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	THE ORE DATABASE
	Occurence 5026 - 020 Litlrena
	(Object Id: 4413) (Last updated: 07.11.2023)

Operations

	From - To	Activity	Comments
	1883 - 1883	Test mining
	1997 - 1997	Sampling	Company/Institution :NGU

Mineralization

	Era:	Paleozoic	Period:	Ordovician
	Genesis:	Volcex	Form:
	Main texture:	Banded	Min. distribution:	Massive (>50 % ore minerals)

Main grain size:

Very unevenly grained

Main alteration:

Chloritisation

	Strike/Dip:		Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Ordovician

	Province:	Caledonides
	Geotec.unit:	Trondheim Nappe Complex
	Tectonic complex:	Meråker Nappe
	Igneous complex:

Group:

Fundsjø

Formation:

Hersjø

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Chlorite	Major mineral (>10%)
	Gangue mineral	Amphibole	Major mineral (>10%)
	Gangue mineral	Quartz	Subordinate mineral (1-10%)
	Gangue mineral	Feldspar	Subordinate mineral (1-10%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Magnetite	Major mineral (>10%)

Lithology:

	Relationship	Rock	Origin
	Wall rock	Amphibolite	Extrusive Original rock :Basalt
			Metamorphic facies :Amphibolite

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Schistosity	Strike/Dip :220 / 30	Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Forekomsten ligger i gran- og bjørkeskog nord for utmark og på sørsida av elva Litjrena, ca. 300 m for dens sammenløp med Storbekken. Finkornet amfibolitt er blottet ved elva og klorittrik skifer finnes i den ene av to vannfyllte groper. Den største av disse er trolig en skråsynk. Det er imidlertid svært lite malmgeologi å se i området utenom på de relativt store tippene som har samlet volum på omtrent 250 m3. Den dominerende malmtypen består av semi-massiv magnetkis med tynne striper/årer av kobberkis. Magnetkis-kobberkis brekjsemalm med amfibol-klorittrike fragmenter og svært finkornet magnetkis finnes også. Sidebergarten på tippen er i hovedsak finkornet amfibolitt og i mindre mengder klorittskifer og gabbro. I følge Aasgaard (1927) skal det også være påvist en 15 cm mektig sone med arsenkis ved denne forekomsten, men arsenkis ble ikke funnet ved befaringen. To prøver er imidlertid anriket på gull (opptil 3,8 g/t Au).

Photo(s) from the Deposit area:

Photo no. 1 showing Litlrena gruve" Photo no. 2 showing Litlrena gruve"

Bibliography:

From NGU's Reference Archive:

Aasgaard, Gunnar , 1927

	Gruber og skjerp i kisdraget Øvre Guldal-Tydal.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU; No.129;1-196 pages

Abstract:

The occurences described in this paper form a connection between th mining districts around Røros to the south and those around Meråker to the north. The occurences lie in mountain regions partly above the forest line. The list on page 12 contains the names of all known occurrences of whatever size within the district considered. Pl. I is a geological outline map of the district, compiled from maps in the Norwegian Geological Survey. In a geological summary on pages 18-27 it is shown that no pyrite occurrences of economic importance so far have been found in an eastern zone along the Swedish boundary where the rocks consist of hard schist with sparagmites, and igneous rocks. Neither have such occurrences been found in a zone of "Stuedalsskifer" and an other zone of "Gulaskifer" towards west, both indicated on the map. The occurrences of pyrite are chiefly found in connection with fine grained, light green or gravish, partly feldspar bearing schist and in connection with green schists, mostly fine grained hornblende schists. All these zones of schist gnereally strike north and dip west. The pyrite bearing schist lie on both sildes of a large zone of igneous rocks extending from Kjølifjell in the south over Hyllingen and Melshogna to Fangen in the Meråker district in the north.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	ST0211.01	Dump	Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2 Comment: po-cpy malm, semi-massiv/fint båndet, cpy striper, grønn matriks. No. of registrated element analyses = 1
	ST0211.02	Dump	Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2 Comment: mt-cpy-po malm, massiv, finkornet, po-cpy aggregater. No. of registrated element analyses = 1
	ST0211.03	Dump	Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2 Comment: mt+cpy, massiv, finkornet, dels båndet, få cpy striper/laminer. No. of registrated element analyses = 1
	ST0211.04	Dump	Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2 Comment: mt-cpy-po malm, finkornet breksjemalm, cpy strenger, amfibolfragmenter. No. of registrated element analyses = 1
	400024	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	400026	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	400029	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1

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

Name of Locality: Litlrena skjerp

(Object Id: 10005 20,01,00)

Location

County:

Trøndelag

Municipality:

Holtålen (5026)

Map 1:50000:

Ålen (1720-4)

Map 1:250000:

Røros

Coordinate system:

EU89-UTM Zone 32

East:

618155 m.

North:

6971467 m.

Longitude:

11.3214540

Latitude:

62.8541310

Show on map

Resource

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

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	ST0211.05	Dump	Sampler: Sandstad, J.S./...Stored: Løkken/...Size(kg): 2 Comment: po+cpy min., massiv-semi-massiv, få cpy strenger/aggregater. No. of registrated element analyses = 1

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

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Analyse Results

from

Deposit Area 5026 - 020 Litlrena

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#
ST0211.01	Dump	17001	2	-3	339	307	2.1	59.0
ST0211.02	Dump	14041	73	-3	49	19	3.8	3827.0
ST0211.03	Dump	876	14	-3	17	10	.3	57.0
ST0211.04	Dump	14672	45	-3	238	103	2.6	1737.0
ST0211.05	Dump	3249	5	4	224	216	.5	37.0
400024	Dump	6893	626	18	197	166	1.3	75.0
400026	Dump	29900	236	13	363	145	6.0	548.0
400029	Dump	19600	99	1	468	423	2.5	37.0

------------------

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
ST0211.01	3.0	3.0	-2	-.2	2	-1.00	-3	3	16.31
ST0211.02	1.0	-1.0	-2	-.2	63	-1.00	-3	-3	2.16
ST0211.03	1.0	-1.0	-2	-.2	4	-1.00	-3	-3	.30
ST0211.04	3.0	1.0	2	-.2	8	1.00	3	-3	7.19
ST0211.05	8.0	1.0	73	-.2	15	-1.00	-3	7	26.39
400024			30	2.1	6	2.00	3	3
400026			18	1.2	2	0.50	3	3
400029			17	.1	2	0.50	3	3

------------------

Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
ST0211.01	1	6	252	26.89	3.00	-8.00	-2	28.0	1.00
ST0211.02	32	10	414	40.43	5.00	-8.00	-2	41.0	10.00
ST0211.03	15	27	238	35.11	4.00	-8.00	-2	20.0	1.00
ST0211.04	7	11	164	38.53	4.00	-8.00	-2	6.0	-1.00
ST0211.05	14	47	141	33.26	5.00	-8.00	-2	4.0	17.00
400024	22	98	307	10.00				8.0	5.00
400026	7	26	321	10.00				22.0	28.00
400029	8	26	31	10.00				0.5	0.50

------------------

Sample No.	B*	Ti*
ST0211.01	-3
ST0211.02	-3
ST0211.03	-3
ST0211.04	-3
ST0211.05	-3
400024		180
400026		60
400029		30

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The fact sheet was created on 26.04.2024

Questions or comments regarding the fact sheet can be emailed to: ressursdatabaser@ngu.no

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