I sent an e-mail to Sasha last week asking him that question.

This was his reply:

Yes cores are cut in half. Half is sent to the lab and the other
> stays in storage to be kept on record - kind of like the negative for a photo.

>
> When there is VG on the core, we try to split it down the middle as
> much as possible so that we get an accurate representation of what
> is happening. At the end of the line, we now we are getting an
> average of 2g/t at the drill bit which underestimates the grade.

>
> Thank you,
>
> --
> Sasha Asgary