Adding my take on the background:

Gold Reserve with it's concession was the impediment to Venezuela getting it's cake and eating it too.
Plain expropriation would have been ideal after mine construction but was out of the question because it was a slam dunk for an ICSID case.
They realized it at the last moment and withheld the Initiation Act.

Crystallex having a contract while the resource was owned by Venezuela, was partially accomplished.

Rusoro must have done an under the table deal with Venezuela to get the 'Most Favoured' status and partner up through Venrus. The writing of a deal is in the price that was obtained from Rusoro's gold sales. Through this deal Venezuela hoped that Rusoro would buy out Gold Reserve and solve that problem for them. I suspect buying out Crystallex's contract afterwards was probably in the works also.
With the Rusoro buy-out of Gold Reserve a flop, Venezuela was forced into this "Sell The Gold To Me" law as a last resort to that end

Jmho.