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Gold/Mining/Energy : Winspear Resources
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To: George J. Tromp who wrote (6114)6/21/1998 12:59:00 PM
From: E. Charters  Read Replies (1) of 26850
 
Well there is little to be said but lots to address
I guess after the plethora of directions of thought
presented.

BUT is it true the dip is only 15 degree and the
thickness under 3 metres? This will be some hard to
mine. How would you do it? Open pit? modified room and
pillar? Vertical crater retreat? It would be dicey. Not
impossible but not a sinecure.

IF the train is practically square it points to an
immense rafting or a nearby up ice source. I would
fence it off and do RC drilling eastwards. Source has
to be within 6 kilometres. (the CDN average is 6 miles
for ALL float occurrences. In a fan source is generally
no further than the width. So 2 kliks is the preferred
direction and anything in between. The possibility
remains of a completely or near completely eroded
source or a far rafting (remote).

There are nearly always several ages of vent and sill
emplacement. Near all kimberlites pipes are in dyke
systems with multiple ages of hypabyssal dyke and
multiple ages of diatreme emplacement and multiple
facies and ages of diatremes within the diatreme. Not
to mention multiple chemistries of emplacement from
barren alnoite to kimberlite to lamprophyre.

Along the dyke-fault sometimes for 100's of miles (here
you are getting the stuff the NT CDN explorers don't
know for the most part) the kimberlites emplace
themselves in usually continental drift direction (N.E.) getting
younger as the continent moves over the non moving hot
spot generator. As you go North East in the NT the
kimberlites age younger. The same in Namibia. WSP may
be able to identify the fault sources and follow them
if they knew how to identify faults. (VLF, gravity,
topography, mag.) Parallel to the 186-peninsula zone
would be "source" fault if it exists. The regional type
of lateral sheet emplacement points to the likelihood of
another sill as the source of the south east boulders.
(not necessarily but probable if thrusting is the rule
here) This would be hard to identify by geophysics
because of its flat dip. Werner type mag filtering
might help here. (I don't know, as Teskey about that
filter.)

The fact the the sills so far are breccia types point
to them as the venting source itself. If that is the
venting then it is probable that no pipes formed. Not
written in kimberlite but a strong possibility.

echarter@vianet.on.ca

The Canadian Mining Newsletter
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