Juneau gold belt only slightly different would be valueless." In 1895, southeastern Alaska was the first part of the Territory of Alaska to have its mineral resources researched by the U.S. Geological Survey. It surveyed the gold deposit areas of Juneau and Sitka. Systematic surveying began in 1902 which included a topographic map of the gold-bearing area adjacent to Juneau. In the following year, a detailed map of the Juneau region's geology was mapped in detail. A reconnaissance of almost the entire Juneau gold belt was carried out from Port Houghton to the boundary with Canada; in 1904, another reconnaissance, this time of
Juneau gold belt fissure fillings of the area are comparable with the California "mother lode" deposits. Most of the gold mines in the Juneau belt occur in the band of black slate which lies between the schists to the northeast and the greenstones to the southwest. "The complex of veins which follow this black slate is described as the main lode system of the Juneau belt." "Parallelism of vein systems and ore deposits with the outcrops of bed-rock formations...is one of the noteworthy characteristics of the district." This results in a "linear distribution of the mines." Most of the gold deposits are found