Fact Sheet for <b>Deposit 1833

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit 1833 - 332 Nakkan
	(Object Id: 10326) (Last updated: 07.12.2015)

Location

County:

Nordland

Municipality:

Rana (1833)

Map 1:50000:

Mo i Rana (1927-1)

Map 1:250000:

Mo i Rana

Coordinate system:

EU89-UTM Zone 33

East:

451735 m.

North:

7357227 m.

Longitude:

13.9225680

Latitude:

66.3310600

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Resource

Resource Type:

Talc

Resource Subtype:

Talc

Importance

Raw material meaning:

National Importance (reg. 20.02.2015)

Resources and production

	Activity:	Exploration	Reserves:	1700 thousand tons
	Operating method:	Underground mining	Historical production:

Mineralization

Genesis: Form:

Main texture: Min. distribution:

Main grain size:

Strike/Dip: Direction:

Plunge:

Stratigraphic classification of host rock

Era: Period:

Province: Caledonides

Geotec.unit: Rødingsfjell Nappe Complex

Tectonic complex: Straumbotn Nappe

Igneous complex:

Group: Formation:

Mineralogy

Mineral Amount

Talc Major mineral (50-90%)

Magnesite Major mineral (10-50%)

Chlorite Subordinate mineral (1-10%)

Magnetite Accessory mineral (<1%)

Information(s) in free text format

Free text

The Nakkan deposit was found by airborne geophysics (Mogaard & Walker 1991), magnetic modelling (Karlsen & Olesen 1992, 1996) and subsequent diamond core drilling in 1991-1992 (reported in Karlsen 1995). The minimum distance from Store Esjeklumpen is around 150 m, while the distance from the existing mine is around 3 km. As for the other talc-deposits in the area, the talc ore is situated as a rim around the serpentinitic core, but also within big joints that cut the serpentinite. The upper parts of the Nakkan ultramafite have been investigated by drilling in 1992, 1996, 1997, 1998 and 1999 with a total sum of 16310 m (E. Rian, pers. comm.). The lower levels have not been investigated. It is possible that the Nakkan ultramafite contains around 6 mill. tonnes of ore (Karlsen et al. in prep.). See also Karlsen (1995, 1996, 1997, 1999) for further information. Reserve estimation by T. A. Karlsen indicate reserve of 1,7 mill tons.

Bibliography:

From NGU's Reference Archive:

Karlsen, Tor Arne ; Rian, Edvin ; Olesen, Odleiv , 2000

Overwiew of talc resources in the Altermark talc province, northern Norway, and possible uses of the talc ore

;Norges geologiske undersøkelse;TIDSSKRIFTARTIKKEL;NGU Bulletin; No.436;93-102 pages

Abstract:

Active prospecting during the past 10 years has proved that the Altermark area contains much more talc than previously recognised in the Nakkan-Esjeklumpen area, 10 M tonnes or more of talc-carbonate ore are probably present, distributed in ultramafic bodies. The ore, which occurs as one of several layers within compositionally zoned ultramafic lenses dominated by antigorite serpentinites, has the following general mineralogy; talc (45-65%), carbonate (30-50%), chlorite (0-4%) and magnetite (0-3%). Relative to other known similar deposits, the ore is rather coarse-grained, and the minerals tend to be idio- blastic. Several products can be made from the talc-carbonate ore. By applying flotation or other kinds of mineral separation techniques, it is likely that high-quality talc-concentrate could be made in addition to calc-carbonate mixtures. a concentrate of by-product breunnerite would possibly be of ecomonic value.

Søvegjarto, U.; Marker, M.; Graversen, O. , 1988

Mo i Rana. Berggrunnskart; Mo i Rana; 19271; 1:50 000; trykt i farger;

;Norges geologiske undersøkelse;KART

	Genesis:		Form:
	Main texture:		Min. distribution:

	Province:	Caledonides
	Geotec.unit:	Rødingsfjell Nappe Complex
	Tectonic complex:	Straumbotn Nappe
	Igneous complex:

	Mineral	Amount
	Talc	Major mineral (50-90%)
	Magnesite	Major mineral (10-50%)
	Chlorite	Subordinate mineral (1-10%)
	Magnetite	Accessory mineral (<1%)