Fastmarkets MB, page-6

it was stated as a forward sale which is pretty standard in resource industry and there was literally a photo of a whole bunch of concentrate in the shed at Karumba

"The forward sale of 20,000t of zinc concentrate during the month of September has generated revenue of $27.2M for the operations, providing the Company with first operational cashflow and full confidence of the continuing sales for all of New Century’s concentrate production."