Canada Gold Sovereign – The Ottawa mint, Canada was set up to coin the gold, which had only recently been discovered in British Columbia and the Yukon, into gold sovereigns.
Canada Gold Mint – Ottawa Mint
The Canadian Mint at Ottawa only struck gold sovereigns for ten years between 1908 and 1919.
All of these are scarce, some rare, and two of the dates are extremely rare.
The Ottawa mint, Canada was set up to coin the gold, which had only recently been discovered in British Columbia and the Yukon, into gold sovereigns. It opened on January 2nd 1908, and this was the first date of British gold sovereign to be minted in Canada, although it is one of the two extremely rare dates.
Naturally the mint produced other coins in silver and base metal, the first coin struck at the Canadian Mint was a fifty cent piece. The mint still operates today, and is known as The Royal Canadian Mint. It was made a Crown Corporation on April 1st 1969
Canada Gold Sovereign Mintage Details
The rarity of each date is not quite in proportion to the mintage figures. Many are thought to have been melted down, some dates being affected more than others.
It is possible that only a handful of the 1908 mintage survive, making this an extremely rare coin. Similarly the 1916 is much rarer than its mintage figure would indicate, making it also a very rare date of sovereign.
More information here