Philadelphia: Copper & Chrysocolla Rockhounding in Otero County, New Mexico

Plan your visit

Generally open to casual rockhounding

County

Otero County

State

New Mexico

Nearest road

County Road A003

Postcode

88342

Coordinates

32.41465, -106.11298

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Access note: BLM records active mining claims in this area. Collecting from inside an active claim needs the claim holder's permission.

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.

Best time to visit Philadelphia

Comfortable months (45 to 90°F highs)

Best months: September to May. Typical highs run 95°F in midsummer and 58°F in midwinter, with winter lows near 27°F. Summer heat here is intense, so carry more water than you think you need and work the early morning.

Climate normals: NOAA 1991-2020 monthlies, OROGRANDE station (3 mi away), adjusted for elevation.

Geology at Philadelphia

This spot sits on intrusive rocks of intermediate to silicic composition, mapped as granitic and syenitic that formed roughly 56 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

intrusive rocks of intermediate to silicic composition

Age

56–3 Ma (Eocene to Pliocene)

Rock types

granitic and syenitic

Elevation

4,640 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.

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

• Rockhound State Park, Collection rules
• BLM New Mexico
• New Mexico Bureau of Geology and Mineral Resources
• Community submissions reviewed against published agency rules