RockWoofSketch map
Woof’s favorite find
Jamestown District
We picked it because its USGS record mentions 4 gem or collectible minerals (Quartz, Gold, Fluorite, Silver) and 7 of our card minerals overall. That ties with 1 other site(s), so we broke the tie by mine status (past producers first), then USGS record quality, then name. USGS lists it as past producer for Fluorine-Fluorite, Gold. Minerals mentioned: Quartz, Gold, Pyrite, Galena, Fluorite, Copper, Silver. Approx. location 40.127, -105.388. USGS record.
Ask first: a USGS record doesn’t mean you can visit. Find out who owns the land and get permission before collecting.
Field cards: what kind of sites?
Produced ore or material at some point in the past.
The mineral was noted here, without development.
Was producing when the record was made.
Status not recorded.
Explored or test-dug, with no recorded production.
A processing plant site.
Status terms come from USGS MRDS records.
Mineral cards
Gold
Mohs 2.5–3. Soft, heavy and bright yellow; it doesn’t tarnish. Mindat
621 sites
Silver
Mohs 2.5–3. Native silver tarnishes black. Mindat
407 sites
Fluorite
Mohs 4. Cubes in purple, green or yellow; many glow under UV. Mindat
65 sites
Copper
Mohs 2.5–3. Native copper is soft and turns green as it weathers. Mindat
61 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
46 sites
Quartz
Mohs 7. Six-sided points; smoky quartz is NH’s state gem. Mindat
35 sites
Galena
Mohs 2.5–2.75. Heavy, silvery lead ore that breaks into cubes. Mindat
31 sites
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
16 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
Minerals recorded here
Gold 210Silver 51Ferberite 44Telluride 24Galena 24Pyrite 22Chalcopyrite 18Sphalerite 16Beryl 9Pitchblende 9Sylvanite 8Molybdenite 7Commodities
Gold 586Tungsten 210Silver 95Fluorine-Fluorite 59Uranium 55Lead 34Copper 30Flagstone 25Beryllium 14Zinc 12Sites (first 40)
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Caribou Mine | Gold, Lead, Silver | Acanthite, Cerargyrite, Chalcopyrite, Galena, Pyrargyrite, Silver, Sphalerite, Pitchblende | Past Producer | 39.981, -105.583 |
| Grand Island-Caribou District | Gold, Lead, Silver | Argentite, Chalcopyrite, Galena, Pyrargyrite, Silver, Sphalerite, Titaniferous Magnetitite, Pitchblende, Cerargyrite | Past Producer | 39.981, -105.579 |
| Mogul Tunnel | Molybdenum | Barite, Ilsemannite, Molybdenite | Occurrence | 39.948, -105.569 |
| Beryl No 1 Prospect | Niobium (Columbium), Tantalum, Beryllium | Beryl | Occurrence | 40.080, -105.375 |
| New Girl Prospect | Niobium (Columbium), Tantalum, Beryllium | Beryl | Producer | 40.121, -105.322 |
| Columbine | Feldspar, Mica, Beryllium, Niobium (Columbium), Copper | Beryl, Columbite, Feldspar, Malachite, Mica | Producer | 40.118, -105.326 |
| New Girl Prospect | Beryllium, Niobium (Columbium), Tantalum | Beryl, Columbite, Tantalite | Occurrence | 40.121, -105.322 |
| Mona No 9 Claim | Beryllium, Mica, Tantalum | Beryl, Columbite, Tantalite | Producer | 40.167, -105.434 |
| Little Bennie | Beryllium, Feldspar, Mica | Beryl, Feldspar, Mica | Producer | 40.093, -105.342 |
| Beryl #2 | Niobium (Columbium), Feldspar, Beryllium, Mica | Beryl, Feldspar, Mica | Producer | 40.073, -105.379 |
| Beryl Lode | Beryllium, Feldspar, Mica | Beryl, Feldspar, Mica, Quartz | Producer | 40.109, -105.337 |
| Beryl #1 | Niobium (Columbium), Tantalum, Beryllium | Beryl, Tantalite | Occurrence | 40.080, -105.375 |
| Mountain Goat | Uranium | Chalcopyrite, Molybdenite | Past Producer | 39.995, -105.634 |
| Sunday Vein | Molybdenum | Chalcopyrite, Molybdenite, Scheelite | Occurrence | 39.943, -105.496 |
| Copper King Nickel Mine | Cobalt, Nickel | Chalcopyrite, Niccolite, Pentlandite, Pyrrhotite | Past Producer | 40.055, -105.420 |
| Dolly Varden | Gold | Chalcopyrite, Pyrite | Past Producer | 40.030, -105.480 |
| Copper Glance | Gold, Copper | Copper, Gold | Producer | 40.037, -105.478 |
| Rusty Gold, Copper Blush | Gold, Copper | Copper, Gold | Occurrence | 40.139, -105.368 |
| Alice Mine | Lead, Silver, Gold, Copper, Fluorine-Fluorite | Copper, Gold, Lead, Silver | Producer | 40.122, -105.399 |
| Longfellow | Gold, Silver, Copper | Copper, Gold, Silver | Producer | 40.133, -105.364 |
| Elkhorn Or Tin Horn | Feldspar | Feldspar | Occurrence | 40.131, -105.337 |
| Highland | Feldspar | Feldspar | Occurrence | 40.131, -105.337 |
| Puzzle | Feldspar | Feldspar | Producer | 40.124, -105.310 |
| Anna C. Mine | Tungsten | Ferberite | Past Producer | 39.973, -105.530 |
| Big Six Mine | Tungsten | Ferberite | Past Producer | 39.968, -105.515 |
| Range View Mine | Tungsten | Ferberite | Past Producer | 40.006, -105.447 |
| Monday Lode | Tungsten | Ferberite | Producer | 40.014, -105.393 |
| Vasco No. 2 & 5 | Tungsten | Ferberite | Producer | 39.971, -105.480 |
| World Mine | Tungsten | Ferberite | Producer | 39.983, -105.478 |
| Hoosier Mine | Tungsten | Ferberite | Past Producer | 39.975, -105.499 |
| Clyde Mine | Tungsten | Ferberite | Past Producer | 39.979, -105.498 |
| Illinois | Tungsten | Ferberite | Past Producer | 39.970, -105.526 |
| Conger Mine | Tungsten | Ferberite | Past Producer | 39.973, -105.522 |
| Fraction Lode | Tungsten | Ferberite | Past Producer | 40.004, -105.430 |
| Pennsylvania Lode | Tungsten | Ferberite | Past Producer | 40.009, -105.389 |
| Good Friday Mine | Tungsten | Ferberite | Past Producer | 40.004, -105.402 |
| Poop-Out Claims | Tungsten | Ferberite | Occurrence | 40.006, -105.432 |
| Tungsten (Chance) Mine | Tungsten | Ferberite | Past Producer | 39.941, -105.497 |
| Dorothy and Katie Mines | Tungsten | Ferberite | Past Producer | 40.012, -105.372 |
| Pueblo Belle | Tungsten | Ferberite | Past Producer | 40.004, -105.385 |
Fossil collections
The Paleobiology Database lists 17 fossil collection records in Boulder County. These are research records, not public dig sites.
Nearby counties
Gilpin County · Clear Creek County · Jefferson County · Grand County · Denver County
Colorado mineral guides
- Beryl in Colorado
- Tourmaline in Colorado
- Quartz in Colorado
- Garnet in Colorado
- Gold in Colorado
- Mica in Colorado
Back to all Colorado counties.
How we built this page: we counted named sites in the USGS Mineral Resources Data System (MRDS) for this area, left out sand, gravel, crushed stone, clay pits and unnamed sites, grouped them by Census county, and linked every site to its USGS record. We did not visit these sites, and MRDS does not tell you who owns the land or whether collecting is allowed.
Source: USGS Mineral Resources Data System (MRDS). USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date. Each site links to its USGS record.
Updated