The miner said the sale is expected to conclude on November 25.
"The company received confirmation over the weekend, from Mercuria, the company's offtake partner, that the sale will conclude on this date, following a delay from the previously anticipated schedule, due to availability of the nominated independent technical inspectors who are required to be present on-site on behalf of the buyer in order to release the shipment," it added.
Vast said October 7 that it had resumed operations at Baita Plai after replacing a steel railway bridge that connected the mine to the flotation plant. The safety concerns with the previous structure is what put the first sale to Mercuria on hold.
Baita Plai, in the Apuseni Mountains of Transylvania, has a 1.8 million-tonne copper-silver-zinc-lead-gold-tungsten-molybdenum ore body at a 6% copper equivalent within the mining licence area.
Mine officials said earlier this year that they were targeting a date before the end of the years for the completion of the development of the lower underground level at the mine.