Between 1862 and 1959 a total of 441,696 ounces of gold was reported out of Elmore County Idaho. Most from districts in the northeastern part of the county. You can find both placer and lode veins in this county. The two main areas are along the Boise River (the Middle Fork and the South fork) and at Twin Springs.
The Atlanta district, which includes Hardscrabble Mine, Middle Boise Mine and Yuba Mine, produced around 385,000 ounces of gold. The area creeks all contain placer. There are numerous old mines that produced lode gold. The Atlanta Hill Mine was the major producer in this district.
All streams and benches along the South Fork of the Boise River contain placer gold. Over 32,000 ounces of gold came from this area.
Northwest of Mayfield, near the Arrowrock Dam, about 15 miles southeast of Boise in Ada County, in Township 2 and 3 North and Range 5 East, is the Neal district. This district produced around $2,000,000 prior to 1911. There are many area placer worked on small regional creeks. Also there are many old lode mines.
Rocky Bar District
In the Rocky Bar District along Bear Creek and its tributaries are very rich in placer gold. Many old lode mines in this area.