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|
Norsk versjon | ||||
| THE ORE DATABASE | |||||
| Deposit Area 1644 - 007 | |||||
| (Last updated 23.apr.2015) | |||||
Name of Deposit Area : Hessjø-Nygruva |
| (Object Id : 1644,007,00,00) |
| Location |
| County : | Sør-Trøndelag (16) | Municipality : | Holtålen (1644) |
| Map 1:50000: | Dalsbygda (1620-2) | Map 1:250000: | Røros |
| Marking point: | Longitude: | 11.1249630 | Latitude: | 62.6707100 |
| EU89-UTM Zone 32 | (Coordinates IS confirmed) |
| X-coord: | 608830 m. | Y-coord: | 6950694 m. |
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| Commodity |
| Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Zinc | |
| Element(s): | Kis Zn Cu Pb |
| Production |
| Activity: | Test mining | Reserves: | 3500 thousand tons | |
| Prod. method: | Open pit and underground mining | Production: | -1 thousand tons | |
| Prod. status: | Disused, closed | Volume of dump: | 200 m3 |
| Importance |
| Public: | Not Assessed (reg. 20.03.2017) |
| Economical: | Could be significant , (Confirmed 25.okt.2001 by Terje Bjerkgård) |
Products |
| Element/product | Crude ore grade or quality | |
| CU | ||
| KIS |
Operations |
| From - To | Activity | Comments | |
| 1830 - 1830 | Test mining | Company/Institution :Røros Kobberverk | |
| Drift på kobber | |||
| 1905 - 1905 | Test mining | Company/Institution :Røros Kobberverk | |
| Pyritt | |||
| 1948 - 1948 | Geophysics | Company/Institution :Geofysisk Malmleting | |
| Turam bakkemålinger | |||
| 1974 - 1974 | Core drilling | Company/Institution :AS Sydvaranger | |
| 3 hull over E-anomalien | |||
| 1974 - 1974 | Geophysics | Company/Institution :NGU | |
| Helikoptermålinger, EM | |||
| 1975 - 1976 | Geophysics | Company/Institution :NGU | |
| SP og VLF bakkemålinger |
Mineralization |
| Era: | Paleozoic | Period: | Ordovician | |
| Dating: | Method: | |||
| Genesis: | Volcex | Form: | Plate | |
| Main texture: | Banded | Min. distribution: | Massive (>50 % ore minerals) |
| Main grain size: | Fine grained (< 1 mm) | Main alteration: | Chloritisation |
| Strike/Dip: | 200 / 60 | Direction: | ||
| Plunge: |
| Stratigraphic classification of host rock |
| Era: | Paleozoic | Period: | Ordovician |
| Province: | Caledonides | |
| Geotec.unit: | Trondheim Nappe Complex | |
| Tectonic complex: | Meråkerdekket | |
| Igneous complex: |
| Group: | Fundsjø | Formation: |
Mineralogy |
| Relationship | Mineral | Amount | |
| Gangue mineral | Chlorite | Major mineral (>10%) | |
| Gangue mineral | Quartz | Major mineral (>10%) | |
| Gangue mineral | Amphibole | Accessory mineral (<1%) | |
| Ore mineral | Pyrite | Major mineral (>10%) | |
| Ore mineral | Chalcopyrite | Subordinate mineral (1-10%) | |
| Ore mineral | Sphalerite | Subordinate mineral (1-10%) | |
| Ore mineral | Pyrrhotite | Subordinate mineral (1-10%) |
Lithology: |
| Relationship | Rock | Origin | |
| Wall rock | Greenstone | Extrusive Original rock :Basalt |
|
| Metamorphic facies :Greenschist |
Structures |
| Location: | Type: | Orientation(360 gr.): | Relation to min.: | |
| Wall rock | Foliation | Strike/Dip :201 / 58 | Post-mineralisation ;...Effect :Modifies | |
| Wall rock | Fold axis | Dir./Plunge :257 / 54 | Post-mineralisation ;...Effect :Modifies |
Information(s) in free text format |
| Free text |
| The Nygruva mine consists of an excavation in a small hillside, and two minor shafts. The excavation is 3-4 m across strike towards the west, before in turns to the north and follows a 1 meter thick zone of massive, fine-grained diffusely banded pyrite ore with subordinate sphalerite. The ore zone wedges out in both directions along strike, but may continue downwards along the strongly defined lineation/fold axis. In the footwall are numerous bands and lenses of disseminated to semimassive pyrite in quartz. One sample from the dump contained 1.71% Cu and 3.01% Zn. The closest shaft is about 70 m to the north. Here are two thin zones (20 and 80 cm wide) of massive, banded pyrite mineralization. Two samples contained 1.32 and 1.43% Cu and 0.99 and 7.94% Zn, respectively. The second shaft is another 70 m to the north. Here a sample of massive pyrrhotite ore with subordinate chalcopyrite and pyrite contained 1.76% Cu and 0.81% Zn. In all the samples from the Nygruva mine, the contents of Pb, Ag and Au were extremely low (highest values were 24 ppm Pb, 4 ppm Ag and 0.1 ppm Au). Three holes were drilled in 1974, guided by a weak EM anomaly associated with the outcropping mineralization. Hole no. 301 intersected 0.25 m with 3.00% Cu and 0.50% Zn, while holes no.302 and 303 intersected only weak pyrite impregnation. |
Bibliography: |
| References not to be found in NGU's Reference Archive.: |
| Se under Hesjø gruve (ST0188) |
Fieldsamples |
| Sample No. | Sample type | Miscellanrous | ||||
| ST0196.01 | Dump |
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| ST0196.02 | Dump |
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| ST0196.03 | Dump |
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| ST0196.04 | Dump |
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| NB! All analyse values are shown at the end of the printout.: |
Name of Locality : Pit |
| (Object Id : 1644,007,01,00) |
| Location |
| County : | Sør-Trøndelag (16) | Municipality : | Holtålen (1644) |
| Map 1:50000: | Dalsbygda (1620-2) | Map 1:250000: | Røros |
| Marking point: | Longitude: | 11.1256640 | Latitude: | 62.6712050 |
| EU89-UTM Zone 32 | (Coordinates IS confirmed) |
| X-coord: | 608865 m. | Y-coord: | 6950751 m. |
|
|
| Commodity |
| Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Zinc | |
| Element(s): | Kis Zn Cu Pb |
Name of Locality : Pit |
| (Object Id : 1644,007,02,00) |
| Location |
| County : | Sør-Trøndelag (16) | Municipality : | Holtålen (1644) |
| Map 1:50000: | Dalsbygda (1620-2) | Map 1:250000: | Røros |
| Marking point: | Longitude: | 11.1263880 | Latitude: | 62.6717680 |
| EU89-UTM Zone 32 | (Coordinates IS confirmed) |
| X-coord: | 608900 m. | Y-coord: | 6950814 m. |
|
|
| Commodity |
| Main Type: | Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn) | Sub Type: | Zinc | |
| Element(s): | Kis Zn Cu Pb |
Analyse Results |
| from |
| Deposit Area 1644 - 007 Hessjø-Nygruva |
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# |
| ST0196.01 | Dump | 13155 | 9861 | 10 | 150 | 7 | 1.9 | 15.0 |
| ST0196.02 | Dump | 14294 | 79426 | 24 | 339 | 1 | -.3 | 36.0 |
| ST0196.03 | Dump | 17051 | 30145 | 20 | 161 | 9 | 4.2 | 102.0 |
| ST0196.04 | Dump | 17572 | 8088 | 9 | 365 | 12 | 4.2 | 75.0 |
| ------------------ |
| Sample No. | Pt# | Pd# | As* | Cd* | Ba* | Mo* | Sb* | Bi* | S% |
| ST0196.01 | 1.0 | -1.0 | 23 | 18.1 | 2 | 1.00 | 3 | 4 | 42.86 |
| ST0196.02 | 1.0 | 1.0 | 59 | 168.7 | 7 | 15.00 | -3 | -3 | 41.91 |
| ST0196.03 | -1.0 | 1.0 | 42 | 60.9 | 4 | 5.00 | -3 | 6 | 34.29 |
| ST0196.04 | 1.0 | -1.0 | 40 | 22.4 | 6 | -1.00 | -3 | 6 | 37.81 |
| ------------------ |
| Sample No. | V* | Cr* | Mn* | Fe% | Th* | U* | W* | Sr* | La* |
| ST0196.01 | 2 | -1 | 247 | 16.49 | -2.00 | -8.00 | 2 | 1.0 | -1.00 |
| ST0196.02 | 6 | -1 | 275 | 17.35 | -2.00 | -8.00 | 20 | 3.0 | -1.00 |
| ST0196.03 | 6 | -1 | 893 | 17.54 | -2.00 | -8.00 | -2 | 12.0 | 1.00 |
| ST0196.04 | 12 | 6 | 336 | 21.97 | -2.00 | -8.00 | -2 | 1.0 | -1.00 |
| ------------------ |
| Sample No. | B* | ||||||||
| ST0196.01 | -3 | ||||||||
| ST0196.02 | -3 | ||||||||
| ST0196.03 | -3 | ||||||||
| ST0196.04 | 3 |
| The fact sheet was created on 04.05.2024 |
| Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no |
| Copyright © 2024 Geological Survey of Norway |