Portal Ridge Area: Rhodonite Rockhounding in Los Angeles County, California

Updated June 2026

Portal Ridge Area is a mapped rockhounding spot in Los Angeles County, California. Reported finds include rhodonite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Los Angeles County
State: California
Nearest road: Pine Canyon Road
Coordinates: 34.70542, -118.52003

Geology at Portal Ridge Area

This spot sits on granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges), mapped as granodiorite that formed roughly 260 to 3 million years ago. Plutonic rock like this weathers slowly into grus and boulders, and the most productive collecting is typically in weathered zones and drainages.

Mapped unit: granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges)
Age: 260–3 Ma (Lopingian to Tertiary)
Rock types: granodiorite
Elevation: 4,480 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 Portal Ridge Area

Conditions here are workable year-round, with typical highs from 51°F in winter to 87°F in summer.

Climate normals: NOAA 1991-2020 monthlies, FAIRMONT 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.

State guidance last verified: April 1, 2026

BLM California — Recreational mineral collecting
California Geological Survey
CDFW — Suction Dredge Mining Permit Program
Community submissions reviewed against published agency rules

Found at Portal Ridge Area

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

Rhodonite Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Portal Ridge Area.

Portal Ridge Area FAQ

Where is Portal Ridge Area?+

Portal Ridge Area is in Los Angeles County, California, at 34.70542, -118.52003. Nearest road: Pine Canyon Road.

What rocks and minerals can you find at Portal Ridge Area?+

Portal Ridge Area is reported to produce Rhodonite.

Is collecting allowed at Portal Ridge Area?+

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 Portal Ridge Area?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Portal Ridge Area?+

Portal Ridge Area is workable year-round.

How do I get to Portal Ridge Area?+

Open the directions link to navigate to 34.70542, -118.52003 in Google Maps. The nearest road is Pine Canyon Road.

More rockhounding in California

See all 97 California spots →

Open Portal Ridge Area on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.