Sillitoe, 2010 - Avala Resources Ltd.

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What type of breccia underlies the northern part of the Kuruga property? Insufficient knowledge is available regarding the original style of breccia that forms the northern part of Kuruga. Drill hole KUDD-‐009 appears to have drilled into the top of a breccia body, whereas KUDD-‐005 was collared within a breccia margin. The laqer drill hole was collared at higher eleva@ons, and shows evidence of mul@stage breccia@on. An important observa@on is that the dominant clast in the breccia is silicified rocks, and thus essen@ally country rocks. Hence, trea@ng the breccia as a series of nested largely hydrothermal breccia lacking obvious magma@c input seems to be the most reasonable model at this date. Recognizing the mul@stage evolu@on of the breccia poten@ally is important, and should be clarified as it may play a role in mineraliza@on.
Some concluding thoughts 1. Clearly there is evidence for considerable hydrothermal ac@vity at Kuruga. There is a deep porphyry evident as well as extensive hydrothermal breccia present. 2. Gold in the lithocap is stratabound within a permeable tuffaceous horizon as well as within the crackle and jigsaw margins of the breccia. 3. Copper in the lithocap is associated with a second (or third?) stage of breccia@on and is associated with enargite-‐pyrite cement. 4. No evidence has been seen to date to indicate that the breccias have a magma@c component. If this is true, then they represent the catastrophic volume expansion of the hydrothermal fluid. If this is true, there is no need for them to be located over the top of a porphyry-‐style intrusion. Instead, they can be lateral to the intrusive center. 5. The evidence for intense and pervasive K-‐silicate altera@on in the deep drill demands a porphyry center at depth, as would be expected. What is not know is whether it is mineralized as well. A drill hole into the main part of the likely porphyry is warranted. 6. Judging from the depth of sulfide in drill core and in the nearby Lipa system, the sulfide in the porphyry center is likely to begin around depths of 650 m RL, and extend to depth. This depth approximately corresponds to the depth of extensive and not overprinted K silicate altera@on in KUDD-‐034.
Page 1 and 2: Thought on the porphyry poten-al be
Page 3 and 4: Sillitoe, 2010 What is seen in the
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Page 9 and 10: Anatomy of a hydrothermal breccia I
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Sillitoe, 2010 - Avala Resources Ltd.

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