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Gold/Mining/Energy : Medinah Mining Inc. (MDHM) -- Ignore unavailable to you. Want to Upgrade?

To: Mike Gold who wrote (18736)	9/8/1999 10:13:00 AM
From: Mike Gold	Respond to of 25548

Of Breccia Pipes and Men: In case you don't remember previous posts-a little discussion on sizes of breccia pipes is in order. It is my understanding that IP results from Geodatos at Lipangue should be out soon. We should have a better idea on exactly how many pipes we have and how deep they go-whether they extend to the limit of the IP survey depth which in this case is 1200 meters. "Magmatic-hydrothermal breccias are products of the release of hydrothermal fluids from magma chambers, irrespective of the original source of the fluids concerned." "The intrusion-related breccias under consideration here are restricted to pipes that may occur individually or in closely spaced clusters of up to 200 or more. Pipes are generally roughly circular to ovoid in cross section and posses vertical dimensions which are observed or inferred to be several times greater than their maximum horizontal dimensions.. Horizontal dimensions are commonly in the range of 50 to 300 m but are as great as 1300 X 900 m at Kidston, 2 X .7 KM for the composite pipe at Los Bronces or as little as 3 m in the Cabeza de Vaca District. The full vertical extent of a pipe is nowhere observable, although minimum vertical dimensions of 725 to 860 m are known for four districts. Unless titled subsequent to emplacement, pipes are only uncommonly inclined at more than 15 deg from the vertical."- "The contacts between breccia pipes and their wall rocks are commonly abrupt, and in may cases, marked by a zone of closely spaced vertical fractures (or sheeting) 1 to 5 meters wide." (Remember hole 4? :) ) "However, <50 percent of breccias in any cluster of pipes are ore bearing, a characteristic that has often frustrated the explorationist" (Opps-lets hope we beat the odds!) "Breccias are reported from 50 to 60 percent of porphyry systems." (ie all things being equally-Lipangue has greater than a 50% chance of a porphyry deposit at depth.) "The breccias range from minor adjuncts to deposits to the economically dominant parts of some porphyry systems."ie Los Bronces.-Richard Sillitoe Enough for now. Cheers.