.Fort Drum Crystal Mines corporate and administrative office is located in historic downtown Lake Wales, Florida. It was Lake Wales where Emil Jahna Sr. brought his family in 1925 from Sarasota, Florida to open Ridge Stone and Tile. The manufacturing of concrete roof tile requires the use of sand, and it was in the Ridge Stone and Tile days that mining sand became part of the Jahna family. From the humble beginnings in a three room house remodeled into an office in 1961, the company eventually grew into a larger office which they built in 1980 beside the original corporate location on Tillman Avenue. It was there the company operated for 20 years. In 1999, Jahna purchased and renovated the Caldwell – Temple building on Stuart Avenue in downtown Lake Wales as the new corporate office. The building was vacant at the time and it took over a year to renovate and build out the office space as it is today. Originally built in the early 1920’s, the building had been a furniture store, casket manufacturer, and Masonic Lodge, among other uses. After the renovation and with the help of the Lake Wales as the new corporate office. The building was vacant at the time and it took over a year to renovate and build out the office space as it is today. Originally built in the early 1920’s, the building had been a furniture store, casket manufacturer, and Masonic Lodge, among other uses. After the renovation and with the help of the Lake Wales Historical Society.