Norsk versjon | |||||
THE ORE DATABASE | |||||
Occurence 5056 - 003 Mørkdalen | |||||
(Object Id: 4323) (Last updated: 14.12.2021) |
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Location |
County: | Trøndelag | Municipality: | Hitra (5056) |
Map 1:50000: | Sør-Frøya (1422-3) | Map 1:250000: | Kristiansund |
Coordinate system: | EU89-UTM Zone 32 |
East: | 485012 m. | North: | 7053864 m. |
Longitude: | 8.6977520 | Latitude: | 63.6124500 |
Show on map |
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Resource |
Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Lead | |
Element(s): | Pb Zn |
Importance |
Raw material meaning: | Little Importance (reg. 18.02.2015) |
Resources and production |
Activity: | Test mining | Reserves: | ||
Operating method: | Underground mining | Historical production: |
Operations |
From - To | Activity | Comments | |
1983 - 1984 | Detail mapping | Company/Institution :Sulfidmalm A/S | |
1993 - 1993 | Sampling | Company/Institution :NGU |
Mineralization |
Era: | Paleozoic | Period: | Ordovician | |
Genesis: | Replacement/Metasomatism | Form: | Irregular | |
Main texture: | Durchbewegt | Min. distribution: | Disseminated (<20 % ore minerals) |
Main grain size: | Medium grained (1-3 mm) | Main alteration: | Skarn formation |
Strike/Dip: | Direction: | |||
Plunge: |
Stratigraphic classification of host rock |
Era: | Paleozoic | Period: |
Province: | Caledonides | |
Geotec.unit: | Helgeland Nappe Complex | |
Tectonic complex: | ||
Igneous complex: |
Group: | Formation: |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Calcite | Major mineral (>10%) | |
Gangue mineral | Pyroxene | Subordinate mineral (1-10%) | |
Gangue mineral | Dolomite | Subordinate mineral (1-10%) | |
Ore mineral | Galena | Major mineral (>10%) | |
Ore mineral | Sphalerite | Major mineral (>10%) | |
Ore mineral | Chalcopyrite | Subordinate mineral (1-10%) | |
Ore mineral | Freibergite | Accessory mineral (<1%) |
Lithology: |
Relationship | Rock | Origin | |
Host rock | Calcite marble | Sedimentary Original rock :Limestone |
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Metamorphic facies :Amphibolite | |||
Wall rock | Granodiorite | Intrusive Original rock :Granodiorite |
Information(s) in free text format |
Free text |
Forekomsten ligger vel 2 km vest for Melandsgruvene og ca. 350 m vest for veien mellom Melandsjø og Asmundvåg. Husmo (1984) antar at det går større forkastning/skyvesone gjennom Mørkdalen og videre østover gjennom Storvatnet. En synk med åpning på 3x4 m er drevet inn i en kalkspatmarmor på toppen av en bratt skråning på nordsida av dalen i et område som generelt er dårlig blottet. I nord grenser marmoren med en mulig tektonisk kontakt til en sterkt deformert, grønnlig granitt/granodioritt. Marmoren er 4-12 m mektig, urein og rødbrunvitrende og fører uregelmessige kalkspatårer. Sulfidmineraliseringene består i hovedsak av blyglans og rødbrun sinkblende i aggregater/flekker som er 1-5 mm store, og i sprekkefyllinger i fin- til middelskornet, gulhvit og dels grønnlig marmor. Mindre mengder kobberkis finnes i egne årer. |
Bibliography: |
References not to be found in NGU's Reference Archive.: |
Husmo, T. 1984: Geologi og bly-sink-mineralisering på Nord-Hitra. I Sivertsen, R. m.fl. Geologi og bly-sink-mineralisering på Nord-Hitra. BV Rapport 1370, 148s. |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
ST0120.01 | Dump |
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ST0120.02 | Dump |
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NB! All analyse values are shown at the end of the printout.: |
Name of Locality: Mørkdalen øst |
(Object Id: 6660 3,01,00) |
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Location |
County: | Trøndelag | Municipality: | Hitra (5056) |
Map 1:50000: | Hitra (1422-2) | Map 1:250000: | Kristiansund |
Coordinate system: | EU89-UTM Zone 32 |
East: | 485207 m. | North: | 7053789 m. |
Longitude: | 8.7016910 | Latitude: | 63.6117850 |
Show on map |
|
Resource |
Resource Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Resource Subtype: | Lead | |
Element(s): | Pb Zn |
Resources and production |
Activity: | Pitting | Reserves: | ||
Operating method: | Historical production: |
Mineralogy |
Relationship | Mineral | Amount | |
Gangue mineral | Calcite | Major mineral (>10%) | |
Gangue mineral | Pyroxene | Subordinate mineral (1-10%) | |
Ore mineral | Galena | Major mineral (>10%) | |
Ore mineral | Sphalerite | Major mineral (>10%) | |
Ore mineral | Chalcopyrite | Subordinate mineral (1-10%) |
Information(s) in free text format |
Free text |
Mørkdalen øst ligger ca. 200 m øst for Mørkdalen vest og er et mindre skjerp i bunnen av den samme brattskråningen. Skjerpet ligger i en 3-4 m mektig, urein marmor og blyglans, sinkblende og mindre mengder kobberkis i hovedsak langs sprekker og årer og mindre som aggregater i skarnomvandlet marmor. |
Fieldsamples |
Sample No. | Sample type | Miscellanrous | ||||
ST0120.03 | Dump |
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NB! All analyse values are shown at the end of the printout.: |
Analyse Results |
from |
Deposit Area 5056 - 003 Mørkdalen |
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# |
ST0120.01 | Dump | 120 | 3813 | 4059 | 10 | 23 | 16.7 | 3.0 |
ST0120.02 | Dump | 4753 | 7469 | 10000 | 9 | 18 | 50.0 | 288.0 |
ST0120.03 | Dump | 175 | 10486 | 7798 | 11 | 22 | 16.4 | 5.0 |
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Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sn* | Sb* | Bi* |
ST0120.01 | -5.0 | -1.0 | -5 | 21.5 | 28 | 7.00 | -20 | 9 | 14 |
ST0120.02 | -5.0 | -1.0 | -5 | 50.9 | 28 | 10.00 | -20 | 244 | -5 |
ST0120.03 | -5.0 | -1.0 | -5 | 88.4 | 37 | 14.00 | -20 | 11 | 19 |
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Sample No. | V* | Cr* | Mn* | Fe% | W* | Sr* | La* | Na* | Mg* |
ST0120.01 | 23 | 124 | 1392 | 5.64 | -20 | 405.0 | 1.00 | 0 | 2 |
ST0120.02 | 20 | 155 | 1204 | 5.51 | -20 | 347.0 | 1.00 | 0 | 2 |
ST0120.03 | 24 | 155 | 1307 | 5.25 | -20 | 265.0 | 2.00 | 0 | 2 |
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Sample No. | Al* | K * | Ca* | Te* | |||||
ST0120.01 | 0 | 0 | 9 | -10.00 | |||||
ST0120.02 | 0 | 0 | 8 | -10.00 | |||||
ST0120.03 | 0 | 0 | 7 | -10.00 |
The fact sheet was created on 05.05.2024 |
Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
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