The Assay TV catches up with Alex Langer, CEO, president, and director of Sierra Madre Gold and Silver Ltd. (TSXV: SM | OTCQX: SMDRF), a precious metals development and exploration company focused on evaluating the potential of restarting the Guitarra mine in the Temascaltepec mining district, Mexico, and the exploration and development of its Tepic property in Nayarit, Mexico.