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.

Question: Who is adding the revitalization of the iron-ore minimg?
Answer: BHP Biliton, and China Union

Question: What happend with the additional 13 ultra-deep offshore blocks?
Answer: were demarcated

Question: How many years spanned these events?
Answer: 7

Question: How many minerals being mined  accounted  for some economic activity?
Answer: 2

Question: How many groups were investing?
Answer: 3

Question: What mineral are the investors supporting?
Answer: iron-ore

Question: How many years spanned from 2004 to the last auction?
Answer: 6

Question: How many blocks were there all together?
Answer: 30

Question: Which year was the least amount of blocks set to be auctioned?
Answer: 2011

Question: How many years after getting the license to auction did they start to auction the blocks?
Answer: 3

Question: How many companies won the licenses?
Answer: 4

Question: which famous gas station brand won a license?
Answer: Chevron

Question: How many auctions for exploration licenses were done between 2005 and 2009?
Answer: 2

Question: How many more blocks were going to be auctioned after 2009?
Answer: 13

Question: How many companies have been successful at winning licenses?
Answer: 4

Question: How many total blocks has the government divided the waters into?
Answer: 30

Question: In what years has Liberia already held auctions for the offshore waters?
Answer: 2004