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Godejord geology

Skiftesmyr’s and Godejord’s relationship to a large magnetic anomaly

Godejord lies within the Limingen Group south of the Gjersvik Group. The area is composed of greenstones, mica schist, amphibolites, felsic tuffs,  phyllites and quartzites that have undergone Lower Amphibolite facies metamorphism. The area is mostly covered by overburden and swamps and few outcrops, except for old workings, exists near the mineralization. The rocks have undergone intense deformation  and the general foliation strikes E-W with a 60-70° dip towards north.

A simplified sequence over the main mineralization consists of three geological units. The base is composed of massive mafic flows and dykes (greenstones). Stratigraphically above this unit an altered  quartz-sericite and quartz-albite rich rock occurs, which hosts the main mineralization. This altered rocks also contains varying amounts of epidote, carbonates and calc-silicates (tremolite-actinolite mainly). The hanging wall is composed of a quartzite (exhalite) with ± magnetite ± sulphides ± pink garnet. Increased concentration of the magnetite forms a Banded Iron Formation (BIF) which can be traced for many kilometres both towards east and west. There are some rare sulphides associated with the main mineralization: mawsonite, mckinstryite, stromeyerite and one unnamed silver-copper-tellurium sulphide1, 2).

Historical resources and reserves

(note: The information below is based on a historical resource and mine plan from Braddick Resources Ltd’s pre-feasibility study in 1996 and are not up to NI 43-101 standards)

Godejord was mapped in the 1970’s, 1980’s and 1990’s. Geophysical methods, geochemical sampling and drilling were used by Grong Gruber, Norsulfid, Nord-Trøndelag county/NGU, and the Norwegian Geologiske Tjenester. All together 48 holes, with a total length of 6,370 meters, were drilled. Mainly the base metals copper and zinc were analyzed, while the mineralization of Silver and Gold was mapped to a lesser extent.

3D model of the Godejord deposit at 1% cut-off. NGU report no. 96.024, 1996 by
Tor Grenne and Eyolf Erichsen. The scale of the workings are exagerated compared
to the scale of the model. View is seen from southeast.
The Godejord deposit shows high average zinc grades and fairly high average copper grades, concerning a deposit of this type. They are 4.2 % regarding zinc and 0.57 %, concerning copper at 1 % cut-off3). Average grades as regard gold and silver at 1 % cut-off amount to 0.36 ppm and 16 ppm, respectively. The silver grade is considered to be relatively high, whereas the gold grade is considered to be rather low, in this context. Lead shows grades of 0.13%. The deposit contains an ore resource of 0.25-0.3 million tons in situ at 1 % cutoff.

The economically mineable ore, excluding ore left in pillars and including a certain amount of barren rock dilution, is 76,221 tons, according estimations by Outokumpu/Norsulfid in 1992. The average grades are 0.76 % copper, 7.8 % zinc, 24 ppm silver and 0.83 ppm gold at 1 % cut-off.

With an effective mining operation and current price levels, the Godejord deposit can become an attractive reserve in a combined Skiftesmyr/Godejord operation. As with Skiftesmyr, Godejord is now under an exploitation license and is valid until 2027.

 

Godejord grades

Cut-off, copperequivelent1)
 
Copper
Zinc
Lead
Gold
Silver
Ton, mill.
(%)
(%)
(%)
(ppm)
(ppm)
Resources, 1%
0.25-0.30
0.57
4.22
0.13
0.36
16
Resources, 2%
0.10-0.12
0.76
6.89
0.22
0.78
20
Reserve, Mineable ore, 1%
0.08
0.76
7.76
n.a.
0.83
24
 

 

 

 

 

Historical work done on Godejord

 
History of geo-related work
Drilling
 
Method
Company
Year
No. of holes
Length (m)
 
 
Geological mapping, geophysics,
Geochemistry,
drilling
NGU
1971-1973, 1989, 1993-1994
2
 
 
Geological mapping, drilling, Metallurgy,
geophysics
Grong Gruber AS
1973-1992
19
 
 
Geophysics, drilling, resource calculation
Norsulfid AS
1991-1993
25
 
 
Geological mapping, trenching,
Drilling, pre-feasibility study
Braddrick Resources Ltd
1996-1997
2
 
 
Geological mapping, trenching
MetPro AS
2010-2012
 
 
 
Total
 
 
48
6370m
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1)     Bv-4640, Bernard L.M., 1997. Prefeasibility study of the Skiftesmyr and Godejord copper zinc projects, Grong, Central Norway. Rapportarkivet, Bergvesenet, N-7441 Trondheim.
2)       Bergstøl S. and Vokes F.M., 1974. Stromeyerite and Mckinstryite from the Godejord Polymetallic Sulphide Deposit, Central Norwegian Caledonides. Mineralium Deposita, 9, pp. 325-337.
3)       The cut-off refers to % copper equivalents based on 1996 metal prices. A cut-off is the minimum grade of metal, below which the material is considered to be uneconomical to mine and process.