The contract covers the first five years of concentrate production and includes a prepayment facility against concentrate deliveries.
The new agreement builds on the two five-year marketing and off-take agreements already signed with Traxys in July for the sale of all the lead and zinc concentrates produced at Hellyer.
The first offtake agreements included a combined US$10 million secured prepayment facility, which at the time provided flexible pre-production funding, enabling the company to complete the refurbishment of the Hellyer plant and the start-up working capital.
Hellyer's first concentrate was produced last week after the mine started operations in September.
The product was its first lead, gold and silver concentrate lot, which was delivered to Traxys under an earlier offtake arrangement.
NQ said payment from Traxys had been received, providing it with its first operational cash flow from Hellyer.
The company acquired Hellyer last year for A$20 million (US$15 million at the time) from private company Keen Pacific, which had bought the project in 2013 and operated it under its subsidiary Ivy Resources.
NQ non-executive chairman Brian Stockbridge said the newest offtske agreement completed the company's marketing arrangements for the Hellyer project and reinforced the strong partnership with Traxys.