Am not sure about the Silver Slipper Saloon being the correct one, unless the Booneville's Hotel Saloon was named the Silver Slipper. For your reference, the following:
1887 July 2 - [The Idaho Avalanche newspaper, Silver City,Owyhee County, Idaho Territory, p. 3, c. 3]:
Advertisement: "Boonville Hotel and Saloon. Notice is hereby given that the undersigned have leased the Boonville Hotel and Saloon and are now prepared to furnish Board and Lodging to the traveling public. The best of Liquors & Cigars constantly kept on hand. Call and see us. A. F. Brunzell & Bro. (June 30, 1887.)"
Should you have a question, please feel free to contact me.