The by products are usefully on their own but the o2 and h2 being created would be of great benefit. Hydrogen can not only be burned but can go thru another prosses to be used even as fertilizer not to mention the benefit of thickening the ozone surrounding the region. As well as the highly oxygenated chamber inside similar to a hyperbolic chamber used in modern medicine. Keeping in mind granite expels a certain com radiation which is also used in medicine. Granite conducts electricity the gold cap atop if indeed was the could and would have acted like a lightning rod . and it could have been part of the function as well