Mike,
Off topic, but perhaps of interest to you.
From my post on SW:
Author: teevee -- Date:2000-08-20 10:59:02
Subject: Diamond opportunities:-))
DH,
If the dyke trends NE, as it seems to be doing, then for sure it is going onto SUF property,
A geological "rule of thumb" suggests that the kimberlite could reasonably be expected to continue for half as far again. That would extend the dyke well onto the DSP and SUF claims.
also stated is that the grade seems to be increasing with the downdip, is this because of proximity to the "source".
A good way to see the trend of the grade is to perform a (thickness x micro diamond count/100) calculation for the grid squares and contour the numbers( I used the maps and data from the May 15 and August 10 press releases and contoured at >50, >30, >25). Then draw a best fit line best representing the axis of the contours. The highest (grade x thickness/100) all occur within a 1000 meters of the north shore of Snap Lake and the axis through the contours trends north-east to the S.E. and S.W. corners of the DSP and SUF claim blocks respectively. The spacial relationship between these features and the Snap Fault fault zone is highlighted by this exercise. The Snap Lake kimberlite sheet must be associated with a deep seated structure/fault/plumbing system that acted as a magma conduit.
Another feature that is highlighted by the contouring are two lobes. These lobes probably indicate a N.W. trending structure that intersects the N.E. trending Snap Lake fault. Such an intersecting structure may have been instrumental in the thickening in this area of the Snap Lake dyke.
The Snap Lake fault is probably a very old structure as it is parallel to the 2.2 billion year age set of diabase dykes that trend to the north east. It seems reasonable that this old structure may have been reactivated during the late Cretaceous or early Tertiary when the kimberlite event occured.
If you believe the "trend is your friend", then performing this excercise is a must. An obvious inference one may draw from this exercize is that the source is more likely to be a deep seated, north-east trending fissure of considerable length, rather than a point source such as a pipe, and that this fissure is spacially related to and controlled by the ancient Snap Lake fault zone. Areas along this trend intersected by N.W. trending faults may be favored as areas where thickening of the dyke has occured. If so, then CJ's statement that the Snap Lake deposit could easily fit within the SUF claim block may well be prophetic. Another inference is that areas of greatest thickness are most likely to be similiar to blows on verticle dykes. A point source or single pipe source model for the Snap lake dyke now appears more ptolemaic than geologically reasonable, given the available data.
regards, teevee |
