VANCOUVER, British Columbia, April 19, 2021 (GLOBE NEWSWIRE) -- NorthWest Copper Corp. (TSX-V: NWST) (“NorthWest Copper”) is pleased to announce positive results for initial metallurgical test work on its 100% owned Stardust copper-gold project in BC. Combined gravity and flotation produced copper recoveries from 94.2% to 98.6% and gold recoveries from 93.0% to 93.9%. Those tests produced copper in concentrate grades from 21.8% to 26.2%. These strong results further enhance the high-grade Stardust deposit.

Peter Bell, President & CEO of NorthWest Copper states: “These exciting positive results support the advancement of our combined Stardust and Kwanika project. High grades, strong recoveries and a simple flowsheet provide a foundation for the combination. We are finalizing an initial Stardust resource in the next several weeks which will help underpin our unique high-grade copper-gold project.”

Three composites were tested: low, medium, and high grade. Tests were conducted with the high-grade composite including gravity, flotation optimization, rougher kinetics and grind size, then batch cleaner tests. Finally, the low and medium grade composites were tested using parameters from the previous tests. These tests used a primary grind size of 150 microns with a 40 to 50 micron regrind, gravity and flotation. Summary results are shown below.

Sample Cu grade % Au grade g/t   Cu recovery   Au recovery   Cu grade in concentrate  
High Grade 3.94 % 4.56 g/t   98.6 % 93 % 26.2 %
Medium Grade 2.13 % 2.36 g/t   94.2 % 93.7 % 21.8 %
Low Grade 1.11 % 1.30 g/t   94.4 % 93.9 % 22.2 %