Fact Sheet for Deposit Area 1837

					Norsk versjon
	THE INDUSTRIAL MINERAL DATABASE
	Deposit Area 1837 - 301
	(Last updated 27.apr.2007)

Name of Deposit Area : Mefjell

(Object Id : 1837,301,00,00)

Location

County :

Nordland (18)

Municipality :

Meløy (1837)

Map 1:50000:

Melfjorden (1928-3)

Map 1:250000:

Mo i Rana

Marking point:

Longitude:

13.4412360

Latitude:

66.7287150

EU89-UTM Zone 33

(Coordinates IS confirmed)

X-coord:

431283 m.

Y-coord:

7401997 m.

Commodity

Main Type:

Feldspar

Sub Type:

Pegmatitic feldspar

Production

Activity:	Test mining	Reserves:
Prod. method:	Underground mining	Production:	0 thousand tons
Prod. status:		Volume of dump:

Importance

Public: Not Assessed (reg. 18.02.2015)

Economical: Not classified/evaluated

Mineralization

Era: Paleozoic Period:

Dating: Method:

Genesis: Hydrothermal vein Form: Irregular

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

Main grain size: Coarse grained (> 3 mm)

Strike/Dip: 150 / 90 Direction:

Plunge:

Stratigraphic classification of host rock

Era: Paleozoic Period:

Province:

Geotec.unit:

Tectonic complex: Rødingsfjelldekkekom

Igneous complex:

Group: Formation:

Mineralogy

Relationship Mineral Amount

Not defined Plagioclase Major mineral (>10%)

Not defined Quartz Major mineral (>10%)

Not defined Potassic feldspar Major mineral (>10%)

Not defined Biotite Subordinate mineral (1-10%)

Not defined Muscovite Subordinate mineral (1-10%)

Not defined Beryl Accessory mineral (<1%)

Not defined Fluorspar Accessory mineral (<1%)

Not defined Zircon Accessory mineral (<1%)

Not defined Tourmaline Accessory mineral (<1%)

Not defined Lepidolite Accessory mineral (<1%)

Not defined Amphibole Accessory mineral (<1%)

Not defined Amazonite Accessory mineral (<1%)

Structures

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

Wall rock Foliation Strike/Dip :270 / 70 Pre-mineralisation

Information(s) in free text format

Free text

4-5 mindre dagbrudd i retning NV-SØ. Området er overdekket, men det synes som om det er uregelmessige linser, eller en ikke sammenhengende gang av pegmatitt. Bruddene er maks. 5-6 m brede, og dette reflekterer trolig bredden på mineraliseringen. Bredden kan følges over 70-80 m. Gangen kutter foliasjonen i de omliggende glimmerskifre. Pegmatitten er grovkornig (1-30 cm) og kalifeltspat-dominert. Skriftgranitt-tekstur er vanlig. Kvarts og kalifeltspat er tett sammenvokst, og det er vanskelig å finne helt rene kalifeltspat-partier. Hovedmengden er kalifeltspat, kvarts og plagioklas, men pegmatitten er relativt mineralrik og underordnede mengder (1-10%) av biotitt, muskovitt (lys grønn glimmer) og amfibol fins. Aksessoriske mineraler er beryll (grønn/blå), turmalin (svart), flusspat (rosa-fiolett) og amazonitt (grønn/blå).

Bibliography:

References not to be found in NGU's Reference Archive.:

Meffert, 1943: BA-rapport 5114

Hesse, J., 1943: BA-rapport 5116

A/S Malmundersøkelser, 1943: BA-rapport 5117 og 5801

Sverdrup, T. L., 1970: BA-rapport 6224 (939C)

Era:	Paleozoic	Period:
Dating:		Method:
Genesis:	Hydrothermal vein	Form:	Irregular
Main texture:	Structureless	Min. distribution:	Massive (>50 % ore minerals)

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

Relationship	Mineral	Amount
Not defined	Plagioclase	Major mineral (>10%)
Not defined	Quartz	Major mineral (>10%)
Not defined	Potassic feldspar	Major mineral (>10%)
Not defined	Biotite	Subordinate mineral (1-10%)
Not defined	Muscovite	Subordinate mineral (1-10%)
Not defined	Beryl	Accessory mineral (<1%)
Not defined	Fluorspar	Accessory mineral (<1%)
Not defined	Zircon	Accessory mineral (<1%)
Not defined	Tourmaline	Accessory mineral (<1%)
Not defined	Lepidolite	Accessory mineral (<1%)
Not defined	Amphibole	Accessory mineral (<1%)
Not defined	Amazonite	Accessory mineral (<1%)

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Wall rock	Foliation	Strike/Dip :270 / 70	Pre-mineralisation