Two years ago I was offered a rare trip to Guyana, South America to visit the home of El Dorado Rum, Demerara Distillers Limited (DDL). The trip was part of a media tour designed to bring more awareness to the El Dorado brand and the wonderful rum which the Diamond Distillery produces (see my write-up of the distillery tour here). One of the more interesting finds I came across when I was in Guyana was a bottle of whisky produced by Demerara Distillers called Diamond Club Black Label Whisky. I happened to see it during a media tour of Georgetown (the largest and the Capital city of Guyana) in a local liquor store, and the whisky was selling for less than 3 bucks Canadian per bottle.
I had no idea that the folks who made El Dorado Rum, also produced a Black Label Malt Whisky, and I was of course very curious about the spirit. When I quizzed the folks at the Diamond Distillery, I was told that the base malt for this whisky is produced by Inver House (who own Balblair, anCnoc and Old Pulteney), and that they will occasionally ship bulk malt whisky to Guyana where it is blended (or stretched) with locally produced cane spirit, and sold as their Blended Malt Whisky.
You may read the full review by clicking on the following excerpt link:
Review: Diamond Club Black Label Malt Whisky
Enjoy my review which includes a nice cocktail suggestion, the Georgetown Sour.
According to the 
The result is a fully aged, double-filtered, 6 Year Old White Rum. This rum is meant not just to compete with the new strain of super premium white rums that have entered the market recently, it is meant to compete head to head with the super premium luxury vodkas which have garnered a good chunk of the market share in the distilled spirits category.
The Rum Howler Blog 