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Gold/Mining/Energy : ECHARTERS -- Ignore unavailable to you. Want to Upgrade?


To: Diamond Daze who wrote (1308)11/9/1997 10:00:00 PM
From: Larry Brubaker  Read Replies (1) | Respond to of 3744
 
Chris: There were some very good discussions by geologists a while back on the IPM thread about how it could happen that Au and Pt. could be mixed together in the same sand. Like you, I am not going to go back and try to find them now. One of the geologists who participated in the discussion recently left the thread; fed up with the recent pollution by the subject of this thread.



To: Diamond Daze who wrote (1308)11/9/1997 11:29:00 PM
From: Bill Jackson  Respond to of 3744
 
Chris; over the ages there were many, many glaciations and when they melted they often formed ice locked lakes(lakes whose outflow was glaciated, and blocked). As the melt progressed it would melt the blockage and a huge area would drain. The grand canyon was cut by those flows repeated again and again, and in the far past when the canyon was shallow the flow spread far more widely and the flow cleaned up in some areas bare, and as it slowed and fanned out wherever it dropped the silt load, usually in backwater areas where the velocity fell. There were many of these fans, not only the grand canyon but in other places too(smaller)
I think Thall might be able to be more precise in this area than I.

Bill