Hacienda Santa Rosa/El Muerto was one of the coffee estates that at one time formed part of Hacienda Castañer.  José Ramis de Ayreflor (1892-1982) was a Spanish immigrant from Palma de Mallorca who arrived in Puerto Rico in 1911 and in 1917 was employed as a sales clerk at the store of Hacienda Castañer.  During the 1920s, he was administrator (Mayordomo) at Hacienda Castañer and Hacienda La Balear.

The 1920 census record show José Ramis as "mayordomo finca café" at Barrio Guayabo Dulce of Adjuntas.  In December 1935, the Puerto Rico Reconstruction Administration (PRRA) made an agricultural census in Puerto Rico.  This census shows José Ramis with address at Barrio Guayabo Dulce of Adjuntas as the salaried administrator of a one thousand thirty eight cuerdas coffee farm owned since 1912 by Sucrs. de Castañer Hnos.  It is reasonable to believe that Hacienda Santa Rosa/El Muerto was bought by Ramis from the Castañer brothers at a time when they needed the cash or ca. 1938 when Scres. de Castañer Hnos. S en C was in the process of dissolution.  By 1940 Ramis was already the owner of the hacienda as the 1940 census show coffee farmer José Ramis de Ayreflor and his wife Margot Oliver residing at "camino finca - Santa Rosa - Vaquiñas” in Barrio Limani of Adjuntas.  

As of 1977 Hacienda Santa Rosa/El Muerto was still operating using water power from the Yahuecas River.  Water was channeled to its 1870 Hydraulic Turbine which produced enough torque to move all the production machinery.  Its three story main building combined storage, machinery and employee quarters.  Hacienda Santa Rosa also produced slaked lime chunks and bread, remains of the lime kiln and bread oven were already in ruins in 1977.

Its last known owner was José Ramis. It is located off of PR-525 Ramal, 4 km from PR-135.  These pictures are from a 1987 study by Archeologist Dr. Luis Pumarada O'Neill, source: Puerto Rico State Historic Preservation Office.