Southern Silver Substantially Increases Zinc Recoveries and Grades in New Metallurgical Test Results; Generates Separate Copper Concentrate https://www.newsfilecorp.com/release/38738/Southern-Silver-Substantially-Increases-Zinc-Recoveries-and-Grades-in-New-Metallurgical-Test-Results-Generates-Separate-Copper-Concentrate Vancouver, British Columbia--(Newsfile Corp. - September 19, 2018)