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	THE ORE DATABASE
	Deposit Area 237 - 100
	(Last updated 01.mar.2005)

Importance

Public:

Little Importance (reg. 18.02.2015)

Economical:

Minor interest , (Confirmed 27.jan.2005 by Havard Gautneb)

Mineralization

	Era:	Proterozoic	Period:	Neoproterozoic
	Dating:	663 (-7\+7) million year	Method:	K/Ar
	Genesis:	Hydrothermal vein	Form:	Plate
	Main texture:	Fracture filling	Min. distribution:	Irregular (scattered)

Main grain size:

Medium grained (1-3 mm)

Main alteration:

Sericitisation

	Strike/Dip:	203 / 70	Direction:
			Plunge:

Stratigraphic classification of host rock

Era:

Proterozoic

Period:

Paleoproterozoic

	Province:	East Norwegian Basement Province
	Geotec.unit:	Solør Complex
	Tectonic complex:	Mylonite Zone
	Igneous complex:

Group:

Formation:

Mineralogy

	Relationship	Mineral	Amount
	Gangue mineral	Quartz	Major mineral (>10%)
	Gangue mineral	Sericite	Subordinate mineral (1-10%)
	Ore mineral	Pyrite	Major mineral (>10%)
	Ore mineral	Chalcopyrite	Major mineral (>10%)
	Ore mineral	Pyrrhotite	Accessory mineral (<1%)
	Ore mineral	Sphalerite	Accessory mineral (<1%)
	Ore mineral	Galena	Accessory mineral (<1%)
	Ore mineral	Hematite	Accessory mineral (<1%)
	Ore mineral	Molybdenite	Accessory mineral (<1%)
	Ore mineral	Gold	Accessory mineral (<1%)
	Ore mineral	Magnetite	Accessory mineral (<1%)

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Fault plane	Strike/Dip :188 / 80	Syn-mineralisation ;...Effect :Controls
	Host rock	Fault plane	Strike/Dip :203 / 70	Syn-mineralisation ;...Effect :Controls
	Host rock	Foliation	Strike/Dip :318 / 60	Pre-mineralisation ;...Effect :None
	Host rock	Foliation	Strike/Dip :324 / 70	Pre-mineralisation ;...Effect :None

Information(s) in free text format

Free text

The mine is situated in the western hillside 50 m due west of the Guldkis-Brustad dirt road and on the western side of the NNE-SSW striking Holsjøen-Lesja fault zone which follows the river west of Lesja farm. The mine comprises two interconnected open pits with widths up to 10 m, total length reaching 37 m and a depth exceeding 7 m. One adit leads into the bottom of the southern pit where several drives and cross-courses have been constructed. The northern pit contains a water-filled shaft at the end of a deep trench through the hillside. The pits were worked along a 0,5-3 m wide vein of milky quartz running parallel to the Holsjøen-Lesja fault zone that is characterised by clay-altered brick-red wall rocks veined by fine-grained chalcedonic quartz. The steeply west-dipping vein bifurcates in the southern part of the mine where NE-SW and N-S striking branches occur. The veins intersect pink medium- to coarse-grained gneiss granites of the Solør complex. The gneisses surrounding the veins contain abundant thin veins and veinlets of quartz, but show with a few exceptions only weak sericite alteration. Though the mine was worked along the main quartz vein no significant mineralisation of sulphides and gold is presently found. The most prominent auriferous mineralisation occurs related to a fault which in the south follows the western contact of the quartz vein before crossing into the gneiss granites towards the NNE. Both the quartz vein and the gneisses along the fault are strongly brecciated and fractured with a grey to nearly black colour caused by variable abundance of black carbon-coated fractures containing minor pyrite, calcite and quartz. These black carbonaceous rocks contain up to 10 % of total carbon and analyses yield up to 7 g/t Au in spoil-heap samples carrying dissiminated pyrite and pyrite-quartz veinlets. Pyrite-rich carbonate-chlorite-sericite alteration is locally developed in the hanging-wall of the steep westerly dipping fault. Samples of the pyrite-sericite alteration contain up to 9 g/t Au. Microscopic examination of this alteration show abundant pyrite with micro-fractures and inclusions containing accessory amounts of native gold (10-20 mm) partly intergrown with chalcopyrite, sphalerite, galena and/or hematite. Hematite is often found associated with red stained chalcedonic quartz veins similar to those along the Holsjøen-Lesja fault zone. These veins are observed to cross-cut the b

Name of Locality : Kat skjerp

(Object Id : 0237,100,01,00)

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Location

County :

Akershus (02)

Municipality :

Eidsvoll (0237)

Map 1:50000:

Eidsvoll (1915-1)

Map 1:250000:

Hamar

Marking point:

Longitude:

11.3577990

Latitude:

60.3932170

(Unavailable)

X-coord:

m.

Y-coord:

m.

Commodity

	Main Type:	Precious metals (Au,Ag,PGE)	Sub Type:	Gold
			Element(s):	Au Fe-sulphides

Production

	Activity:	Pitting	Reserves:
	Prod. method:	Open pit mining	Production:
	Prod. status:	Disused, closed	Volume of dump:	40 m3

Structures

	Location:	Type:	Orientation(360 gr.):	Relation to min.:
	Host rock	Joints/Fractures	Strike/Dip :42 / 90	Syn-mineralisation ;...Effect :Controls
	Host rock	Hydrothermal vein	Strike/Dip :188 / 70
	Host rock	Fault plane	Strike/Dip :188 / 75	Syn-mineralisation ;...Effect :Controls

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The fact sheet was created on 22.11.2024

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

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