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Gold/Mining/Energy : Donner Minerals (DML.V)

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To: VAUGHN who wrote (9669)	11/24/1998 10:06:00 PM
From: 1king	Read Replies (2) of 11676

Vaughn, I was a bit confusing regarding the nickel content and grade. The Ni grade of the sulfide making up the massive sulfide is lower than the Ni grade of the sulfide making up the disseminated sulfides. This is important because it points to multiple "events"...mineralzing and/or magmatic? Therefore, I would not call the deposits remobilized. They represent a later "pulse", maybe the "last-gasp" of a system "choked" (e.g. vertical plumbing system of kilometer scale) with massive sulfides unable to be mechanically transported earlier because of fluid mechanics. The density of the sulfide fluid versus the velocity of the host magma. There are other mechanical and/or chemical theories as well. As you stated the disseminated ores do not seem to make the "grade" so to speak in terms of ore bodies. This is a bit of a generalization but it does cover a lot of prospects in Labrador. However, I would have to say that there are TWO distinct disseminated sulfide groups in Labrador, those related to the anorthosites and those related to the gabbros/olivine-gabbros. They are certainly different in terms of chemistry and metal potential. I don't want to underestimate the significance of disseminated ore at Voisey. Looking for massive associated with roots is the MO because of the mechanism I described above. The later pulse (massive) seems to be spatially related to the conduits used by the initial magmatic activity. Whether or not it is a reactivated structure or they occur close enough in time that the system remains mechanically active is a point of debate. Regardless, the second massive pulse in most instances (emperically) is spatially related to the narrow part of the system....i.e. the plumbing where it approaches the magma "chambers". Remember the density of the massive and the velocity of the magma. The velocity is proportional to the size of the conduit (the area of the conduit....e.g. diameter of a pipe). So as the diameter of the conduit expands the velocity drops and the sulfides slow and cool (settle..sort of). There are other instances where secondary or even tertiary structures occur in the country rock and it is thought that these are "leaks" in the massive system. These may or may not be related to the high-grade veins we see at north and south Voisey. They have SFA in PGE's but that seems to be the rule rather than the exception. I have tried twice to draw up a 3-D and quit out of frustration, so don't look for it in the near future. 1King P.S. Osprey this stuff is usually simple physics stuff with lots of bullshit geo-words to fancy it up. Any questions I can try to clarify them. Many times I am just trying to draw a visual image rather that follow strict models, so any geo-types out there who do not like what I am saying can come here and help us or pogues mahone!

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