https://biz.prlog.org/tag/base-metals/ base metals - Free business directory on PRLog.Org, latest companies listed first. 60 https://biz.prlog.org/Sierragroupinc/ Sierra Resource Group Inc. (OTC Bulletin Board: SIRG) is a copper mining company. Which owns 100% of the Chloride Copper Mine located near Kingman Arizona, Technical Reports and an Ni 43-101show confirmed resources between 30-100 Mlbs.Mon, 20 May 2013 22:26:53 GMT