Canadian Mining Journal

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DIAMONDS: Airborne data gets closer look

YELLOWKNIFE: Margaret Lake Diamonds Inc., a diamond exploration company focused on the Northwest Territories, in conjunction with its geophysical consultants, Campbell and Walker Geophysics Ltd, has completed a review of airborne gravity...



YELLOWKNIFE: Margaret Lake Diamonds Inc., a diamond exploration company focused on the Northwest Territories, in conjunction with its geophysical consultants, Campbell and Walker Geophysics Ltd, has completed a review of airborne gravity gradiometry (“AGG”) data which was acquired for the Margaret Lake property in late 2014.  The data review has identified 12 high priority targets that require evaluation by drilling.

The property is comprised of 19 mineral claims totalling 19,716 hectares (48,720 acres) and is located 300km east-northeast of Yellowknife. The targets were selected from more than 60 distinct gravity anomalies generated by the AGG survey.  Targets were given priority based on anomaly strength, shape, and structural setting. 

A HeliFALCON® gravity gradiometer system combined with airborne magnetics was flown on 75 metre line spacing at an average 45 metres above terrain.  A digital terrain model together with detailed bathymetry, using WorldView2 high-resolution satellite imagery, was then applied to the gravity data.  Bathymetry is required to distinguish the effect of water depth on the gradient signal, which can generate false kimberlite-like anomalies.

The company and its consultants believe this is the first time satellite bathymetry data has been applied to gravity data in the process of mineral and diamond exploration.  

More information can be found at www.margaretlakediamonds.ca.