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	THE ???? DATABASE
	Occurence 0 - 000 FEIL
	(Object Id: ) (Last updated: 23.04.2015)

Products

	Element/product	Crude ore grade or quality	Reg. date
	Cu		28.11.1997
	Kis		28.11.1997

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
	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	Sampler: Terje Bjerkgård/...Stored: Løkken/...Size(kg): 5 Comment: Banded, fine-grained, massive pyrite in quartz matrix. Frequent black spots of amphibole. No. of registrated element analyses = 1
	ST0196.02	Dump	Sampler: Terje Bjerkgård/...Stored: Løkken/...Size(kg): 5 Comment: Banded, fine-grained sphalerite with minor chalcopyrite in quartz matrix. No. of registrated element analyses = 1
	ST0196.03	Dump	Sampler: Terje Bjerkgård/...Stored: Løkken/...Size(kg): 5 Comment: Massive, fine-grained pyrite-sphalerite ore. No. of registrated element analyses = 1
	ST0196.04	Dump	Sampler: Terje Bjerkgård/...Stored: Løkken/...Size(kg): 5 Comment: Massive pyrrhotite-chalcopyrite with scattered mm-sized pyrite cubes. Non-sulfides include quartz and amphibole. No. of registrated element analyses = 1

NB! All analyse values are shown at the end of the printout.:

Name of Locality: Pit

(Object Id: 32686 7,01,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Dalsbygda (1620-2)

Map 1:250000:

Røros

County:

UTM-Zone 33 - EUREF89/WGS84

Resource

	Resource Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Resource Subtype:	Zinc
			Element(s):	Kis Zn Cu Pb

Name of Locality: Pit

(Object Id: 32687 7,02,00)

Location

County:

Municipality:

Mangler ()

Map 1:50000:

Dalsbygda (1620-2)

Map 1:250000:

Røros

County:

UTM-Zone 33 - EUREF89/WGS84

Resource

	Resource Type:	Base metals (Cu,Zn,Pb,Fe sulphides, As,Sb,Bi,Sn)	Resource Subtype:	Zinc
			Element(s):	Kis Zn Cu Pb

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The fact sheet was created on 19.04.2024

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