Tinka Drills 10.8 Metres Grading 16.7% Zinc At South Ayawilca; Zinc Resource Update By November 2017 https://www.tinkaresources.com/news/tinka-drills-10-8-metres-grading-16-7-zinc-at-south-ayawilca-zinc-resource-update-by-november-2017 September 18th, 2017