RockWoofSketch map
Woof’s favorite find
Mayesville District
We picked it because its USGS record mentions 4 gem or collectible minerals (Beryl, Quartz, Gold, Silver) and 9 of our card minerals overall. No other named site here scores as high on both counts. USGS lists it as past producer for Uranium. Minerals mentioned: Beryl, Quartz, Gold, Mica, Feldspar, Pyrite, Galena, Copper, Silver. Approx. location 40.694, -105.630. 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?
The mineral was noted here, without development.
Produced ore or material at some point in the past.
Was producing when the record was made.
A processing plant site.
Status not recorded.
Explored or test-dug, with no recorded production.
Status terms come from USGS MRDS records.
Mineral cards
Beryl
Mohs 7.5–8. Six-sided crystals; aquamarine and emerald are beryl. Mindat
54 sites
Mica
Mohs 2–3. Peels into thin, flexible, shiny sheets. Mindat
43 sites
Gold
Mohs 2.5–3. Soft, heavy and bright yellow; it doesn’t tarnish. Mindat
41 sites
Silver
Mohs 2.5–3. Native silver tarnishes black. Mindat
35 sites
Pyrite
Mohs 6–6.5. Brassy “fool’s gold,” often cubic. Mindat
24 sites
Feldspar
Mohs 6–6.5. Blocky crystals with flat cleavage faces. Mindat
23 sites
Copper
Mohs 2.5–3. Native copper is soft and turns green as it weathers. Mindat
23 sites
Tourmaline
Mohs 7–7.5. Long striated crystals, often black (schorl) or green and pink (elbaite). Mindat
14 sites
Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.
Minerals recorded here
Beryl 52Muscovite 23Pyrite 19Chalcopyrite 15Scheelite 11Galena 9Pitchblende 7Sphalerite 7Microcline 5Uranophane 5Powellite 5Tantalite 3Commodities
Beryllium 103Gold 36Mica 32Silver 29Uranium 24Tungsten 17Copper 16Feldspar 11Zinc 9Tantalum 8Sites (first 40)
| Site | Commodity | Minerals recorded | Status | Approx. location |
|---|---|---|---|---|
| Crystal Snow Mine | Beryllium, REE | Allanite, Beryl | Occurrence | 40.527, -105.403 |
| Cojade Mine | Beryllium | Amblygonite, Beryl | Producer | 40.355, -105.293 |
| Rattlesnake Park Mine | Lithium, Beryllium | Amblygonite, Beryl | Producer | 40.356, -105.298 |
| Debbie Doll | Beryllium | Beryl | Occurrence | 40.561, -105.338 |
| Wisdom Ranch | Beryllium | Beryl | Producer | 40.604, -105.376 |
| Abandon Mine | Beryllium | Beryl | Occurrence | 40.604, -105.394 |
| Corral Pole | Beryllium | Beryl | Producer | 40.561, -105.412 |
| H E & M #9 | Beryllium | Beryl | Occurrence | 40.633, -105.357 |
| Chaney-Suns Prospects | Beryllium | Beryl | Occurrence | 40.691, -105.658 |
| Rita Beryl Mine | Beryllium | Beryl | Past Producer | 40.543, -105.451 |
| Mt Ethel Mine | Beryllium | Beryl | Past Producer | 40.632, -105.353 |
| Hide Above Lode | Beryllium, Lithium | Beryl | Past Producer | 40.469, -105.384 |
| Calypso Beryl Mine | Beryllium | Beryl | Occurrence | 40.536, -105.449 |
| Storm Mtn. Lode | Beryllium | Beryl | Producer | 40.489, -105.394 |
| Hanks Hole Mine | Beryllium | Beryl | Occurrence | 40.632, -105.353 |
| Beryl Dike Mine | Beryllium | Beryl | Occurrence | 40.646, -105.353 |
| Hilltop No. 23 Mine | Beryllium | Beryl | Past Producer | 40.506, -105.344 |
| Jay Dee Dee Claims | Beryllium | Beryl | Past Producer | 40.532, -105.426 |
| Huckleberry Mine | Beryllium | Beryl | Occurrence | 40.551, -105.488 |
| Kings Canyon Mine | Beryllium | Beryl | Occurrence | 40.556, -105.462 |
| Mt. Olympus Mine | Beryllium, Mica | Beryl | Past Producer | 40.691, -105.257 |
| Crystal Silica Prospect | Niobium (Columbium), Tantalum, Beryllium | Beryl | Occurrence | 40.533, -105.401 |
| Alice M. and Helen M. Beryl | Beryllium | Beryl | Occurrence | 40.650, -105.351 |
| Debbie Doll Mine | Beryllium, Lithium | Beryl | Occurrence | 40.558, -105.334 |
| Green Crystal Mine | Beryllium | Beryl | Past Producer | 40.639, -105.334 |
| Mayesville District | Uranium | Beryl, Chalcopyrite, Galena, Gold, Muscovite, Pyrite, Uranophane | Past Producer | 40.694, -105.630 |
| Wisdom Ranch Prospect | Beryllium | Beryl, Chrysoberyl | Past Producer | 40.598, -105.365 |
| Crystal Mountain Pegmatite District | Mica, Beryllium, Uranium, Feldspar | Beryl, Chrysoberyl, Microcline, Muscovite, Tourmaline, Uraninite | Producer | 40.539, -105.433 |
| Double Opening Prospect | Feldspar | Beryl, Microcline | Past Producer | 40.535, -105.384 |
| Beryl No. 3 Claim | Beryllium, Mica | Beryl, Microcline | Past Producer | 40.642, -105.348 |
| Big Boulder Prospect | Mica | Beryl, Microcline, Muscovite | Past Producer | 40.521, -105.408 |
| Corral Pole Mine | Mica, Beryllium, Feldspar | Beryl, Microcline, Muscovite, Tourmaline, Uraninite | Past Producer | 40.552, -105.417 |
| Red Head Claim | Thorium, Beryllium, Uranium | Beryl, Monazite, Columbite, Tantalite | Occurrence | 40.883, -105.467 |
| Crystal Silica Mine | Mica | Beryl, Muscovite | Past Producer | 40.535, -105.436 |
| Primorose Beryl Lode | Beryllium, Mica, Manganese | Beryl, Muscovite | Past Producer | 40.558, -105.451 |
| Mica-Beryl Prospect | Mica, Beryllium | Beryl, Muscovite | Occurrence | 40.534, -105.400 |
| Humphrey Beryl Prospect | Mica, Beryllium | Beryl, Muscovite | Occurrence | 40.539, -105.411 |
| Hyatt Ranch Mine | Feldspar, Beryllium, Mica | Beryl, Muscovite | Producer | 40.460, -105.353 |
| Lodge Pole Mine | Mica, Beryllium | Beryl, Muscovite | Past Producer | 40.547, -105.406 |
| Pan Claims | Beryllium | Beryl, Muscovite | Past Producer | 40.572, -105.430 |
Fossil collections
The Paleobiology Database lists 40 fossil collection records in Larimer County. These are research records, not public dig sites.
Nearby counties
Boulder County · Weld County · Grand County · Gilpin County · Clear Creek 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