Fact Sheet for <b>Deposit 3909 - 006 Sæteråsen</b>

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	THE ORE DATABASE
	Deposit 3909 - 006 Sæteråsen
	(Object Id: 5806) (Last updated: 13.03.2024)

Location

County:

Vestfold

Municipality:

Larvik (3909)

Map 1:50000:

Holmestrand (1813-4)

Map 1:250000:

Oslo

Coordinate system:

EU89-UTM Zone 32

East:

556968 m.

North:

6573191 m.

Longitude:

10.0001380

Latitude:

59.2937700

Show on map

Resource

	Resource Type:	Special metals (Nb,Ta,Be,Li,Sc,REE)	Resource Subtype:	Niobium
			Element(s):	Nb REE

Importance

Raw material meaning:

Not Assessed (reg. 20.05.2015)

Resources and production

	Activity:	Exploration	Reserves:	8000 thousand tons
	Operating method:		Historical production:

Products

Element/product Crude ore grade or quality Reg. date

Nb 2450 ppm 13.03.2024

REE 0,35 % 13.03.2024

Th 490 ppm 17.09.2007

Y 0,075 % 13.03.2024

Zr 2,25 % 17.09.2007

Mineralization

Era: Paleozoic Period: Permian

Genesis: Orthomagmatic formation Form: Ruler

Main texture: Massive Min. distribution: Disseminated (<20 % ore minerals)

Main grain size: Fine grained (< 1 mm) Main alteration:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period: Permian

Province: Oslo Region

Geotec.unit: Vestfold-Ringerike Graben

Tectonic complex:

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Gangue mineral Plagioclase Major mineral (>10%)

Gangue mineral Albite Major mineral (>10%)

Gangue mineral Potassic feldspar Major mineral (>10%)

Gangue mineral Garnet Subordinate mineral (1-10%)

Gangue mineral Zoisite Subordinate mineral (1-10%)

Gangue mineral Quartz Subordinate mineral (1-10%)

Gangue mineral Pyroxene Subordinate mineral (1-10%)

Gangue mineral Amphibole Subordinate mineral (1-10%)

Gangue mineral Hematite Subordinate mineral (1-10%)

Gangue mineral Magnetite Subordinate mineral (1-10%)

Gangue mineral Apatite Accessory mineral (<1%)

Ore mineral Pyrochlore Subordinate mineral (1-10%)

Ore mineral Chevkinite Subordinate mineral (1-10%)

Ore mineral Euxenite Subordinate mineral (1-10%)

Ore mineral Fergusonite Subordinate mineral (1-10%)

Ore mineral Zircon Subordinate mineral (1-10%)

Ore mineral Titanite Accessory mineral (<1%)

Lithology:

Relationship Rock Origin

Host rock Aphyric trachyte Extrusive
Original rock :Trachyte

Metamorphic facies :Zeolite

Wall rock Porphyritic trachyte Extrusive

Metamorphic facies :Zeolite

Wall rock Latite porphyry Extrusive
Original rock :Rhomb porphyry

Metamorphic facies :Zeolite

Information(s) in free text format

Free text

The Sæteråsen Nb deposit constitutes two aphyric, trachytic lavaflows within a sequence of porphyric trachytes and rhomb-porphyry lavas. Petrographic and petrologic studies, show that Nb, Ce, La, Y are incorporated the minerals euxenite, pyrochlore, chevkinite, fergusonite and apatite within the lavaflows. A rough estimate based on analyses of only 4 drillholes gives a tonnage of 8 mill.t. with 0.245% Nb, 0.18% Ce, 0.11% La, 0,075% Y, 0,069% Nd og 0,049% Th. It is quite possible that similar deposits are found elsewhere within the Vestfold lava plateau.

Bibliography:

From NGU's Reference Archive:

Ihlen, P. M. , 1983

Geologiske og petrokjemiske resultater fra diamantboring på Sæteråsen niob-forekomst.

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.1800/76B;39 pages

Abstract:

Sæteråsen Nb-forekomst utgjøres av to afyriske trakytt-strømmer som opptrer innenfor en sekvens av porfyriske trakytter og rombeporfyr lavaer. Petrografiske og petrokjemiske undersækelser av de Nb-førende trakytter viser at de økonomisk interessante elementene Nb,Ce,La,Y og Nb er konsentrert i mineralene euxenitt, pyroklor, chevikinitt, ferqusonitt og apatitt. Et grovt estimat av mulige malmreserver i Sæteråsen basert på analyser av fire diamantborhull gir en total tonnasje på ca. 8 mill. tonn med 0.245% Nb, 0.18% Ce, 0.11% La, 0,075% Y, 0,069% Nd og 0,049% Th. Mulighetene for å finne lignende forekomster innenfor Vestfolds lavaplatå er gode.

Ryghaug, Per , 1983

Geochemical exploration methods for niobium and rare earth elements at Sæteråsen, Vestfold volcanic are, Oslo Graben

;Norsk geologisk forening;TIDSSKRIFTARTIKKEL;Norsk geologisk tidsskrift; No.63 (1);1-13 pages

Abstract:

Frie emneord: Tracer-metode Geochemical exploration methods for niobium and rare earth elements in Oslo Graben have been studied using the occurrence at Sæteråsen. Vestfold as a test area. The deposit consists of two lens-shaped bodies of aphyric trachytic lava within a sequence of porphyritic latites and trachytes. The extrusive rocks are intruded by nordmarkite and larvikite. Samples of various types of stream sediment, stream moss, soil and rock have been analyzed for the total contents of Ba, Ce, La, Nb, Rb, Sr, Th, U, Y and Zr by an X-ray fluorescence method. The relationship between the concentrations and ionic potentials of trace elements in stream-moss samples and different types of sediment and rock samp- les are discussed. Streammoss samples gave significant La-and U-anomalies in the area, while no distinct stream-sediment anomalies were encountered.

Fieldsamples

Sample No. Sample type Miscellanrous

Bh1 Core

Comment: averade analysis reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Bh2 Core

Comment: averade analysis reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Bh3 Core

Comment: averade analysis reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Bh4 Core

Comment: averade analysis reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Ihlen1 Bedrock

Comment: massiv grey trachyte reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Ihlen2 Bedrock

Comment: black boarder facies lithology reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Ihlen3 Bedrock

Comment: massiv grey trachyte reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Ihlen4 Bedrock

Comment: dark grey trachyte reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Ihlen5 Bedrock

Comment: aphyritic trachyte reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Ihlen6 Bedrock

Comment: dark porphyritic trachyte reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

Ihlen7 Bedrock

Comment: reddish trachyte reported by Ihlen (1983)

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

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

Analyse Results

from

Deposit Area 3909 - 006 Sæteråsen

Element analyses
( *=parts pr. million, #=parts pr.billion, Negative values means below detection limit value.)

Sample No. Sample Type Zn* Ba* Th* U* Rb* Sr* Y*

Bh1 Core 463.00 35.00 720.0

Bh2 Core 492.00 35.00 741.0

Bh3 Core 511.00 36.00 778.0

Bh4 Core 476.00 38.00 754.0

Ihlen1 Bedrock 972 110 370.00 953.0 109.0 729.0

Ihlen2 Bedrock 468 250 603.0 307.0 631.0

Ihlen3 Bedrock 739 120 370.00 1287.0 74.0 761.0

Ihlen4 Bedrock 611 260 360.00 1222.0 255.0 795.0

Ihlen5 Bedrock 227 300 224.0 36.0 163.0

Ihlen6 Bedrock 118 1020 17.00 266.0 181.0 76.0

Ihlen7 Bedrock 98 1000 13.00 215.0 204.0 61.0

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

Sample No. Zr* Nb* La* Ce* Nd* Sm* Eu* Tb* Yb*

Bh1 2400.00 1150.00 1800.00

Bh2 2500.00 1200.00 1900.00

Bh3 2500.00 1100.00 1900.00 701.00

Bh4 2400.00 1000.00 1700.00 655.00

Ihlen1 12882 253.00 900.00 1810.00 520.00 82.00 12.00 12.00 90.00

Ihlen2 11105 222.00

Ihlen3 15177 2366.00 930.00 1790.00 580.00 81.00 13.00 13.00 95.00

Ihlen4 16139 2685.00 610.00 1660.00 450.00 73.00 11.00 10.00 75.00

Ihlen5 2739 567.00

Ihlen6 666 199.00 133.00 280.00 120.00 19.00 4.00 1.00 9.00

Ihlen7 814 192.00 130.00 275.00 115.00 18.00 4.00 2.00 7.00

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

Sample No. Lu*

Bh1

Bh2

Bh3

Bh4

Ihlen1 12.00

Ihlen2

Ihlen3 12.00

Ihlen4 11.00

Ihlen5

Ihlen6 1.00

Ihlen7 1.00

Oxide analyses
( All values are in % )

Sample No. Sample Type SiO2 Al2O3 TiO2 Fe2O3 FeO MnO MgO

Bh1 Core

Bh2 Core

Bh3 Core

Bh4 Core

Ihlen1 Bedrock 57.79 15.89 0.95 7.83 1.25 0.76 1.07

Ihlen2 Bedrock 58.64 15.44 0.85 6.73 1.00 0.70 0.41

Ihlen3 Bedrock 58.99 15.40 0.93 6.55 1.66 0.64 1.03

Ihlen4 Bedrock 56.67 15.61 0.99 7.85 0.77 0.34 1.17

Ihlen5 Bedrock 61.64 16.61 0.82 4.84 0.93 0.05 0.61

Ihlen6 Bedrock 58.94 16.24 1.80 5.01 1.74 0.14 1.32

Ihlen7 Bedrock 58.76 16.61 1.72 3.67 2.63 0.12 1.28

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

Sample No. Na2O K2O P2O5 Loss Sum

Bh1 .00

Bh2 .00

Bh3 .00

Bh4 .00

Ihlen1 5.23 5.54 0.04 0.42 97.00

Ihlen2 5.66 5.61 0.11 0.41 96.00

Ihlen3 6.19 4.75 0.02 0.33 96.00

Ihlen4 3.85 7.62 0.14 0.46 95.00

Ihlen5 5.46 6.66 0.15 0.60 98.00

Ihlen6 5.26 5.14 0.48 0.19 96.00

Ihlen7 5.72 4.97 0.46 0.20 96.00

Element/product	Crude ore grade or quality	Reg. date
Nb	2450 ppm	13.03.2024
REE	0,35 %	13.03.2024
Th	490 ppm	17.09.2007
Y	0,075 %	13.03.2024
Zr	2,25 %	17.09.2007

Era:	Paleozoic	Period:	Permian
Genesis:	Orthomagmatic formation	Form:	Ruler
Main texture:	Massive	Min. distribution:	Disseminated (<20 % ore minerals)

	Province:	Oslo Region
	Geotec.unit:	Vestfold-Ringerike Graben
	Tectonic complex:
	Igneous complex:

Relationship	Mineral	Amount
Gangue mineral	Plagioclase	Major mineral (>10%)
Gangue mineral	Albite	Major mineral (>10%)
Gangue mineral	Potassic feldspar	Major mineral (>10%)
Gangue mineral	Garnet	Subordinate mineral (1-10%)
Gangue mineral	Zoisite	Subordinate mineral (1-10%)
Gangue mineral	Quartz	Subordinate mineral (1-10%)
Gangue mineral	Pyroxene	Subordinate mineral (1-10%)
Gangue mineral	Amphibole	Subordinate mineral (1-10%)
Gangue mineral	Hematite	Subordinate mineral (1-10%)
Gangue mineral	Magnetite	Subordinate mineral (1-10%)
Gangue mineral	Apatite	Accessory mineral (<1%)
Ore mineral	Pyrochlore	Subordinate mineral (1-10%)
Ore mineral	Chevkinite	Subordinate mineral (1-10%)
Ore mineral	Euxenite	Subordinate mineral (1-10%)
Ore mineral	Fergusonite	Subordinate mineral (1-10%)
Ore mineral	Zircon	Subordinate mineral (1-10%)
Ore mineral	Titanite	Accessory mineral (<1%)

Relationship	Rock	Origin
Host rock	Aphyric trachyte	Extrusive Original rock :Trachyte
		Metamorphic facies :Zeolite
Wall rock	Porphyritic trachyte	Extrusive
		Metamorphic facies :Zeolite
Wall rock	Latite porphyry	Extrusive Original rock :Rhomb porphyry
		Metamorphic facies :Zeolite

Sample No.	Sample Type	Zn*	Ba*	Th*	U*	Rb*	Sr*	Y*
Bh1	Core			463.00	35.00			720.0
Bh2	Core			492.00	35.00			741.0
Bh3	Core			511.00	36.00			778.0
Bh4	Core			476.00	38.00			754.0
Ihlen1	Bedrock	972	110	370.00		953.0	109.0	729.0
Ihlen2	Bedrock	468	250			603.0	307.0	631.0
Ihlen3	Bedrock	739	120	370.00		1287.0	74.0	761.0
Ihlen4	Bedrock	611	260	360.00		1222.0	255.0	795.0
Ihlen5	Bedrock	227	300			224.0	36.0	163.0
Ihlen6	Bedrock	118	1020	17.00		266.0	181.0	76.0
Ihlen7	Bedrock	98	1000	13.00		215.0	204.0	61.0

Sample No.	Zr*	Nb*	La*	Ce*	Nd*	Sm*	Eu*	Tb*	Yb*
Bh1		2400.00	1150.00	1800.00
Bh2		2500.00	1200.00	1900.00
Bh3		2500.00	1100.00	1900.00	701.00
Bh4		2400.00	1000.00	1700.00	655.00
Ihlen1	12882	253.00	900.00	1810.00	520.00	82.00	12.00	12.00	90.00
Ihlen2	11105	222.00
Ihlen3	15177	2366.00	930.00	1790.00	580.00	81.00	13.00	13.00	95.00
Ihlen4	16139	2685.00	610.00	1660.00	450.00	73.00	11.00	10.00	75.00
Ihlen5	2739	567.00
Ihlen6	666	199.00	133.00	280.00	120.00	19.00	4.00	1.00	9.00
Ihlen7	814	192.00	130.00	275.00	115.00	18.00	4.00	2.00	7.00

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	FeO	MnO	MgO
Bh1	Core
Bh2	Core
Bh3	Core
Bh4	Core
Ihlen1	Bedrock	57.79	15.89	0.95	7.83	1.25	0.76	1.07
Ihlen2	Bedrock	58.64	15.44	0.85	6.73	1.00	0.70	0.41
Ihlen3	Bedrock	58.99	15.40	0.93	6.55	1.66	0.64	1.03
Ihlen4	Bedrock	56.67	15.61	0.99	7.85	0.77	0.34	1.17
Ihlen5	Bedrock	61.64	16.61	0.82	4.84	0.93	0.05	0.61
Ihlen6	Bedrock	58.94	16.24	1.80	5.01	1.74	0.14	1.32
Ihlen7	Bedrock	58.76	16.61	1.72	3.67	2.63	0.12	1.28

Sample No.	Na2O	K2O	P2O5	Loss	Sum
Bh1					.00
Bh2					.00
Bh3					.00
Bh4					.00
Ihlen1	5.23	5.54	0.04	0.42	97.00
Ihlen2	5.66	5.61	0.11	0.41	96.00
Ihlen3	6.19	4.75	0.02	0.33	96.00
Ihlen4	3.85	7.62	0.14	0.46	95.00
Ihlen5	5.46	6.66	0.15	0.60	98.00
Ihlen6	5.26	5.14	0.48	0.19	96.00
Ihlen7	5.72	4.97	0.46	0.20	96.00