The federal record (USGS MRDS) lists 544 gold occurrences in Boulder County — 349 of them past or active producers. Below is that record, readable: the documented sites, and the live map that puts claims, creeks, roads and geology under every one of them.
Open the Boulder County gold map → Membership — first week free
Producers first, then prospects and occurrences — each links into the live map of that exact ground:
| Site | Status | Type |
|---|---|---|
| Afterthought | Past producer | — |
| Alahambra | Past producer | — |
| Alamakee | Past producer | — |
| Alaska Tunnel | Past producer | — |
| Alcyone | Past producer | — |
| Allied Gold Mining Company | Past producer | — |
| Alpine Horn | Past producer | — |
| Alton Tunnel | Past producer | — |
| Alturas | Past producer | — |
| Amalban Thief | Past producer | — |
| American | Past producer | — |
| Amy Paul | Past producer | — |
| Anchor | Past producer | — |
| Archer | Past producer | — |
| Arrowhead | Past producer | — |
| Atchison and Eldorado | Past producer | — |
| Atlanta | Past producer | — |
| Atlantic | Past producer | — |
| Audophone | Past producer | — |
| Barron | Past producer | — |
| Beaver | Past producer | — |
| Beggar | Past producer | — |
| Bell | Past producer | — |
| Belle | Past producer | — |
| Belle of Memphis | Past producer | — |
| Bellvue | Past producer | — |
| Belmont | Past producer | — |
| Ben C. Lowell | Past producer | — |
| Big 5 | Producer | — |
| Big Horn | Past producer | — |
Showing the top 30 of 544 recorded gold occurrences — every one is on the live map.
The free map shows every dot above. Membership opens the layers that turn dots into a plan — favorability at working zoom, active claims, land ownership, geology and the creeks that drain the known sources. The first 7 days are free.