves as a parcel for a newly built residence and ore chunks have been used for a garden fence. A garage has been put in front of the adit. Older reports provide no clear conclusion on when the deposit was in production, but there appear to have been three separate periods. The deposit supposedly was first identified in 1747, and Enighetens Kobberverk started in 1764. Production seems to have been continuous for 8-10 years, with deliveries to the smelter at Hjelmelandsvågen that produced 18.000 thaler for Bergen municipality. The next production periods around 1870 and 1880 saw interest from English and Belgian investors respectively. Around WWI (late 1910's), some tradesmen from Stavanger showed interest in the deposit. Geographical coordinates apply to the center of the main extraction area, consisting of a 50m long adit in the SW, continuing with a 30m long cut towards the NE at 040. Smaller shafts have been driven at 35m and 55m further NE. Two shafts in the main adit have been backfilled with large blocks. According to aged reports, the extraction seems to have been driven at 45m along the fall with a maximum width of 10m. The country rock in the area is characterized as banded gneiss with alternating medium grained quartz-feldspar and finer grained bands containing hornblende up to 0.3m thick. The orientation of the banding is variable from 190-215E, but with a constant fall of 45E towards WSW. Nearby road cuts reveal isoclinal folding of the entire sequence. The sulphide mineralization is connected to 1-3m wide band with medium to fine grained leuconorite/gabbro at small angles with the gneiss banding. Pyrite, pyrrhotite, and chalcopyrite occur in variable amounts both disseminated, in bands and veins. Less pronounced mineralization also occurs in the gneiss and seems related to later pegmatite veins (0.1-0.5m) and quartz mobilisates. At the NE entrance of the adit, the ore zone is 0.1-0.3m thick (sample 01). The zone is irregularly shaped but follows norite orientation. Outside the SW adit entrance, several ore zones occur up to 0.5m thick oriented 230/050 (sample 02). The most common mineralization on the tailings is ore of disseminated type and veins with pyrrhotite, pyrite and minor chalcopyrite in fine grained gabbroic rock (sample 05), whereas massive pyrrhotite (sample 06) and pyrrhotite-chalcopyrite (sample 07) ores occur as well. Veins and bands containing comparatively pure chalcopyrite occur in silicified gabbro near pegmatite veins (sample 08). The locality farthest N consists of a 3H3m vertical shaft in medium grained gabbro, containing a single pegmatite vein (10-15cm) oriented 260/060, virtually parallel to the ore zone. Massive ore wasn¿t found; moderate to weakly disseminated mineralization and veins with chalcopyrite-pyrrhotite-pyrite occur in fine grained mafic host (sample 04). Weak sulphide dissemination and major magnetite lumps occur in the pegmatite (sample 03).

Bibliography:
From NGU's Reference Archive:
Lenschow, J. , 1917
Enighets Grube.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 2165;2 pages
Abstract:
Forekomsten opptrer som nikkelholdig magnetkis og kobberkis. De omliggende bergartene består av gneis, mørk glimmerskifer og en gabbrobergart. Forekomsten kan følges ca 150 m og mektigheten er opptil 1 m. Forekomsten er ikke drivbar pga. lavt metallinnhold og små malmressurser.

Egge, A. , 1910
"Enighedens kobberverks grube" i Forsand, Høgsfjorden, Ryfylke.
;Norges geologiske undersøkelse;RAPPORT;Bergarkivet; No.BA 473;2 pages
Abstract:
Rapporten beskriver sulfidmineraliseringer ved: - Rennesøy, hvor det forekommer fattig impregnasjon av svovelkis som opptrer i linser i hornblendeskifer. - Fossan. Mineraliseringen opptrer her uregelmessig og er svovelkis - og kobberkis. Det er utført geofysiske målinger (SP ?) og endelig rapport blir utarbidet når måleresultatene foreligger.

Egge, A.; Dahl, T.; Holmsen , 1911
Enighedens grube i Forsand Ryfylke, Stavanger amt.
;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 1715;9 pages
Abstract:
Rapporten inneholder et brevkopi og fire utredninger som tilsammen gir en bred beskrivelse av forekomsten. Mineraliseringen består av kobber-, svovel og magnetkis som opptrer på en gjennomgående skifer i granitt. Geofysiske målinger (SP ?) viser at forekomsten er liten og den blir beskrevet som ikke drivbar.

Fieldsamples
Sample No. Sample type Miscellanrous
RO0066.01 Bedrock
Sampler :J.S. Sandstad/...Stored :Løkken
Comment :Semi-massive til moderat disseminerte bånd av magnetkis+pyritt+kobberkis i finkornet, tett mafisk bergart.
No. of registrated element analyses = 1
RO0066.02 Bedrock
Sampler :J.S. Sandstad/...Stored :Løkken
Comment :Moderat til kraftig pyritt-kobberkis disseminasjon i finkornet feltspat-amfibol-kvarts bergart/gabbro.
No. of registrated element analyses = 1
RO0066.05 Dump
Sampler :J.S. Sandstad/...Stored :Løkken
Comment :Moderat til kraftig pyritt/magnetkis+kobberkis disseminasjon i finkornet amfibol+kvarts bergart.
No. of registrated element analyses = 1
RO0066.06 Dump
Sampler :J.S. Sandstad/...Stored :Løkken
Comment :Massiv, finkornet magnetkis med litt kobberkis og få bergartsfragmenter.
No. of registrated element analyses = 1
RO0066.07 Dump
Sampler :J.S. Sandstad/...Stored :Løkken
Comment :Massiv, finkornet kobberkis-magnetkis malm, kobberkis nær biotittagrregater og bergartsfragmenter.
No. of registrated element analyses = 1
RO0066.08 Dump
Sampler :J.S. Sandstad/...Stored :Løkken
Comment :Årer og uregelmessige bånd med kobberkis i grågrønn silisifisert gabbro, Cu-rik.
No. of registrated element analyses = 1
RO0066.11 Dump
Sampler :P.M. Ihlen/...Stored :Løkken/...Size(kg) :2
Comment :Shear deformed pegmatite with Fe-sulfides+chalcopyrite aggregates
No. of registrated element analyses = 1
RO0066.12 Dump
Sampler :J.S. Sandstad/...Stored :Løkken/...Size(kg) :2
Comment :Weak chalcopyrite+galena dissemination and galena fractures in light gabbro with crosscutting calcite veinlets
No. of registrated element analyses = 1
RO0066.13 Dump
Sampler :P.M. Ihlen/...Stored :Løkken/...Size(kg) :2
Comment :Shear deformed amphibolite with dissemination and streaks of chalcopyrite
No. of registrated element analyses = 1
RO0066.14 Dump
Sampler :P.M. Ihlen/...Stored :Løkken/...Size(kg) :2
Comment :Fe-sulfides+chalcopyrite along the contact between amphibolite and pegmatite
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality : Lastebotn, nordre sjakt
(Object Id : 1129,002,01,00)
Location
County : Rogaland (11) Municipality : Forsand (1129)
Map 1:50000: Høle (1212-1) Map 1:250000: Mandal
Marking point: Longitude: 6.1224520 Latitude: 58.9361910
EU89-UTM Zone 32 (Coordinates IS confirmed)
X-coord: 334404 m. Y-coord: 6536510 m.
Commodity
Main Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Sub Type: Copper
Element(s): Cu Ni
Production
Activity: Mining Reserves:
Prod. method: Underground mining Production:
Prod. status: Disused, closed Volume of dump:


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

Mineralogy
Relationship Mineral Amount
Gangue mineral Amphibole Major mineral (>10%)
Gangue mineral Feldspar Major mineral (>10%)
Gangue mineral Quartz Subordinate mineral (1-10%)
Gangue mineral Apatite Subordinate mineral (1-10%)
Ore mineral Pyrrhotite Major mineral (>10%)
Ore mineral Chalcopyrite Major mineral (>10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Galena Subordinate mineral (1-10%)
Ore mineral Sphalerite Subordinate mineral (1-10%)

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

Information(s) in free text format
Free text
Denne nordligste lokaliteten i Lastebotn består av en 3 x 3 m sjakt hvor middelskornet gabbro dominerer. En mindre pegmatittgang (10-15 cm) med retning 206°760 finnes i tillegg. Den er tilnærmet parallell malmsonas orientering. Massiv malm er ikke påvist, moderat til svak disseminasjon og årer med kobberkis-magnetkis-pyritt finnes i finkornet mafisk grunnmasse (prøve .04). I tillegg er det svak sulfiddisseminasjon og større magnetitt-aggregater i pegmatitten (.03).

Fieldsamples
Sample No. Sample type Miscellanrous
RO0066.03 Bedrock
Sampler :J.S. Sandstad/...Stored :Løkken
Comment :Grovkornete magnetittaggregater i grovkornet.feltspat-kvarts pegmatitt.
No. of registrated element analyses = 1
RO0066.04 Bedrock
Sampler :J.S. Sandstad/...Stored :Løkken
Comment :Moderat disseminasjon av kobberkis-magnetkis/pyritt, dels stikk/årer i finkornet mørk grønnsvart bergart/gabbro.
No. of registrated element analyses = 1
RO0066.09 Bedrock
Sampler :J.S. Sandstad/...Stored :Løkken/...Size(kg) :2
Comment :Irregular lenses of pyrite+pyrrhotite+chalcopyrite in strongly deformee amphibolite, accessory molybdenite
No. of registrated element analyses = 1
RO0066.10 Dump
Sampler :P.M. Ihlen/...Stored :Løkken/...Size(kg) :2
Comment :Chalcopyrite veinlets/fractures in coarse grained dioritic hypersthen gneiss
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 1129 - 002 Lastebotn

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#
RO0066.01 Bedrock 738 214 9 149 446 .6 37.0
RO0066.02 Bedrock 2610 64 11 188 798 2.4 6.0
RO0066.03 Bedrock 21 127 48 4 12 .2 4.0
RO0066.04 Bedrock 17203 4797 5941 336 915 14.6 84.0
RO0066.05 Dump 3215 97 50 505 1515 2.5 15.0
RO0066.06 Dump 7471 193 79 548 4832 10.9 384.0
RO0066.07 Dump 26887 311 8 522 3013 26.9 388.0
RO0066.08 Dump 30245 176 40 143 584 40.5 114.0
RO0066.09 Bedrock 1137 251 213 123 560 .3 13.0
RO0066.10 Dump 6337 119 22 33 75 7.2 13.0
RO0066.11 Dump 5039 63 286 78 203 13.9 17.0
RO0066.12 Dump 5483 179 6388 14 16 8.6 7.0
RO0066.13 Dump 14198 254 88 54 386 17.0 19.0
RO0066.14 Dump 3461 208 28 145 647 2.7 101.0
------------------
Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* S%
RO0066.01 5.0 15.0 14 .5 109 5.00 2 8 3.84
RO0066.02 1.0 5.0 14 .6 15 38.00 2 7 7.04
RO0066.03 2.0 4.0 1 .5 24 14.00 4 4 .02
RO0066.04 1.0 11.0 24 21.1 6 187.00 17 7 9.76
RO0066.05 1.0 9.0 11 4.6 11 34.00 14 5 15.25
RO0066.06 2.0 49.0 12 7.0 55 41.00 21 9 17.98
RO0066.07 1.0 51.0 6 5.3 62 43.00 25 10 16.66
RO0066.08 1.0 16.0 3 .1 70 9.00 4 2 4.38
RO0066.09 4.0 -2.0 5 1.5 50 58.00 -3 7 4.05
RO0066.10 -2.0 -2.0 -2 -.2 114 1.00 -3 -3 .78
RO0066.11 9.0 5.0 11 -.2 52 27.00 -3 -3 2.30
RO0066.12 -2.0 -2.0 7 .6 18 2.00 3 -3 .12
RO0066.13 -2.0 3.0 4 .4 6 13.00 -3 6 1.22
RO0066.14 -2.0 5.0 4 1.6 18 3.00 -3 -3 5.27
------------------
Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*
RO0066.01 147 596 925 11.27 16.00 20.00 1 14.0 31.00
RO0066.02 115 1038 800 14.77 3.00 12.00 3 12.0 30.00
RO0066.03 8 28 300 4.31 51.00 4.00 1 21.0 349.00
RO0066.04 254 1115 1541 18.19 20.00 4.00 1 25.0 72.00
RO0066.05 111 742 821 24.48 31.00 4.00 1 20.0 33.00
RO0066.06 99 590 551 29.85 51.00 4.00 1 32.0 106.00
RO0066.07 87 377 518 27.90 23.00 4.00 1 26.0 66.00
RO0066.08 69 436 836 10.54 28.00 4.00 1 11.0 39.00
RO0066.09 535 868 1150 12.05 6.00 -8.00 -2 8.0 23.00
RO0066.10 51 94 591 5.29 -2.00 -8.00 2 17.0 8.00
RO0066.11 43 312 401 5.85 7.00 -8.00 -2 8.0 21.00
RO0066.12 28 13 954 3.24 20.00 82.00 4 16.0 13.00
RO0066.13 201 414 1598 9.34 4.00 -8.00 3 5.0 10.00
RO0066.14 66 293 654 11.02 5.00 -8.00 -2 8.0 11.00
------------------
Sample No. B*
RO0066.01 2
RO0066.02 2
RO0066.03 2
RO0066.04 3
RO0066.05 3
RO0066.06 2
RO0066.07 2
RO0066.08 5
RO0066.09 6
RO0066.10 3
RO0066.11 4
RO0066.12 4
RO0066.13 -3
RO0066.14 -3

The fact sheet was created on 20.01.2025
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