GROC .004 NEWS December 14, 2016 /PRNewswire/ -- Great Rock Development Corp. (OTC: GROC) is pleased to announce the acquisition and development of the new Imagen Filter with the aim to create a new era in gold and platinum separation. http://www.otcmarkets.com/stock/GROC/news/Great-Rock-Aims-to-Tap-Multi-Billion-Dollar-Market-of-Gold-Tailing-Refinement?id=146974&b=y