Sugarloaf & Ruby Mountains: Rhyolite & Perlite Rockhounding in Chaffee County, Colorado

Updated June 2026

Sugarloaf & Ruby Mountains is a mapped rockhounding spot in Chaffee County, Colorado. Reported finds include rhyolite, perlite, apache tears, spessartine, topaz. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Chaffee County
State: Colorado
Nearest road: CR 300
Coordinates: 38.76015, -106.07219

Geology at Sugarloaf & Ruby Mountains

This spot sits on ground mapped as Topaz rhyolite flow of Nathrop Volcanics, including basal vitrophyre that formed roughly 34 to 28 million years ago. Volcanic ground like this weathers into rocky slopes and float, and fresh exposures in cuts and drainages are usually the most productive places to look.

Mapped unit: Topaz rhyolite flow of Nathrop Volcanics, including basal vitrophyre
Age: 34–28 Ma (Early Oligocene)
Elevation: 8,310 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Sugarloaf & Ruby Mountains

Best months: March to November. Typical highs run 82°F in midsummer and 39°F in midwinter, with winter lows near 10°F. At about 8,310 ft, snow can block access from late fall well into spring, so check conditions outside of summer.

Climate normals: NOAA 1991-2020 monthlies, BUENA VISTA 2S station (5 mi away), adjusted for elevation.

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Sugarloaf & Ruby Mountains

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Sugarloaf & Ruby Mountains.

Sugarloaf & Ruby Mountains FAQ

Where is Sugarloaf & Ruby Mountains?+

Sugarloaf & Ruby Mountains is in Chaffee County, Colorado, at 38.76015, -106.07219. Nearest road: CR 300.

What rocks and minerals can you find at Sugarloaf & Ruby Mountains?+

Sugarloaf & Ruby Mountains is reported to produce Rhyolite, Perlite, Apache Tears, Spessartine, Topaz.

Is collecting allowed at Sugarloaf & Ruby Mountains?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Sugarloaf & Ruby Mountains?+

A rock hammer, a pry bar, gloves, and safety glasses suit pegmatite ground. Work weathered zones and check dump piles; coarse crystals often sit in decomposed rock.

When is the best time to visit Sugarloaf & Ruby Mountains?+

The most comfortable months at Sugarloaf & Ruby Mountains are March to November. At about 8,310 ft, snow can block access from late fall well into spring, so check conditions outside of summer.

How do I get to Sugarloaf & Ruby Mountains?+

Open the directions link to navigate to 38.76015, -106.07219 in Google Maps. The nearest road is CR 300.

More rockhounding in Colorado

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Open Sugarloaf & Ruby Mountains on the map

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