Peregrine Diamonds Ltd. PGDIF

Question for XDeBeers

[ekim]

On the latest PDAC presentation -- PDAC Presentation

On page 16.
Right side,
it shows the layout of the different domains within CH-7.

At the top of the image, it mentioned 'Precursor Dyke'.

What does that mean? Precursor?
Can you infer what they mean in reference to the image?

TIA.

EKIM

[maintenance1]

Are pipes not fairly uniform in their diamond distibution? If so, what could explain the differences  in CH-7's kim's 1 through 5? Is this different pipes coming together at surface? Does kim 5 continue down to the north east? 

[xDeBeers]

Most pipes, but not all, are variable in their diamond distribution. There are quite a few different rock types (facies) within a kimberlite. Tuffaceous (=crater facies), Hyperbyssal (~fresh) are the main types, and there are a few others. There can also be different phases = pulses of magma that have different diamond content. The cooling rate of each rock type is important. The faster the better

[xDeBeers]

The precursor dike can be one of three things in the absence of more information. 1. the root zone of the kimberlite. That is a kimberlite dike from which the pipe erupted upward. 2. A kimberlite dike that is closer in age to the pipe. ie it erupted around the same time and reached the surface. 3. A non-kimberlite dike that was a weaknesss that the kimberlite exploited to get to the surface. We