Case Studies - Mineral Exploration

GEOTEM Survey in Sweden Storliden Deposit

The Storliden Cu-Zn VMS Deposit (10% Zinc, 4% Copper) was discovered by drilling in March 1998 as follow up of a GEOTEM survey carried out in 1997. The deposit is located 8 km NE from the city of Malå in the Skellefte Mining District of Northern Sweden. The deposit top is at a depth of approx. 130 m, including approx. 20 m of glacial till overburden. Strong EM Response on all 24 channels (12 channels Z-Axis and 12 channels X-Axis) Coincident positive magnetic anomaly Interpreted conductor geometry. Dip direction SW Dip angle < 30° Analysis of the Z and X axes GEOTEM data indicates that the GEOTEM response is primarily from the deep-seated,sub-horizontal massive Cu-Zn sulphides and not the stringer sulphide zone which sub outcrops.

Survey Data Discovery Line Profile

 Geological Section of the Storliden Deposit

• Strike length: 400 metres
• Width: 100 metres
• Average Thickness: 8 metres
• Mineralisation: Sphalerite, Chalcopyrite, pyrrhotite.

GEOTEM Survey Specifications

• 75 Hz Waveform Frequency
• 2 ms Pulse Width
• Flight Line Direction NE-SW
• Flight Line Spacing 200 metres

North Atlantic Natural Resources AB (NAN) has given permission to present the data, and we especially acknowledge the support of E. F. Posey.

Fugro Airborne Surveys is pleased to have carried out this airborne GEOTEM survey for NAN.