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Gold/Mining/Energy : Golden Eagle Int. (MYNG) -- Ignore unavailable to you. Want to Upgrade?

To: Mike Gold who wrote (11527)	7/30/1998 8:14:00 AM
From: E. Charters	Respond to of 34075

Placers occur in mostly young river valleys in mountainous terrane. The can occur in old systems where the erosion is complete but they are more rare and in glaciated terranes this is less likely. After the mass wasting of the mountains has advanced to where the soils have been moved away from the peaks largely but river energy is still high. placers form at the base of the mountain source and gradually move towards the delta. Movement is far less than was always expected. Sources are never farther than a few miles. In the Fraser River one could well wonder where the gold came from in point bars where the nearest known gold fields are many miles. What is increasingly found from the China to the Yukon is that point sources are the key to placers. It has been put forth that point sources may be the only sources of placers. Because the point source has not been derived cannot rule it out. I invariably could ascertain that in BC a young volcanic source regime existed no further than the nearest mountain top upon finding a placer. I documented 20 placers personally and in several cases their source veins were found within 3 miles. In the Ross Placer in California it was found that the river cut a large gabbroic intrusive that was cut by many gold bearing veins. The source locality of the gold was frequently known to the placer miners of Califoria. Although close to economic, the smallish veins could not compete with the enormously profitable placers. The myth that the motherlode source of the placers in California was never found is belied by the numerous and profitable underground veins that were worked particularly in the Motherlode area of that state. The precise or probable source(s) of the original discovery of 1849 could be found I daresay with modern geology, in the surrounding mountains within a year of looking. (Sutter's Mill) There is no guarantee that the source is economic in itself but it is probably so. echarter@vianet.on.ca The Canadian Mining Newsletter