Sillitoe, 2010 - Avala Resources Ltd.

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Anatomy of a hydrothermal breccia that vented to the surface Hydrothermal breccias that breach the surface some@mes are called diatremes. However that term is largely reserved to breccias formed from magma@c or phreato-‐magma@c processes whereby magma expands catastrophically to excavate a conical crater. In hydrothermal and magma@c-‐related breccias, the excavate cone is filled with material that was not ejected and that falls back into the crater. Breccia facies are similar to those in hydrothermal breccias but in magma@c breccias there is juvenile material in the form of irregular ameboidal shaped clasts. Permeability will be greatest along the breccia margins, or where mul@ple breccia@on events are superposed. The cri@cal criteria required to dis@nguish interac@on with magma is the presence of the juvenile clasts.
KUDD-‐009 KUDD-‐ 005 Kuruga breccia facies placed in context of simple hydrothermal breccia Clas@c rock with 0.5 ppm Au; KUDD-‐009 Tuffaceous horizon @32m; KUDD-‐009
Page 1 and 2: Thought on the porphyry poten-al be
Page 3 and 4: Sillitoe, 2010 What is seen in the
Page 5 and 6: Sillitoe, 2010 Kuruga KUDD-‐034
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Page 9: Anatomy of a hydrothermal breccia I
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Page 17: Some concluding thoughts 1. Clearly

Sillitoe, 2010 - Avala Resources Ltd.

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