Green Critical Minerals (ASX:GCM) completed construction and advanced commissioning activities at the VHD Technology pilot plant in New South Wales, according to a Thursday filing with the Australian bourse.

Given the early completion of the plant's construction, the mineral firm now expects prototype graphite blocks to be processed via VHD Technology by February, the filing said.

The company's shares surged almost 29% in recent Thursday trade, hitting a new 52-week high.