This morning I sent an email to GBB, and they answered. Both are pasted below.

I realise GB Developments has substantial gold in the ground. That is why
I invested in your shares. I am concerned because those shares have now
dropped in market price to the point where my XXX shares are valued at
1/3 of what I paid. Please inform me of just why you have dropped Genivar
as consultants & hired another company. Was this because of slow
performance, with continued delays in producing a 43-101 compliant report?
Or perhaps personal or professional disagreement with their geologists? Or
lack of (perceived or proven) diligence on their part? If all work to date
has been performed as it should, why a further long delay to produce a
report? Is more drilling needed? Re-assays of existing drill cores?
Reassessment of the historic data? Since a report was to be released a
while ago, I assume enough data was thought to be available at that time.
Was this report produced, but thought to be inaccurate or lacking in some
way? Was a report produced which gave a figure thought to be too low by
management?
Any information on this would be welcome, beyond the bald statement of a
change in consultants.
Thank you

This is the reply, from Roger Thomas, the same day, today--

This is good news because it removes the uncertainty of 43-101 time line.
Genivar did a wonderful job on finding
us a massive mineralised structure but they do not have the personal to
complete the 43-101 in a timely fashion.
The change had absolutely nothing to do with lack of data. The stock price
has discounted us down below one million ounces now. This price now gives
us almost zero value for 76,000 metres of drilling over the past 2 years.

Regards,
Roger Thomas