Metallurgical test work from the Brewery Creek project in the Yukon shows estimated oxide gold recoveries of between 77.9 and 82.9 percent, Americas Bullion Royalty Corp (TSX:AMB) said Thursday.
As quoted in the press release:
The results of the test work indicate that significant increases in gold extraction over the previous operation can be achieved from oxide material after crushing to a nominal size of 80% passing 9.5mm. The results also show that additional gold extraction can be achieved from the existing heap leach material after crushing. The 4 preliminary column tests from the Classic zone show that the syenite host rock which was not mined in the previous operation is likely amenable to gold extraction through the heap leach process.
The open-pit mine operated as a heap leach operation from 1995 until the early 2000′s, and achieved recovery rates of around 60 percent without crushing. The recent study indicates that oxide gold recovery rates can be significantly enhanced by crushing.