Dermot Desmond’s dream of a Canadian diamond mine started in the mid-1990s. His first investment was in a company called Glenmore Highlands, which in 2000 merged into Mountain Province. Desmond kept the faith. He continued to back Mountain Province, investing tens of millions in further fundraisings through the years. Today, he owns close to 30 per cent of the company and is owed CAD$60 million by it.  Desmond’s dream was a giant diamond mine near the Arctic circle in Canada. One of the world’s biggest.  Diamonds are created deep inside the Earth, and carried to the surface by volcanoes. After…