Norsk versjon
	THE ORE DATABASE
	Deposit Area 1413 - 006
	(Last updated 15.mar.2024)

Importance

Public:

National Importance (reg. 03.06.2015)

Economical:

Significant , (Confirmed 19.sep.2001 by Are Korneliussen)

Products

	Element/product	Crude ore grade or quality
	TI	1.8 %
	TIO2	3 %

Operations

	From - To	Activity	Comments
	1994 - 1995	Sampling	Company/Institution :NGU
			Sampled by NGU in a collaboration project between NGU and DuPont/Conoco.

Mineralization

	Era:	Paleozoic	Period:	Devonian
	Dating:		Method:
	Genesis:	Metamorphic formation	Form:	Plate
	Main texture:	Banded	Min. distribution:	Disseminated (<20 % ore minerals)

Main grain size:

Fine grained (< 1 mm)

Main alteration:

Amphibolisation

	Strike/Dip:		Direction:
			Plunge:

Ti-deposit type(s)

	Main type:	Metamorphic	Ilm/Mt-ratio:
	Sub type:	Rutile in eclogite	%TiO(Ore):
	Titanium province:	Sunnfjord	%P2O5(Ore):
	Host rock:	Eclogite	%MgO(Ilm):
	Main Ti mineral:	Rutile	%V2O3(Mt):
			ppm U (Rutile):

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Mesoproterozoic

	Province:	Caledonian Basement Province
	Geotec.unit:	Western Gneiss Region
	Tectonic complex:
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Garnet	Major mineral (>10%)
	Gangue mineral	Amphibole	Major mineral (>10%)
	Gangue mineral	Pyroxene	Major mineral (>10%)
	Ore mineral	Rutile	Subordinate mineral (1-10%)

Lithology:

	Relationship	Rock	Origin
	Host rock	Eclogite	Intrusive Original rock :Gabbro
			Metamorphic facies :Eclogite
	Wall rock	Gneiss

Information(s) in free text format

Free text

The Orkheia eclogite is a E-W trending eclogite body; it resembles a thick eclogite sheet occupying the upper part of the Orkheia mountain approximately 400m above sea level. The mineralogy is very similar to Ramsgrønova. The deposit was samples in 1994-95 in a collaboration project between DuPont/Conoco, Stokke Industri and NGU; sampling was done by a small percussion drill machine talking drill dust samples for analyses, and by a ca. 200m long diamond drill-hole near the eastern end. The titanium content in the various samples available shows a continually variation from less than 1 % TiO2 to 6-7 % TiO2. More than 90% of the titanium occurs in rutile. Orkheia may contain slightly higher rutile content than Ramsgrønova. Approx. 1/3 of the southern part of the eclogite (the main body; see the geological map in NGU-report 2000.123 (Korneliussen and Furuhaug 2003)) is believed to contain at least 3 % TiO2 in average. A rough estimation of the ore resource is as follows: 1200 m (the length of the main body) x 200 m (average width) x 100 m (estimated average depth) x 3.2 tons/m3 (estimated average specific density) is equivalent to 80 million tons; of this amount approximately 1/3, i.e. 25-30 million tons contains at least 3 % rutile. The deposit has a good mineralogical quality and a larger rutile grain size than the eclogites in the Førdefjord area, such as Engebøfjellet. There is little doubt that the larger area (Orkheia + Ramsgrønova + Saurdal/Gjølanger) has a significant rutile potential.

Photo(s) from the Deposit area:

Photo no. 1 showing Geol kart Orkheia"

Bibliography:

From NGU's Reference Archive:

Korneliussen, Are; Furuhaug, Leif , 2000

	On the rutile deposit Ramsgrønova, Orkheia, Ødegården and Lindvik- kollen, S. Norway

;Norges geologiske undersøkelse;FAGRAPPORT;NGU-rapport; No.2000.123;35 pages

Korneliussen, Are ; McLimans, Roger ; Braathen, Alvar ; Erambert, Muriel ; Lutro, Ole ; Ragnhildstveit, Jomar , 2000

	Rutile in eclogites as a mineral resource in the Sunnfjord Region, Western Norway.

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.436;39-47 pages

Abstract:

The world's resources of the primary titanium raw materials ilmenite and rutile are very large. However, there is a lack of high-grade, high-quality ilmenite deposits as well as good rutile deposits. Particular focus has been given to rutilebearing eclogites in the Sunnfjord region of western Norway, due to a combination of factors such as high rutile content over significant volumes of rock and favourable rutile grainsize. Eclogites in the Sunnfjord region are found in a number of elongated lenses up to 3-4 km long, surrounded by gneisses of amphibolitic to granite composition, as well as numerous smaller eclogite bodies and eclogitised mafic layers in gneisses. The eclogites originated by high-pressure and temperature alteration of Proterozoic, Fe-Ti rich, gabbroic rocks, and were strongly deformed under eclogite-facies netamorphism and thereafter variably affected by retrograde processes. Eclogites in which conversation of ilmenite to rutle was complete and in which this mineral assemblage was negligibly affected by subsequent retrograde processes, are those of greatest economic potential. An example of such an eclogite is the Engebøfjellet eclogite on the north side of Førdefjord, Naustdal commune.

Fieldsamples

	Sample No.	Sample type	Miscellanrous
	K146A.93	Bedrock	Sampler :Are Korneliussen/...Stored :Løkken Comment :Eclogite No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	K153A.93	Bedrock	Sampler :Are Korneliussen/...Stored :Løkken Comment :Eclogite No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	K153B.93	Bedrock	Sampler :Are Korneliussen/...Stored :Løkken Comment :Eclogite No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	K153C.93	Bedrock	Sampler :Are Korneliussen/...Stored :Løkken Comment :Eclogite No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	K153E.93	Bedrock	Sampler :Are Korneliussen/...Stored :Løkken Comment :Eclogite No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	K153F.93	Bedrock	Sampler :Are Korneliussen/...Stored :Løkken Comment :Eclogite No. of registrated element analyses = 1 No. of registrated oxide analyses = 1
	K255.94	Bedrock	Sampler :Are Korneliussen/...Stored :Løkken Comment :Eclogite No. of registrated element analyses = 1 No. of registrated oxide analyses = 1

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

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Analyse Results

from

Deposit Area 1413 - 006 Orkheia

Element analyses

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

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Ba*	V*
K146A.93	Bedrock	17	93		73	185	115	195
K153A.93	Bedrock	123	106		76	245	29	661
K153B.93	Bedrock	175	111		74	226	29	812
K153C.93	Bedrock	17	113		65	93	201	162
K153E.93	Bedrock	56	121		64	109	87	561
K153F.93	Bedrock	0	28		18	52	210	62
K255.94	Bedrock	16	173	-10	36	-5	35	127

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Sample No.	Cr*	Rb*	Sr*	Y*	Zr*	Nb*	Ce*	Sc*
K146A.93	429	-5.0	245.0	0.0	17	-5.00	-0.10
K153A.93	615	-5.0	51.0	12.0	29	-5.00	0.62
K153B.93	229	-5.0	29.0	10.0	28	-5.00	0.50
K153C.93	6	6.0	176.0	21.0	41	-5.00	0.25
K153E.93	73	-5.0	51.0	16.0	34	-5.00	0.57
K153F.93	7	7.0	754.0	0.0	11	-5.00	0.35
K255.94	-5	-5.0	300.0	41.0	15	8.00	0.39	50.00

Oxide analyses

( All values are in % )

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
K146A.93	Bedrock	46.19	19.11	0.77	12.12	0.14	8.76	8.95
K153A.93	Bedrock	43.98	14.42	2.47	17.51	0.18	7.95	10.69
K153B.93	Bedrock	44.79	13.88	2.75	17.90	0.16	7.71	10.22
K153C.93	Bedrock	46.42	17.12	1.54	12.33	0.14	7.69	9.44
K153E.93	Bedrock	44.18	14.96	3.47	16.75	0.18	6.95	10.43
K153F.93	Bedrock	46.63	26.60	0.23	4.91	0.03	3.42	10.17
K255.94	Bedrock	42.08	13.16	3.91	19.98	0.34	5.18	10.83

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Sample No.	Na2O	K2O	P2O5	Sum
K146A.93	2.53	0.23	0.06	99.00
K153A.93	2.09	0.04	0.07	99.00
K153B.93	2.35	0.03	0.07	100.00
K153C.93	3.48	0.49	0.40	99.00
K153E.93	2.75	0.16	0.08	100.00
K153F.93	4.07	0.60	0.09	97.00
K255.94	1.64	0.05	2.17	99.00

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The fact sheet was created on 18.05.2024

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

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