Passage: Alluvial diamond and gold mining activities also account for some economic activity. In recent years , foreign investment from ArcelorMittal Steel, BHP Biliton, and China Union is aiding the revitalization of the iron-ore mining sector. Liberia has begun exploration for offshore oil; unproven oil reserves may be in excess of one billion barrels. The government divided its offshore waters into 17 blocks and began auctioning off exploration licenses for the blocks in 2004, with further auctions in 2007 and 2009. An additional 13 ultra-deep offshore blocks were demarcated in 2011 and planned for auction. Among the companies to have won licenses are Repsol, Chevron, Anadarko and Woodside Petroleum.
How many auctions for exploration licenses were done between 2005 and 2009? How many blocks were there all together? How many companies have been successful at winning licenses? How many companies won the licenses? How many groups were investing? How many minerals being mined  accounted  for some economic activity? How many more blocks were going to be auctioned after 2009? How many total blocks has the government divided the waters into? How many years after getting the license to auction did they start to auction the blocks? How many years spanned from 2004 to the last auction? How many years spanned these events? In what years has Liberia already held auctions for the offshore waters? What happend with the additional 13 ultra-deep offshore blocks? What mineral are the investors supporting? Which year was the least amount of blocks set to be auctioned? Who is adding the revitalization of the iron-ore minimg? which famous gas station brand won a license?