Norsk versjon
	THE ORE DATABASE
	Occurence 5026 - 026 Svenskmenna
	(Object Id: 4419) (Last updated: 07.11.2023)

Products

	Element/product	Crude ore grade or quality	Reg. date
	Cu	1.37 %	22.11.1994
	S	42.46 %	22.11.1994
	Zn	1.80 %	22.11.1994

Operations

	From - To	Activity	Comments
	1870 - 1880	Pitting
	1882 - 1884	Regular production	Company/Institution :Os-Hommelvikselskapet
	1912 - 1914	Test mining	Company/Institution :Verstraete & fils
	1915 - 1918	Regular production	Company/Institution :A. Huitfeldt & Co.

Mineralization

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

Main grain size:

Very unevenly grained

Main alteration:

Chloritisation

	Strike/Dip:	170 / 10	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Paleozoic

Period:

Cambrian

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

Group:

Aursund

Formation:

Røsjø

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Chlorite	Major mineral (>10%)
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Garnet	Accessory mineral (<1%)
	Ore mineral	Pyrrhotite	Major mineral (>10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Subordinate mineral (1-10%)
	Ore mineral	Magnetite	Accessory mineral (<1%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Klorittskifer	Sedimentary Original rock :Argillaceous sediment
			Metamorphic facies :Greenschist
	Wall rock	Sparagmittisk sk.	Sedimentary Original rock :Greywacke
			Metamorphic facies :Greenschist
	Wall rock	Kvartsglimmerskifer	Sedimentary Original rock :Argillaceous sediment
			Metamorphic facies :Greenschist

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Primary layering	Strike/Dip :220 / 20	Syn-mineralisation ;...Effect :Controls
	Host rock	Crenulation cleavage		Post-mineralisation ;...Effect :None

Information(s) in free text format

Free text

Forekomsten ligger i en svakt skrånenede, flat elvedal med Mennaelva i vest og gruveområdet i øst. Idag finnes en stor tipp, rester av gruveutstyret og to inngjerdede sjakter (gjenrast). Området ligger rett østfor en to m høy foss i elva (ca. 100 m). Her finnes en forskifret rustsone <1 m mektig; denne er sikkert en av de få indikasjoner på malm i området. Rett ved denne fossen er det en vannfylt synk (Menna II) i tilknytning til denne rustsonen. Driften var på en <2 m mektig og py-po-cp-malm med gjennomsnittlig mektighet 1/2 - 3/4 m. Det er relativt lite malmstykker på tippen, som domineres av umineralisert klorittisk skifer. Denne bergarten viser dels krenulasjon, ellers homogen. Enkelte prøver med glinsende klorittskifer med 100 % kloritt? I tilknytning til malmen finnes bånd og slirer av klorittstykker, dels gnidd inn i malmen. 3 typer malm ble funnet ved befaringen: - Finkornet py-po-cp-malm, svakt utviklet bånding. Dels noe innblandet kvarts (matriks). Vanligste type . - Grovkornet py-po-malm med < 1 cm store porfyroblastiske py-korn og dels utviklet metamorf tekstur (durchbewegung). Smuldrer lett opp! - Semimassiv, stripet po-cp-malm, uregelmessig i kvartsrik skifer. Remobilisert cp i kvartslinser, evt. på stikk i kloritt (+ po). Malmen er også påtruffet i flere borhull rundt gruveområdet, max. 169 cm kis, ellers noe kisimpregnasjon.

Photo(s) from the Deposit area:

Photo no. 1 showing Svenkmenna gruvefelt"

Bibliography:

From NGU's Reference Archive:

Rui, Ingolf J.; Bakke, Inge , 1975

	Stratabound sulphide mineralization in the Kjøli area, Røros district, Norwegian Caledonides.

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.55 (1);51-75 pages

Abstract:

Two important sulphide ore-bearing formations have been recognized in the Cambro-Silurian succession of the Røros district. One is composed of submarine greenstones and quartz keratophyres (the Hersjø Formation). The other one, which is studied here, consists of a heterogeneous series of banded meta-argillites and meta-greywackes with subordinate thin green interlayers of probable volcanogenic origin (the Røsjø Formation). These two formations are embedded in a thick succession of various clastic sedimentary rocks which have undergone metamorphism and folding during the Silurian orogeny. The numerous sulphide deposits which occur in the Kjøli area are largely confined to the Røsjø Formation. The sulphide bodies are chiefly composed of massive pyrite and/or pyrrhotite showing variable chalcopyrite and sphalerite grades. The massive sulphides often occur as thin, extensive sheets, locally as irregular, small lenses which rarely exceed one metre in thickness. It is probable that the sulphides have been precipitated primarily on the sea-floor, but there is no clear evidence of a volcanogenic origin. Local discordant relationships between the massive sulphides and the wall rocks are ascribed to metamorphic mobilization of the sulphides. The thicker sulphide lenses may themselves represent mobilized portions of thinner sulphide-rich units.

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
	ST0217.01	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Homogen, småfoldet (krenulasjonskløv) klorittskifer.
	ST0217.02	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Skifrig klorittbergart, spesielt klorittrik, imidlertid underordnet på tippen, men typisk omv.fenomen v/malmen.
	ST0217.03	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Sprøforvitret, grov py-po-malm.
	ST0217.04	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Massiv po-py-cp-malm.
	ST0217.05	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Uregelmessige bånd og klumper av cp-po-malm i kvarts.
	ST0217.06	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Massiv, fink. py-po-mt-malm; uvanlig malmtype på tippen. Svartspettet (kvarts-mt-biotitt) i partier. Vasskisaktig.
	ST0217.07	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Py-po-bånd i klorittskifer, subparallell skifrigheten.
	ST0217.08	Dump	Sampler: Størseth, L.R./...Stored: Løkken Comment: Massiv-semimassiv po-cp-malm med tynne klorittrike lag (spalteplan) og kvartskorn (begynnende metamorf tekstur).
	399768	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	399769	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	399770	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	399772	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	399773	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	399774	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	399775	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	399794	Dump	Sampler: MINDEX ASA No. of registrated element analyses = 1
	399795	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: Menna II

(Object Id: 6665 26,01,00)

Location

County:

Trøndelag

Municipality:

Holtålen (5026)

Map 1:50000:

Ålen (1720-4)

Map 1:250000:

Røros

Coordinate system:

EU89-UTM Zone 32

East:

628418 m.

North:

6968942 m.

Longitude:

11.5209500

Latitude:

62.8280240

Show on map

Resource

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

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

Name of Locality: Menna III

(Object Id: 6666 26,02,00)

Location

County:

Trøndelag

Municipality:

Holtålen (5026)

Map 1:50000:

Ålen (1720-4)

Map 1:250000:

Røros

Coordinate system:

EU89-UTM Zone 32

East:

628419 m.

North:

6968792 m.

Longitude:

11.5208350

Latitude:

62.8266790

Show on map

Resource

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

Resources and production

	Activity:	Pitting	Reserves:
	Operating method:		Historical production:

---

Analyse Results

from

Deposit Area 5026 - 026 Svenskmenna

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#
399768	Dump	10000	1364	88	220	32	3.3	47.0
399769	Dump	19000	5791	83	540	77	6.5	44.0
399770	Dump	5321	805	22	19	16	2.2	45.0
399772	Dump	12000	9707	163	398	37	7.4	1248.0
399773	Dump	8965	36000	314	214	30	9.2	113.0
399774	Dump	3224	36000	153	228	28	4.1	193.0
399775	Dump	48000	2146	94	16	23	11.8	571.0
399794	Dump	507	349900	83600	24	30	136.8	198.0
399795	Dump	3031	146900	284	39	41	14.2	193.0

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

Sample No.	As*	Cd*	Ba*	Mo*	Sb*	Bi*	V*	Cr*	Mn*
399768	207	2.2	7	13.00	3	31	54	131	487
399769	213	27.3	2	16.00	3	108	6	110	182
399770	147	1.6	70	6.00	3	3	28	243	215
399772	394	65.6	5	16.00	3	129	11	152	118
399773	221	54.4	1	12.00	3	60	1	138	70
399774	224	82.4	4	11.00	3	38	9	118	199
399775	97	7.1	5	10.00	3	36	12	156	165
399794	51	474.4	2	13.00	35	213	3	52	785
399795	58	234.6	10	15.00	3	15	19	154	138

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

Sample No.	Fe%	Sr*	La*	Ti*
399768	10.00	7.0	10.00	120
399769	10.00	3.0	0.50	30
399770	7.98	7.0	7.00	180
399772	10.00	4.0	0.50	60
399773	10.00	3.0	0.50	30
399774	10.00	4.0	2.00	30
399775	10.00	3.0	1.00	120
399794	15.86	4.0	0.50	60
399795	16.37	12.0	3.00	240

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The fact sheet was created on 25.04.2024

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

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