19 March 2019
Nighthawk Gold Corp. is pleased to provide results from the latest metallurgical testwork on the Colomac Gold Project. Four bulk drill core samples were collected from 21 boreholes covering 7 mineralized zones within the Colomac and Goldcrest sills. The results are presented in Table 3 inthe full release and include a summary of test results from all three preliminary metallurgical studies now completed. Findings continue to reveal: a relatively uniform hardness for material tested to-date; that the rock is amenable to all standard gold recovery technologies; and using a combination of gravity and cyanide leach recovery processes, testing showed that gold recoveries for all six bulk samples tested to-date range from 96.3% on the lower-grade material up to 98.0% for the higher-grade material, representing a significant increase in recovery over historic production results of 88.1% (1994 to 1997).
Dr. Michael Byron, President & CEO commented, "So far we have tested six samples that cover a limited portion of the deposit, however we are extremely encouraged as we continue to see tremendous consistency in terms of grind characteristics, gold recoveries, and responsiveness to all standard gold recovery technologies. The current program was intended to broaden sampling both laterally, and to depth, and to test material from several other mineralized zones. The results have been exceptional and show a very strong consistency in physical characteristics throughout the seven zones tested to-date. We will continue to expand metallurgical testwork in 2019 to additional areas of the sills, including more bottle roll and column leach tests to address the potential heap leach option for Colomac."