ASX-listed engineering group, Primero Group has increased its shareholding in unlisted, Gawler Craton-focused Barton Gold with a view to collaborating on enhanced processing opportunities at Barton’s South Australian gold projects when they spring back to life. Primero, Barton’s preferred services provider for the turnkey design, construction and operation of mine processing infrastructure, will focus on the re-start of the Tarcoola mine.