2013 US Geological SurveyFound this blurb in a 2013 US Geological survey:
"Serbia forecast GDP growth at a rate of 1.0% for 2014 (International Monetary Fund, 2014, p. 54). The modernization and expansion plans by RTB Bor and at the NIS refinery are expected to strengthen the mineral industry in the short run. In the longer run, new projects in the nonfuel mineral sector, such as possible development of boron, copper, gold, and lithium deposits, are likely to provide a significant source of revenue to the Government and a boost to the GDP. Plans to rehabilitate the country’s infrastructure (including railways, roads, water supply, and wastewater treatment plants) are likely to attract increased foreign direct investment in the mineral sector and to increase interest in nonfuel mineral prospecting."
Under the title of "references cited", Erin Ventures was mentioned three times which I thought was pretty cool.