I hope that this helps for the estimated annual gold and silver production:
Scotgold predict that the mine will produce 567kg (?20,673,387) of gold and 2,268kg (?1,841,616) of silver annually.
Sources:
http://www.bbc.co.uk/news/uk-scotland-scotland-business-14213618
http://goldprice.org/gold-price-per-kilo.html
http://silverprice.org/silver-price-per-kilo.html