Norsk versjon | |||||
THE ORE DATABASE | |||||
Deposit Area 1739 - 020 | |||||
(Last updated 16.mai.2006) |
Name of Deposit Area : Langtjønna |
(Object Id : 1739,020,00,00) |
Location |
County : | Nord-Trøndelag (17) | Municipality : | Røyrvik (1739) |
Map 1:50000: | Skorovatn (1824-2) | Map 1:250000: | Grong |
Marking point: | Longitude: | 13.1656540 | Latitude: | 64.6141200 |
EU89-UTM Zone 33 | (Coordinates IS confirmed) |
X-coord: | 412262 m. | Y-coord: | 7166719 m. |
|
Commodity |
Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Sulphides | |
Element(s): | Kis |
Production |
Activity: | Pitting | Reserves: | ||
Prod. method: | Production: | |||
Prod. status: | Volume of dump: | 4 m3 |
Importance |
Public: | Little Importance (reg. 18.02.2015) |
Economical: | Minor interest |
Operations |
From - To | Activity | Comments | |
1971 - 1977 | Geology | Company/Institution :Elkem A/S | |
1981 - 1982 | Geophysics | Company/Institution :Elkem A/S | |
1982 - 1982 | Pitting | Company/Institution :Elkem A/S | |
1991 - 1991 | Sampling | Company/Institution :NGU | |
1995 - 1995 | Sampling | Company/Institution :NGU |
Mineralization |
Era: | Paleozoic | Period: | Ordovician | |
Dating: | Method: | |||
Genesis: | Volcex | Form: | Irregular | |
Main texture: | Structureless | Min. distribution: | Disseminated (<20 % ore minerals) |
Main grain size: | Fine grained (< 1 mm) | Main alteration: | Sericitisation |
Strike/Dip: | 80 / 50 | 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 | Chlorite | Subordinate mineral (1-10%) | |
Ore mineral | Pyrrhotite | Major mineral (>10%) | |
Ore mineral | Pyrite | Major mineral (>10%) | |
Ore mineral | Magnetite | Subordinate mineral (1-10%) | |
Ore mineral | Chalcopyrite | Accessory mineral (<1%) |
Lithology: |
Relationship | Rock | Origin | |
Wall rock | Quartz keratophyre | Extrusive Original rock :Rhyodacite |
|
Metamorphic facies :Greenschist | |||
Wall rock | Greenstone | Extrusive Original rock :Basalt |
|
Metamorphic facies :Greenschist |
Structures |
Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
Wall rock | Foliation | Strike/Dip :66 / 30 | Post-mineralisation ;...Effect :Modifies | |
Wall rock | Mineral banding | Strike/Dip :270 / 65 | Post-mineralisation ;...Effect :Modifies |
Information(s) in free text format |
Free text |
Forekomsten ligger ca. 3 km SSØ for Skorovas, 5-600 m sør for Langtjern. Hovedskjerpet ligger ved et lite tjern ved kote 660 og består av en 8 m lang røsk som er orientert nord-sør. Langtjønna-feltet ligger på grensen mellom en putelava i syd og en mørk, klorittrik grønnstein i nord. I begge disse opptrer ekshalittiske horisonter med lyse og mørke chert-lag og sure vulkanitter. Mineraliseringene ligger i en ca. 400 m lang rustsone. Denne er knyttet til sure vulkanitter i et miljø som forøvrig består av grønnstein, chert og agglomerat. Lagserien har rett veg opp. Sulfider som er funnet er finkornet magnetkis og svovelkis og enkelte kobberkiskorn. Det er antydet at rustsonen kan representere en feedersone, med mineralisering og hydrotermal omvandling, serisittisering og silifisering. Miljøet har mange fellestrekk med det en finner rundt Skorovas-malmen. Massive sulfidlag er opptil 0.5 m mektige og magnetittbenker som er 10-40 cm mektige finnes også. |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
JS95177 | Bedrock |
|
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LS91178 | Bedrock |
|
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LS91179 | Bedrock |
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LS91180 | Bedrock |
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NB! All analyse values are shown at the end of the printout.: |
Name of Sample point : Langtjønna |
(Object Id : 1739,020,00,01) |
Location |
County : | Nord-Trøndelag (17) | Municipality : | Røyrvik (1739) |
Map 1:50000: | Skorovatn (1824-2) | Map 1:250000: | Grong |
Marking point: | Longitude: | 13.1644010 | Latitude: | 64.6141050 |
EU89-UTM Zone 33 | (Coordinates IS confirmed) |
X-coord: | 412202 m. | Y-coord: | 7166719 m. |
|
Commodity |
Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Sulphides | |
Element(s): | Kis |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
JS95173 | Bedrock |
|
||||
JS95174 | Bedrock |
|
NB! All analyse values are shown at the end of the printout.: |
Name of Sample point : Langtjønna |
(Object Id : 1739,020,00,02) |
Location |
County : | Nord-Trøndelag (17) | Municipality : | Røyrvik (1739) |
Map 1:50000: | Skorovatn (1824-2) | Map 1:250000: | Grong |
Marking point: | Longitude: | 13.1645610 | Latitude: | 64.6148250 |
EU89-UTM Zone 33 | (Coordinates IS confirmed) |
X-coord: | 412212 m. | Y-coord: | 7166799 m. |
|
Commodity |
Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Sulphides | |
Element(s): | Kis |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
JS95179 | Bedrock |
|
NB! All analyse values are shown at the end of the printout.: |
Name of Sample point : Langtjønna |
(Object Id : 1739,020,00,03) |
Location |
County : | Nord-Trøndelag (17) | Municipality : | Røyrvik (1739) |
Map 1:50000: | Skorovatn (1824-2) | Map 1:250000: | Grong |
Marking point: | Longitude: | 13.1634360 | Latitude: | 64.6144520 |
EU89-UTM Zone 33 | (Coordinates IS confirmed) |
X-coord: | 412157 m. | Y-coord: | 7166759 m. |
|
Commodity |
Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Sulphides | |
Element(s): | Kis |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
JS95175 | Bedrock |
|
NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
from |
Deposit Area 1739 - 020 Langtjønna |
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# |
JS95173 | Bedrock | 163 | 438 | 65 | -1 | 29 | 1.4 | 94.0 |
JS95174 | Bedrock | 83 | 112 | 24 | -1 | 26 | 1.1 | 16.0 |
JS95175 | Bedrock | 7 | 5 | 6 | 1 | 5 | -.3 | 7.0 |
JS95177 | Bedrock | 224 | 634 | 59 | 17 | 72 | .8 | 11.0 |
JS95179 | Bedrock | 6 | 5 | 3 | 1 | 8 | -.3 | -2.0 |
LS91178 | Bedrock | 311 | 625 | 68 | 25 | 61 | .6 | 16.0 |
LS91179 | Bedrock | 214 | 326 | 60 | 14 | 45 | 2.8 | 72.0 |
LS91180 | Bedrock | 91 | 38 | 5 | 4 | 16 | .1 | 12.0 |
------------------ |
Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sb* | Bi* | S% |
JS95173 | -3.0 | 3.0 | 924 | 1.4 | 1 | 3.00 | 3 | -2 | 36.20 |
JS95174 | -3.0 | -3.0 | 49 | .3 | 27 | 7.00 | -2 | -2 | 2.38 |
JS95175 | -3.0 | -3.0 | 14 | -.2 | 35 | 1.00 | 2 | 2 | 1.43 |
JS95177 | -3.0 | -3.0 | 1038 | 1.1 | 5 | 5.00 | 2 | -2 | 30.10 |
JS95179 | -3.0 | -3.0 | 5 | -.2 | 2 | 1.00 | 3 | 2 | .16 |
LS91178 | 1.0 | 6.0 | 1721 | 2.5 | 3 | 1.00 | 6 | 2 | 29.10 |
LS91179 | 1.0 | 9.0 | 885 | 2.4 | 3 | 5.00 | 5 | 2 | 26.20 |
LS91180 | 3.0 | 7.0 | 390 | .2 | 4 | 2.00 | 2 | 2 | 2.60 |
------------------ |
Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
JS95173 | 67 | 11 | 875 | 21.37 | -2.00 | -5.00 | -2 | 1.0 | 1.00 |
JS95174 | 109 | 21 | 2265 | 34.94 | 2.00 | -5.00 | -2 | 61.0 | 15.00 |
JS95175 | 2 | 3 | 45 | 3.19 | -2.00 | -5.00 | -2 | 3.0 | 4.00 |
JS95177 | 46 | 8 | 641 | 39.00 | 2.00 | -5.00 | -2 | 4.0 | 3.00 |
JS95179 | 1 | 5 | 57 | .71 | -2.00 | -5.00 | -2 | 2.0 | 2.00 |
LS91178 | 44 | 12 | 879 | 38.61 | 1.00 | 8.00 | 1 | 3.0 | 2.00 |
LS91179 | 71 | 39 | 1229 | 29.24 | 1.00 | 6.00 | 1 | 8.0 | 3.00 |
LS91180 | 16 | 15 | 156 | 4.58 | 1.00 | 5.00 | 1 | 4.0 | 3.00 |
------------------ |
Sample No. | B* | ||||||||
JS95173 | -3 | ||||||||
JS95174 | -3 | ||||||||
JS95175 | -3 | ||||||||
JS95177 | -3 | ||||||||
JS95179 | -3 | ||||||||
LS91178 | 6 | ||||||||
LS91179 | 2 | ||||||||
LS91180 | 2 |
The fact sheet was created on 19.05.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
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