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Historical map overlays

USGS scanned historical topographic maps. Enable an overlay and adjust its opacity. Works in 2D and 3D.

Sun azimuth: 315°   Sun altitude: 45°   Z factor: 1   Lidar opacity: 1
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Boise — Ada County, Idaho County

Gold Mining Site ID • Ada County, Idaho County County
Description
East of Boise 10 miles, near the Elmore County line, is the Black Hornet district. It had a total production of around 22,000 ounces of gold from area lode mines.
Historical Notes
Source: Tom Ashworth's Prospectors Cache (tomashworth.com / Tom Ashworth). Author: Tom Ashworth. Original page: ada_id.shtml. Area: Boise. Map coordinates refined from text (area: "Boise, Ada County, Idaho County, Idaho, USA"). Still approximate — verify on the ground. East of Boise 10 miles, near the Elmore County line, is the Black Hornet district. It had a total production of around 22,000 ounces of gold from area lode mines.
Status / Verification historical_site — Legendary or approximate

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