Dig for Gems: Rockhounding in San Diego County, California

Quick details

Access

Paid / fee dig

County

San Diego County

State

California

Nearest road

Magee Road

Postcode

92059

Coordinates

33.38976, -117.04965

Geology at Dig for Gems

This spot sits on ground mapped as Gabbro, undivided that formed roughly 145 to 66 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

Gabbro, undivided

Age

145–66 Ma (Cretaceous)

Elevation

1,370 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 Dig for Gems

Conditions here are workable year-round, with typical highs from 67°F in winter to 86°F in summer.

Climate normals: NOAA 1991-2020 monthlies, FALLBROOK 5 NE station (9 mi away), adjusted for elevation.

Land & collecting status

Pay-to-dig site

This is a fee-dig location. Hours, prices, and what you can keep vary by operator. Call ahead before driving out.

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