All I can find out about the Ada H. Mine is that it was part of the vast Spruce Mountain complex. When the mine first opened is unknown, but in 1916, the Keystone, Ada H., and Black Forest Mines were active but only produced $13,000. In March of 1920, a new company, the Ada H. Mining Company, formed with Samuel Neff, president, and Herman Badt, vice-president. Bart Woodward, still mining around Spruce Mountain, was named manager. The ownership was basically the same as the Spruce Mountain Monarch Mining Company but was separated off for business purposes. During 1924, the Ada H. Mine was purchased by the Paramount Consolidated Mining Company.
To learn more about the Spruce Mountain Mining District and the Ada H. Mine, click on this link Spruce Mountain. This article from Shawn Hall's web site is the most extensive and best that I have read about this area.
Click on the links below to view photos of other Mines/Townsites that I have visited in the Sprucemont Mining District:
Badger Lead Mine
Black Forest Mine
Latham (Kille) Mine