Question: The Victor Diamond Mine is owned by the international corporation that operates in how many countries?

Context paragraphs:
De Beers: The De Beers Group of Companies is an international corporation that specialises in diamond exploration, diamond mining, diamond retail, diamond trading and industrial diamond manufacturing sectors.  The company is currently active in open-pit, large-scale alluvial, coastal and deep sea mining.  It operates in 28 countries and mining takes place in Botswana, Namibia, South Africa and Canada.  Until the start of the 21st century, De Beers effectively had total control over the diamond market as both a monopoly and monopsony of diamonds.  Opposition has since dismantled the complete monopoly, though De Beers is still a large shareholder and currently sells approximately 35% of the world's rough diamond production through its Global Sightholder Sales and Auction Sales businesses.

Victor Mine Aerodrome: Victor Mine Aerodrome (TC LID: CVM2) is a registered aerodrome located 0.5 NM north of the Victor Diamond Mine in northeastern part of the Kenora District which, in turn, is located in northwestern Ontario, Canada.

Catoca diamond mine: The Catoca diamond mine is the fourth largest diamond mine in the world, and is located in Angola.  The mine is owned by a consortium of international mining interests, including Endiama (the state mining company of Angola) (32.8% ownership), Alrosa of Russia (32.8%), Odebrecht of Brazil (16.4%), and the Diamond Finance CY BV Group (16.8%).  The mine is located on a kimberlite pipe.

Victor Diamond Mine: The Victor Diamond Mine is the first Canadian diamond mine located in Ontario, and De Beers' second diamond mine in Canada (after the Snap Lake Diamond Mine).  It is located in the Northern Ontario Ring of Fire, in the James Bay Lowlands 90 km west of Attawapiskat in the remote northern part of the province.  In June 2005, the Attawapiskat First Nation voted in favour (85.5%) of ratifying the Impact Benefit Agreement (IBA).  Construction of the mine began in February 2006 which created 3200 positions; mining and operations will create around 400 permanent positions.  The Victor Mine is an open-pit mine, with a processing plant, workshops, and an airstrip located on site.  By 2013-2014 royalties collected from De Beers Victor Diamond Mine amounted to $226.  At that time De Beers was continuing to pay off its "$1 billion investment to build the mine and from now until it closes, the company expects to pay tens of millions of dollars in royalties."

Jericho Diamond Mine: The Jericho Diamond Mine is a dormant diamond mine located in Canada's Nunavut territory.  Jericho is Nunavut’s first and only diamond mine.  It is located 420 km northeast of Yellowknife, Northwest Territories and is accessible by air all year and by winter road from Yellowknife.  The project was mined from 2006 to 2008, and produced 780000 carat of diamonds from 1200000 t of kimberlite mined from the open pit operation.  Over $200 million was invested in the development of the Jericho operations including the construction of a 2000 t per day diamond recovery plant, maintenance facility, fuel farm, and offices and accommodation for 225 personnel.

Williamson diamond mine: The Williamson Diamond Mine (also known as the Mwadui mine) is a diamond mine 23 km northeast of Shinyanga in Tanzania; it became well known as the first significant diamond mine outside of South Africa.  The mine was established in 1940 by Dr. John Williamson, a Canadian geologist, and has been continuous operation since then, making it one of the oldest continuously operating diamond mines in the world.  Over its lifetime it has produced over 19 million carats (3,800 kg) of diamonds.  The Williamson mine, once owned by its namesake Dr. Williamson and later nationalized by the government of Tanzania.  Since February 2009 the mine is mostly owned by Petra Diamonds, with 75% ownership, the government of Tanzania owning the remaining 25%.

Premier Mine: The Premier Mine is an underground diamond mine owned by Petra Diamonds.  It is situated in the town of Cullinan, 40 km east of Pretoria, Gauteng Province, South Africa.  Established in 1902, it was renamed the Cullinan Diamond Mine in November 2003 in celebration of its centenary.  The mine rose to prominence in 1905, when the Cullinan Diamond — the largest rough diamond of gem quality ever found — was discovered there.  The mine has produced over 750 stones that are greater than 100 carat and more than a quarter of all the world's diamonds that are greater than 400 carat .  It is also the only significant source of blue diamonds in the world.

Diamond Mine (video game): Diamond Mine is a video game first published by MRM Software for the Acorn Electron and BBC Micro home computers in 1984.  It was reissued by Blue Ribbon in 1985 and ported to other systems in 1985 and 1986.  Blue Ribbon also released a sequel Diamond Mine II at the same time.  Both games are similar to the 1982 arcade game "Anteater".  While the maze design, limited pipe length and non-stop movement make the first game more original, "Diamond Mine II" could be considered an "Anteater" clone.

Lac de Gras: Lac de Gras is a lake approximately 300 km north east of Yellowknife, in the Northwest Territories of Canada.  Lac de Gras was the centre of the diamond rush of the 1990s.  There are three working diamond mines in the area, Diavik Diamond Mine, Ekati Diamond Mine, and Snap Lake Diamond Mine.  It was called Ekati by aboriginal peoples.

Murowa diamond mine: The Murowa diamond mine is a diamond mine located in Mazvihwa, south central Zimbabwe, about 40 kilometres from the asbestos mining town of Zvishavane in the Midlands province.  The mine is majority owned and operated by the Rio Tinto Group, which also owns the Argyle diamond mine in Australia and part of the Diavik Diamond Mine in Canada.  The mine is a combination of open pit and underground construction; current estimates put construction costs at $61 million USD and mine reserves are 19 million tonnes of ore, with an ore grade of 0.9 carat per tonne.

Supporting paragraphs: Victor Diamond Mine De Beers
Answer: 28