Fact Sheet for <b>Occurence 5049

					Norsk versjon
	THE ORE DATABASE
	Occurence 5049 - 002 Gladsøya
	(Object Id: 303) (Last updated: 09.02.2005)

Location

County:

Trøndelag

Municipality:

Flatanger (5049)

Map 1:50000:

Jøssund (1623-1)

Map 1:250000:

Namsos

Coordinate system:

EU89-UTM Zone 32

East:

585599 m.

North:

7152532 m.

Longitude:

10.7813470

Latitude:

64.4874310

Show on map

Resource

	Resource Type:	Ferrous metals(Fe, Mn, Ti)	Resource Subtype:	Iron-Titanium
			Element(s):	Fe Ti

Importance

Raw material meaning:

Little Importance (reg. 18.02.2015)

Resources and production

	Activity:	Test mining	Reserves:
	Operating method:	Open pit mining	Historical production:	,15 thousand tons

Operations

From - To Activity Comments

1938 - 1938 Test mining

1939 - 1939 Geophysics

1964 - 1964 Sampling

Mineralization

Era: Proterozoic Period: Mesoproterozoic

Genesis: Volcex Form: Lens

Main texture: Banded Min. distribution: Massive (>50 % ore minerals)

Main grain size: Medium grained (1-3 mm) Main alteration:

Strike/Dip: 305 / 35 Direction: 125

Plunge: 10

Ti-deposit type(s)

Main type: Magmatic Ilm/Mt-ratio:

Sub type: Mt +/- Ilm +/- Ap in mafic intrusion %TiO(Ore): 6 - 12

Titanium province: Deposits outside the Ti - provinces %P2O5(Ore):

Host rock: Gabbro %MgO(Ilm): <1

Main Ti mineral: Ilmenite %V2O3(Mt): > 0.8

ppm U (Rutile):

Stratigraphic classification of host rock

Era: Proterozoic Period: Mesoproterozoic

Province: Caledonian Basement Province

Geotec.unit: Vestranden Complex

Tectonic complex:

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Biotite Major mineral (>10%)

Gangue mineral Quartz Major mineral (>10%)

Gangue mineral Amphibole Major mineral (>10%)

Gangue mineral Potassic feldspar Subordinate mineral (1-10%)

Gangue mineral Plagioclase Subordinate mineral (1-10%)

Ore mineral Magnetite Major mineral (>10%)

Ore mineral Ilmenite Subordinate mineral (1-10%)

Ore mineral Pyrrhotite Accessory mineral (<1%)

Ore mineral Pyrite Accessory mineral (<1%)

Ore mineral Chalcopyrite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Host rock Hornblende-biotite gneiss Extrusive
Original rock :Andesite

Metamorphic facies :Amphibolite

Structures

Location: Type: Orientation(360 gr.): Relation to min.:

Host rock Fold axis Strike/Dip :125 / 10 Post-mineralisation ;...Effect :Controls

Host rock Foliation Strike/Dip :305 / 35 Post-mineralisation ;...Effect :Modifies

Information(s) in free text format

Free text

Funnet ble første gang anmeldt i 1906 og mutet i 1907. På slutten av 30-årene ble det drevet inn en skjæring i den bratte fjellsida hvor malmen er blottet. Magnetometermålinger ble utført i 1939 av svenske interesser. Forekomsten ble befart i 1964 (Welde 1964). Skjæringen er drevet i 25 m lengde og 5 m bredde på skrå inn i fjellsida. Det er sprengt i opptil 10 m høyde. Den semimassive-massive titanomagnetitt-malmen er båndet og skifrig, og opptrer i granodiorittisk hornblende-biotittgneis (prøve 04, 05, 06 og 07). Malmen er blottet i ca 15 m lengde på skrå oppover fjellsida. Den er kontrollert av en fold. Nederst ved sålen er mektigheten 60 cm. Øverst, i foldeombøyningen er mektigheten 4 m. Hengbergart er middelskornet hornblende- biotittgneis med svovelkis som disseminasjon og på sprekker (01). Gneisen har opptil 1 cm mektige kvarts-feltspat-bånd. Nær malmens hengkontakt opptrer en 0.5 m mektig, konkordant pegmatitt med gneisfragmenter, store biotittplater og magnetkis-magnetitt-kobberkis-disseminasjon (02). Det er også flere diskordante pegmatittganger i heng-gneisen. Liggbergart er hornblende-biotittgneis med disseminasjon av magnetitt og svovelkis (03). Det er også sprengt litt i skrenten 40 m lenger NV, hvor det opptrer et 30 cm mektig magnetittmineralisert lag i båndet biotitt-hornblendegneis.

Photo(s) from the Deposit area:

Photo no. 1 showing 2,5x"

Photo no. 2 showing 50x"

Bibliography:

From NGU's Reference Archive:

Welde, H.

Undersøkelse av jernmalmforekomst Glasøy, Sør-Flatanger.

;Norges geologiske undersøkelse;FAGRAPPORT;Bergarkivet; No.BA 3483;7 pages

Abstract:

Området består av sterkt foldet hornblende-biotittskifer med smale feltspatganger og langstrakte kvartslinser. Strøk/fall N -65 grader/70 grader mot nord både på bergart og ilmenittmalm. Forekomsten har vært i forsøksdrift i 30 årene og malmen ligger i velter utenfor skjæringen. Middelanalyse av råmalm: 39 % Fe, 9 % Ti02, 0,27 % V. Det anbefales videre magnetometriske undersøkelser for å få nærmere rede på størrelsen av forekomsten.

Fieldsamples

Sample No. Sample type Miscellanrous

NT0351.01 Bedrock

Sampler: Wilberg, R.

Comment: Medium grained hornblende gneiss with pyrite dissemination. From hanging wall.

No. of registrated element analyses = 1

NT0351.02 Bedrock

Sampler: Wilberg, R.

Comment: Pegmatite with pyrrhotite, chalcopyrite and magnetite dissemination.

No. of registrated element analyses = 1

NT0351.03 Bedrock

Sampler: Wilberg, R.

Comment: Hornblende-biotite gneiss with dissemination of magnetite and pyrite. From foot wall.

No. of registrated element analyses = 1

NT0351.04 Bedrock

Sampler: Wilberg, R.

Comment: Medium grained, semimassive magnetite ore.

No. of registrated element analyses = 1

NT0351.05 Bedrock

Sampler: Wilberg, R.

Comment: Medium grained, semimassive magnetite ore.

No. of registrated element analyses = 1

NT0351.06 Bedrock

Sampler: Wilberg, R.

Comment: Medium grained, semimassive magnetite ore.

No. of registrated element analyses = 1

NT0351.07 Bedrock

Sampler: Wilberg, R.

Comment: Medium grained, semimassive magnetite ore.

No. of registrated element analyses = 1

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

Analyse Results

from

Deposit Area 5049 - 002 Gladsøya

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#

NT0351.01 Bedrock 243 32 2 16 24 .1 3.0

NT0351.02 Bedrock 57 46 4 20 20 .1 4.0

NT0351.03 Bedrock 24 79 3 52 27 .1 5.0

NT0351.04 Bedrock 22 63 10 80 84 .2 3.0

NT0351.05 Bedrock 48 38 2 60 86 .1 3.0

NT0351.06 Bedrock 54 54 4 63 76 .1 2.0

NT0351.07 Bedrock 21 43 9 62 64 .1 1.0

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

Sample No. Pt# Pd# As* Cd* Ba* Mo* Sb* Bi* S%

NT0351.01 1.0 2.0 2 .2 59 3.00 2 2 .19

NT0351.02 3.0 2.0 2 .2 290 2.00 2 2 .04

NT0351.03 2.0 2.0 2 .2 380 2.00 2 2 .05

NT0351.04 1.0 3.0 4 .5 398 2.00 2 2 .07

NT0351.05 2.0 9.0 2 .2 182 1.00 2 2 .03

NT0351.06 1.0 5.0 2 .3 181 2.00 2 2 .07

NT0351.07 1.0 10.0 2 .6 157 1.00 2 2 .04

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

Sample No. V* Cr* Mn* Fe% Th* U* W* Sr* La*

NT0351.01 19 27 205 2.06 3.00 5.00 2 15.0 11.00

NT0351.02 59 17 349 3.34 9.00 5.00 1 20.0 24.00

NT0351.03 743 21 259 15.19 5.00 5.00 1 15.0 4.00

NT0351.04 1362 234 149 24.02 3.00 9.00 1 7.0 2.00

NT0351.05 1484 56 170 24.49 3.00 5.00 1 29.0 4.00

NT0351.06 1175 36 175 22.22 3.00 7.00 1 30.0 2.00

NT0351.07 1254 59 152 23.07 3.00 7.00 1 19.0 3.00

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

Sample No. B*

NT0351.01 2

NT0351.02 2

NT0351.03 2

NT0351.04 2

NT0351.05 2

NT0351.06 2

NT0351.07 2

From - To	Activity	Comments
1938 - 1938	Test mining
1939 - 1939	Geophysics
1964 - 1964	Sampling

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

Main type:	Magmatic	Ilm/Mt-ratio:
Sub type:	Mt +/- Ilm +/- Ap in mafic intrusion	%TiO(Ore):	6 - 12
Titanium province:	Deposits outside the Ti - provinces	%P2O5(Ore):
Host rock:	Gabbro	%MgO(Ilm):	<1
Main Ti mineral:	Ilmenite	%V2O3(Mt):	> 0.8
		ppm U (Rutile):

	Province:	Caledonian Basement Province
	Geotec.unit:	Vestranden Complex
	Tectonic complex:
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Biotite	Major mineral (>10%)
Gangue mineral	Quartz	Major mineral (>10%)
Gangue mineral	Amphibole	Major mineral (>10%)
Gangue mineral	Potassic feldspar	Subordinate mineral (1-10%)
Gangue mineral	Plagioclase	Subordinate mineral (1-10%)
Ore mineral	Magnetite	Major mineral (>10%)
Ore mineral	Ilmenite	Subordinate mineral (1-10%)
Ore mineral	Pyrrhotite	Accessory mineral (<1%)
Ore mineral	Pyrite	Accessory mineral (<1%)
Ore mineral	Chalcopyrite	Accessory mineral (<1%)

Relationship	Rock	Origin
Host rock	Hornblende-biotite gneiss	Extrusive Original rock :Andesite
		Metamorphic facies :Amphibolite

Location:	Type:	Orientation(360 gr.):	Relation to min.:
Host rock	Fold axis	Strike/Dip :125 / 10	Post-mineralisation ;...Effect :Controls
Host rock	Foliation	Strike/Dip :305 / 35	Post-mineralisation ;...Effect :Modifies

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ag*	Au#
NT0351.01	Bedrock	243	32	2	16	24	.1	3.0
NT0351.02	Bedrock	57	46	4	20	20	.1	4.0
NT0351.03	Bedrock	24	79	3	52	27	.1	5.0
NT0351.04	Bedrock	22	63	10	80	84	.2	3.0
NT0351.05	Bedrock	48	38	2	60	86	.1	3.0
NT0351.06	Bedrock	54	54	4	63	76	.1	2.0
NT0351.07	Bedrock	21	43	9	62	64	.1	1.0

Sample No.	Pt#	Pd#	As*	Cd*	Ba*	Mo*	Sb*	Bi*	S%
NT0351.01	1.0	2.0	2	.2	59	3.00	2	2	.19
NT0351.02	3.0	2.0	2	.2	290	2.00	2	2	.04
NT0351.03	2.0	2.0	2	.2	380	2.00	2	2	.05
NT0351.04	1.0	3.0	4	.5	398	2.00	2	2	.07
NT0351.05	2.0	9.0	2	.2	182	1.00	2	2	.03
NT0351.06	1.0	5.0	2	.3	181	2.00	2	2	.07
NT0351.07	1.0	10.0	2	.6	157	1.00	2	2	.04

Sample No.	V*	Cr*	Mn*	Fe%	Th*	U*	W*	Sr*	La*
NT0351.01	19	27	205	2.06	3.00	5.00	2	15.0	11.00
NT0351.02	59	17	349	3.34	9.00	5.00	1	20.0	24.00
NT0351.03	743	21	259	15.19	5.00	5.00	1	15.0	4.00
NT0351.04	1362	234	149	24.02	3.00	9.00	1	7.0	2.00
NT0351.05	1484	56	170	24.49	3.00	5.00	1	29.0	4.00
NT0351.06	1175	36	175	22.22	3.00	7.00	1	30.0	2.00
NT0351.07	1254	59	152	23.07	3.00	7.00	1	19.0	3.00