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ultramafic

   Also found in: Encyclopedia, Wikipedia 0.02 sec.
ul·tra·maf·ic  (ltr-mfk)
adj.
Ultrabasic.

ultramafic  (ltr-mfk)
Containing mainly mafic minerals. Used of igneous rocks and often used interchangeably with ultrabasic. Dunite is an ultramafic rock.


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Rubicon is also starting a 5,000-metre drill program on its wholly-owned McFinley project, targeting a four-kilometre-long gold-bearing ultramafic rock under Red Lake.
One drill hole will test the NW trending contact between the layered ultramafic intrusive unit and Takla volcanic rocks along the southwestern margin of the structural corridor.
In his letter of September 16, 2005, he notes: "The leases are underlain by the Kidd-Munro lithostratigraphic assemblage, a belt of ultramafic, mafic and felsic rocks, extending from the Kidd Creek area north of Timmins to the Ontario-Quebec border.
 
 
 
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