London-listed NQ Minerals said it achieved excellent results from its tailings reprocessing operations at the Hellyer Gold Mine in the June quarter despite the coronavirus pandemic.

"Major plant upgrades and process optimisation plans were implemented at Hellyer in the last week of June 2020, which successfully increased plant throughput by 44 per cent to a rate of over 1.3 million tonnes per annum, compared to 2019's full year plant production numbers," the company said.

Describing June quarter concentrate production levels as excellent, NQ said its unaudited revenue from mining operations totalled $30 million for the half-year.

"Hellyer's lead concentrate production for quarter two totalled 8762 tonnes and zinc concentrate production totalled 4241 tonnes," NQ said.

"In addition, NQ advises that a total of 1223 ounces of gold and 229,947 ounces of silver were produced as payable precious metal credits in the lead and zinc concentrate streams for the quarter."

Chairman David Lenigas said: "NQ's Hellyer operations have performed extremely well last quarter, especially considering the current global COVID-19 pandemic."

"COVID-19 represents an unprecedented challenge for people, governments and businesses worldwide.

"The Tasmanian government responded quickly to the virus and was the first state in Australia to limit any travel to its island state and has implemented strict controls within the state."

He said the June production rate increase at the processing plant would have "a very significant and immediate impact on future revenues".

NQ this month raised $1.65 million through the issue of shares for working capital and to speed the reopening of Beaconsfield.

It completed a $2 million acquisition of the historic mine in late June.