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THE ORE DATABASE
Occurence 5045 - 004 Angeltjernhøgda
(Object Id: 161)
(Last updated: 15.05.2006)
Location
County: Trøndelag Municipality: Grong (5045)
Map 1:50000: Grong (1823-4) Map 1:250000: Grong
Coordinate system: EU89-UTM Zone 33
East: 384102 m. North: 7150959 m.
Longitude: 12.5899740 Latitude: 64.4643490
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Sulphides
Element(s): Kis
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
1970 - 1970 Geology Company/Institution :NGU
1980 - 1980 Geology Company/Institution :Grong Gruber A/S
1980 - 1980 Geophysics Company/Institution :Grong Gruber A/S
1996 - 1996 Sampling Company/Institution :NGU

Mineralization
Era: Paleozoic Period: Ordovician
Genesis: Volcex Form: Layer
Main texture: Banded Min. distribution: Semi-massive (20-50 % ore minerals)
Main grain size: Fine grained (< 1 mm) Main alteration: No country rock alteration
Strike/Dip: 236 / 60 Direction:
Plunge:
Stratigraphic classification of host rock
Era: Paleozoic Period: Ordovician
Province: Caledonides
Geotec.unit: Køli Nappe Complex
Tectonic complex: Gjersvik Nappe
Igneous complex:
Group: Gjersvik Formation:

Mineralogy
Relationship Mineral Amount
Gangue mineral Quartz Major mineral (>10%)
Gangue mineral Amphibole Subordinate mineral (1-10%)
Gangue mineral Plagioclase Subordinate mineral (1-10%)
Ore mineral Pyrite Major mineral (>10%)
Ore mineral Magnetite Subordinate mineral (1-10%)

Lithology:
Relationship Rock Origin
Host rock Garbenschist Sedimentary
Original rock :Tuffite
Metamorphic facies :Greenschist
Wall rock Greenschist Sedimentary
Original rock :Tuffite
Metamorphic facies :Greenschist

Structures
Location: Type: Orientation(360 gr.): Relation to min.:
Host rock Foliation Strike/Dip :236 / 60 Post-mineralisation ;...Effect :Modifies
Host rock Schistosity Strike/Dip :250 / 75 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format
Free text
Mineraliseringen er blottet ved en bekk 400 m og 200 m vestsørvest for Angeltjønnin, og kan nåes fra skogsbilvei fra Stortjønna i sør. Det er skutt litt i en 70 cm høy skjæring på nordsida av bekken. Smale (1-15 mm) semimassive bånd med svovelkis opptrer i et 50-60 cm tykt lag i hornblendeskifer med utvikla garbentekstur. I den mineraliserte sonen finnes også linser med magnetitt og chert og felsiske begarter. Basemetallinnholdet er lavt i denne sonen. Mineraliseringen er antatt å opptre på et lavere stratigrafisk nivå enn forekomstene Godejord og Finnbu, innen den grønnsteinsdominerte delen av Limingengruppen. 100 m sør for Angeltjønnin er det påvist en ny svak leder som Grong Gruber A/S røsket på i 1980 (Angeltjern sør). Kvartsførende svovelkisrike bånd (10-25 mm) i hornblendeskifer ble påvist. Strøkretningen til mineraliseringen er 252/70. Analyser viser 0,99 % og 1,40 % Cu med mindre enn 0,1 % Pb og Zn (Olesen 1980). Denne røsk er gjenrast og mineraliseringen ble ikke påvist ved befaring i 1996.

Bibliography:
From NGU's Reference Archive:
Oftedahl, Christoffer , 1958
Oversikt over Grongfeltets skjerp og malmforekomster.
;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.202;1-75 + fo pages
Abstract:
Ore occurences of the Grong area: In the period 1910-1918 a great number of ore occurences were discovered in the Grong area. The late state geologist Steinar Foslie mapped the area in the years 1922-1931. Foslie also mapped all claims and occurences and made special field investigations in a few cases. This book presents a survey of all occurences chiefly based on the field observations of Foslie. In addition the present author has done some field work in connection with the three large deposits, Joma, Skorovass, and Gjersvik. The map, Plate 1, shows the areal geology and the location of the occurrences, numbered from 1 to 131. the ore of the occurrences is chiefly pyrite. The larger occurrences also contain some chalcopyrite and sphalerite etc. and the smaller occurrences contain ither pure pyrite with some magnetite. The Joma deposit (No. 1), contains about 15.5 mill. tons of ore. The ore zone forms an arc and is situated within a thick series of greenstones (Fig. 1). The Skorovass mine (No. 2), contains about 7,5 mill. tons of ore. The deposit is situated in a greenstone complex (Fig. 7), and is immediately surrounded by asid tuffs of quartz keratophyric composition (Table 1).

Olesen, Odleiv , 1980
Oppfølging av områder med malmpotensial i Grongfeltet.
;NTH Bergavd.;AVHANDLING

Fieldsamples
Sample No. Sample type Miscellanrous
NT0163.01 Bedrock
Sampler: Sandstad, J.S./...Size(kg): 2
Comment: Pyrite-bands (2-10mm), fine grained, in dark green hornblende schist with felsic lenses
No. of registrated element analyses = 1
1155 Bedrock
No. of registrated element analyses = 1
1156 Bedrock
No. of registrated element analyses = 1
1157 Bedrock
No. of registrated element analyses = 1
1158 Bedrock
No. of registrated element analyses = 1
1159 Bedrock
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Skjerp 1
(Object Id: 547 4,01,00)
Location
County: Trøndelag Municipality: Grong (5045)
Map 1:50000: Grong (1823-4) Map 1:250000: Grong
Coordinate system: EU89-UTM Zone 33
East: 384256 m. North: 7150959 m.
Longitude: 12.5931930 Latitude: 64.4644020
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Sulphides
Element(s): Kis
Resources and production
Activity: Pitting Reserves:
Operating method: Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
NT0163.02 Bedrock
Sampler: Sandstad, J.S./...Size(kg): 2
Comment: Pyrite-bands (5-10mm), semi-massive in garben schist with felsic and fine grained magnetite lenses
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Name of Locality: Angeltjern sør
(Object Id: 6955 4,02,00)
Location
County: Trøndelag Municipality: Grong (5045)
Map 1:50000: Grong (1823-4) Map 1:250000: Grong
Coordinate system: EU89-UTM Zone 33
East: 384801 m. North: 7150899 m.
Longitude: 12.6045610 Latitude: 64.4640490
Show on map
Resource
Resource Type: Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) Resource Subtype: Sulphides
Element(s): Kis
Resources and production
Activity: Exploration Reserves:
Operating method: Historical production:


Fieldsamples
Sample No. Sample type Miscellanrous
JS96011 Bedrock
Sampler: Sandstad, J.S./...Stored: Løkken
Comment: Sulphide veinlets, py+sl+cpy, in silicified greenstone
No. of registrated element analyses = 1
NB! All analyse values are shown at the end of the printout.:

Analyse Results
from
Deposit Area 5045 - 004 Angeltjernhøgda

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#
JS96011 Bedrock 920 9621 19 53 39 .8 22.0
NT0163.01 Bedrock 14 96 -3 153 17 -.3 10.0
NT0163.02 Bedrock 113 53 5 217 121 -.3 18.0
1155 Bedrock 84 306 7 71 4 .3 13.0
1156 Bedrock 34 22 2 152 4 .3 13.0
1157 Bedrock 71 27 2 110 5 .3 9.0
1158 Bedrock 107 35 2 111 3 .3 9.0
1159 Bedrock 54 38 3 79 5 .3 14.0
------------------
Sample No. Pt# Pd# Rh# As* Cd* Ba* Mo* Sb* Bi*
JS96011 1.0 3.0 3.0 9 54.2 4 4.00 -2 -2
NT0163.01 -1.0 3.0 3.0 10 1.2 4 25.00 -2 -2
NT0163.02 -1.0 -1.0 -1.0 18 1.0 28 44.00 -2 -2
1155 1.0 2.0 28 .2 2 19.00 2 4
1156 2.0 2.0 20 .2 2 58.00 2 8
1157 1.0 2.0 33 .4 2 37.00 2 6
1158 3.0 2.0 35 .2 2 21.00 2 3
1159 1.0 2.0 31 .2 2 46.00 2 5
------------------
Sample No. S% V* Cr* Mn* Fe% Th* U* W* Sr*
JS96011 .78 45 61 4562 3.77 7.00 -5.00 -2 91.0
NT0163.01 3.33 198 41 610 16.03 -2.00 -5.00 -2 12.0
NT0163.02 5.27 303 192 1949 24.34 -2.00 -5.00 2 5.0
1155 35.72 2 1 29 20.85 2.00 5.00 1 1.0
1156 35.08 48 2 109 23.38 2.00 7.00 1 1.0
1157 39.37 22 3 157 21.36 2.00 5.00 1 1.0
1158 33.41 13 1 98 21.15 2.00 5.00 1 1.0
1159 34.37 17 4 164 21.99 2.00 5.00 1 2.0
------------------
Sample No. La* B*
JS96011 -1.00 -3
NT0163.01 1.00 -3
NT0163.02 3.00 5
1155 2.00 2
1156 2.00 2
1157 2.00 2
1158 2.00 2
1159 2.00 2

The fact sheet was created on 04.05.2024
Questions or comments regarding the fact sheet can be emailed to:
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