In this structure, the most mature rums are found in the lowest solera level, and it’s from these casks that the rum is extracted for bottling. These are then replenished from the row of casks above them, and these in turn by the row above. A blend of five year old Caribbean rums from Guyana and Barbados is used to fill the top row.
The solera casks on the bottom row are never fully emptied. Remarkably, this means that every single bottle of Dos Maderas contains a small amount of rum from the very first batch.