Apart from the very obvious Guibal Fanhouse closer investigation of the site reveals some more details.

Running due east from the fanhouse is a culvert with a metal pipe inside, it runs for nearly 200 feet and remains of a building can be seen on the surface where it ends.

 

Further east again in the undergrowth appears to be the base of a chimney (or the base of a privvy depending on your personal interpretation)

Slightly to the north of that a stone engine base can also be found hidden in the undergrowth.