Fact Sheet for Deposit Area 1845

					Norsk versjon
	THE ORE DATABASE
	Deposit Area 1845 - 014
	(Last updated 23.okt.2024)

Name of Deposit Area : Gjerdalsvann

(Object Id : 1845,014,00,00)

Location

County :

Nordland (18)

Municipality :

Sørfold (1845)

Map 1:50000:

Gjerdal (2130-2)

Map 1:250000:

Sulitjelma

Marking point:

Longitude:

16.1356130

Latitude:

67.6945320

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

548097 m.

Y-coord:

7509248 m.

Commodity

	Main Type:	Special metals (Nb,Ta,Be,Li,Sc,REE)	Sub Type:	REE-metals
			Element(s):	La Ce Nb Y U Th

Production

Activity:	Exploration	Reserves:
Prod. method:		Production:
Prod. status:		Volume of dump:

Importance

Public: (No data)

Economical: Not classified/evaluated

Mineralization

Era: Period:

Dating: Method:

Genesis: Form:

Main texture: Min. distribution:

Main grain size: Main alteration:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province:

Geotec.unit:

Tectonic complex:

Igneous complex:

Group: Formation:

Information(s) in free text format

Free text

Müller (2011) write the following: The Gjerdalsvatn locality was chosen as target area on the basis of one Uranal database analysis of granite gneiss with anomalously high La - 541 ppm and Ce - 1200 ppm (Müller 2010). The sample was collected by J. Hysingjord in the 1970s. The locality was immediately identified in the field because of high gamma-radiation of >700 cps compared to the host granite gneiss with about 400 cps. The rock with the high gamma-radiation forms a dyke-like structure which is about 600 m long and up to 20 m wide and plunges 60-70º to the S-SE (Figs. 21, 22). The estimated resource is about 150 000 tons assuming a vertical extension of the mineralisation of 25 m. It is a fine-grained, almost aplitic biotite granite gneiss which can be easily distinguished from the coarse-grained granite gneiss host (Fig. 22b). Four finegrained granite gneiss samples (23091001, -02, -04, 28091009) and one coarse-grained granite gneiss sample (23091003) were collected. Surprisingly, the host granite gneiss (sample 23091003) has the highest REO+Y2O3 of 0.111 wt.% but the lowest U - 4 ppm and Th of 30 ppm, explaining the low gamma-ray intensity (Fig. 23). The fine-grained granite gneiss contain 0.010 to 0.052 wt.% REO+Y2O3, 164 - 230 ppm Zr, 38-56 ppm Th and 5 - 21 ppm U. In this case, the scintillometer measurements are not indicative for elevated REE concentrations. The Gjerdalsvatn granite gneisses are slightly enriched in LREE compared to average granite composition and slightly depleted in HREE (Fig. 24). Sample 28091009 is, for some reason, depleted in all REE compared to the average granite composition. The most common REE-bearing accessory minerals are allanite (20-250 µm), zircon (20-120 µm) and apatite (40-100 µm) (Fig. 25). The LREE enrichment is explained by the dominance of allanite and apatite over zirco

Bibliography:

From NGU's Reference Archive:

Müller, Axel , 2011

Potential of rare earth element and Zr-, Be, U-, Th-, (W-) mineralisations in central and northern Nordland - Part 2

;Norges geologiske undersøkelse;RAPPORT;NGU-rapport; No.2011.021;56 pages

Abstract:

In this report results of the investigation of potential rare earth elements (REE) and Zr-, Be, U-, Th-, (W-) mineralisations in central and northern Nordland are presented. The investigated and sampled mineralisations were proposed in NGU report 2009.037 on the basis if existing reports and geochemical data sets. The investigation targets were evolved Proterozoic TIB-type granites (TIB = Trans-Scandinavian Igneous Belt) of the Tysfjord, Sommerset and Rishaugfjell basement windows, in particular, the Hatten- Tilthornet massif, Hundholmen, Kjerrfjellet, Hellemobotn, Reinoksskardet, upper Gjerdalen areas, the Sommerset basement Window, Rismålsvatn, and Memaurvatn. The general aim was to identify Zr-Ree mineralisations with >= 2wt.% REO (including Y2O3; REO - rare earth oxides) which are possibly enriched in Be, U and Th as well.

Fieldsamples

Sample No. Sample type Miscellanrous

23091001 Bedrock

Sampler :Axel M¿ller

Comment :fine-grained biotite granite gneiss, mineralised, UTM east 548097, UTM north 7509249

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

23091002 Bedrock

Sampler :Axel M¿ller

Comment :fine-grained biotite granite gneiss, mineralised, UTM east 548030, UTM north 7509236

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

23091003 Bedrock

Sampler :Axel M¿ller

Comment :coarse-grained biotite granite gneiss, non-mineralised, UTM east 548063, UTM north 7509252

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

23091004 Bedrock

Sampler :Axel M¿ller

Comment :fine-grained biotite granite gneiss, mineralised, UTM east 548162, UTM north 7509248

No. of registrated element analyses = 1

No. of registrated oxide analyses = 1

28091009 Bedrock

Sampler :Axel M¿ller

Comment :fine-grained biotite granite gneiss, mineralised, UTM east 547785, UTM north 7509232

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 1845 - 014 Gjerdalsvann

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

Sample No. Sample Type Cu* Zn* Pb* Co* Ni* Au# As*

23091001 Bedrock 0 74 6 1 1 -.5 1

23091002 Bedrock 0 59 8 1 0 -.5 1

23091003 Bedrock 1 72 10 1 -0 -.5 1

23091004 Bedrock 0 53 8 1 1 -.5 1

28091009 Bedrock 0 38 3 1 0 -.5 -1

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

Sample No. Cd* Ba* Mo* Sn* Sb* Bi* Se* Ga* V*

23091001 -.1 357 1.80 2 -0 -0 -0.50 20.40 -8

23091002 -.1 341 2.40 2 -0 -0 -0.50 20.30 -8

23091003 -.1 439 2.00 1 -0 -0 -0.50 24.10 -8

23091004 -.1 261 0.40 -1 -0 -0 -0.50 19.80 -8

28091009 -.1 388 2.20 2 -0 -0 -0.50 18.60 -8

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

Sample No. Th* U* W* Rb* Sr* Y* Zr* Nb* Cs*

23091001 56.10 21.60 -1 241.8 86.9 31.9 218 24.10 1.90

23091002 41.90 13.90 -1 266.1 87.0 34.7 203 22.00 2.60

23091003 30.30 4.60 -1 233.5 79.9 53.3 382 31.40 0.80

23091004 44.00 10.10 -1 243.1 78.1 24.4 164 22.50 2.40

28091009 37.60 4.90 -1 224.2 113.8 19.0 230 19.10 1.20

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

Sample No. La* Ce* Pr* Nd* Sm* Eu* Gd* Tb* Dy*

23091001 95.60 197.60 19.27 63.70 9.45 0.61 6.63 1.04 5.72

23091002 94.50 184.70 19.04 61.90 9.35 0.62 6.98 1.14 6.27

23091003 198.70 444.00 42.56 148.20 20.03 1.27 13.61 2.03 10.06

23091004 62.10 127.60 13.34 44.50 6.75 0.48 5.27 0.85 4.50

28091009 7.90 33.00 1.99 6.80 1.91 0.23 1.81 0.42 2.84

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

Sample No. Ho* Er* Tm* Yb* Lu* Be* Hf* Hg* Tl*

23091001 1.10 3.05 0.48 2.97 0.40 5 6.50 -0 1

23091002 1.24 3.60 0.53 3.33 0.51 4 6.90 -0 1

23091003 1.90 5.51 0.80 4.86 0.75 3 10.60 -0 0

23091004 0.91 2.49 0.37 2.29 0.32 4 5.90 -0 1

28091009 0.66 2.07 0.31 2.19 0.31 3 7.10 -0 0

Oxide analyses
( All values are in % )

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

23091001 Bedrock 73.72 13.61 0.22 2.09 0.03 0.27 0.77

23091002 Bedrock 74.09 13.48 0.19 1.86 0.04 0.21 0.77

23091003 Bedrock 73.32 13.08 0.23 2.49 0.05 0.08 0.77

23091004 Bedrock 74.54 13.44 0.16 1.60 0.03 0.22 0.72

28091009 Bedrock 73.20 13.68 0.19 1.90 0.04 0.21 0.97

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

Sample No. Na2O K2O P2O5 Loss Sum

23091001 3.92 5.02 0.04 0.20 100.00

23091002 3.65 5.27 0.04 0.30 100.00

23091003 3.34 6.01 0.03 0.40 100.00

23091004 3.96 4.93 0.03 0.30 100.00

28091009 3.44 5.54 0.04 0.70 100.00

	Era:		Period:
	Dating:		Method:
	Genesis:		Form:
	Main texture:		Min. distribution:

	Province:
	Geotec.unit:
	Tectonic complex:
	Igneous complex:

Sample No.	Sample Type	Cu*	Zn*	Pb*	Co*	Ni*	Au#	As*
23091001	Bedrock	0	74	6	1	1	-.5	1
23091002	Bedrock	0	59	8	1	0	-.5	1
23091003	Bedrock	1	72	10	1	-0	-.5	1
23091004	Bedrock	0	53	8	1	1	-.5	1
28091009	Bedrock	0	38	3	1	0	-.5	-1

Sample No.	Cd*	Ba*	Mo*	Sn*	Sb*	Bi*	Se*	Ga*	V*
23091001	-.1	357	1.80	2	-0	-0	-0.50	20.40	-8
23091002	-.1	341	2.40	2	-0	-0	-0.50	20.30	-8
23091003	-.1	439	2.00	1	-0	-0	-0.50	24.10	-8
23091004	-.1	261	0.40	-1	-0	-0	-0.50	19.80	-8
28091009	-.1	388	2.20	2	-0	-0	-0.50	18.60	-8

Sample No.	Th*	U*	W*	Rb*	Sr*	Y*	Zr*	Nb*	Cs*
23091001	56.10	21.60	-1	241.8	86.9	31.9	218	24.10	1.90
23091002	41.90	13.90	-1	266.1	87.0	34.7	203	22.00	2.60
23091003	30.30	4.60	-1	233.5	79.9	53.3	382	31.40	0.80
23091004	44.00	10.10	-1	243.1	78.1	24.4	164	22.50	2.40
28091009	37.60	4.90	-1	224.2	113.8	19.0	230	19.10	1.20

Sample No.	La*	Ce*	Pr*	Nd*	Sm*	Eu*	Gd*	Tb*	Dy*
23091001	95.60	197.60	19.27	63.70	9.45	0.61	6.63	1.04	5.72
23091002	94.50	184.70	19.04	61.90	9.35	0.62	6.98	1.14	6.27
23091003	198.70	444.00	42.56	148.20	20.03	1.27	13.61	2.03	10.06
23091004	62.10	127.60	13.34	44.50	6.75	0.48	5.27	0.85	4.50
28091009	7.90	33.00	1.99	6.80	1.91	0.23	1.81	0.42	2.84

Sample No.	Ho*	Er*	Tm*	Yb*	Lu*	Be*	Hf*	Hg*	Tl*
23091001	1.10	3.05	0.48	2.97	0.40	5	6.50	-0	1
23091002	1.24	3.60	0.53	3.33	0.51	4	6.90	-0	1
23091003	1.90	5.51	0.80	4.86	0.75	3	10.60	-0	0
23091004	0.91	2.49	0.37	2.29	0.32	4	5.90	-0	1
28091009	0.66	2.07	0.31	2.19	0.31	3	7.10	-0	0

Sample No.	Sample Type	SiO2	Al2O3	TiO2	Fe2O3	MnO	MgO	CaO
23091001	Bedrock	73.72	13.61	0.22	2.09	0.03	0.27	0.77
23091002	Bedrock	74.09	13.48	0.19	1.86	0.04	0.21	0.77
23091003	Bedrock	73.32	13.08	0.23	2.49	0.05	0.08	0.77
23091004	Bedrock	74.54	13.44	0.16	1.60	0.03	0.22	0.72
28091009	Bedrock	73.20	13.68	0.19	1.90	0.04	0.21	0.97

Sample No.	Na2O	K2O	P2O5	Loss	Sum
23091001	3.92	5.02	0.04	0.20	100.00
23091002	3.65	5.27	0.04	0.30	100.00
23091003	3.34	6.01	0.03	0.40	100.00
23091004	3.96	4.93	0.03	0.30	100.00
28091009	3.44	5.54	0.04	0.70	100.00