Jericho: Plume Agate Rockhounding in Juab County, Utah

Quick details

Access

Permission required

County

Juab County

State

Utah

Coordinates

39.75395, -112.21223

Geology at Jericho

This spot sits on ground mapped as Alluvium that formed within roughly the last 12,000 years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.

Mapped unit

Alluvium

Age

< 1 Ma (Holocene)

Elevation

5,260 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 Jericho

Best months: March to June. Typical highs run 93°F in midsummer and 38°F in midwinter, with winter lows near 16°F.

Climate normals: NOAA 1991-2020 monthlies, LITTLE SAHARA REC AREA station (5 mi away).

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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 Utah — Rockhounding overview
• Utah Geological Survey — collecting guidelines
• SITLA — surface use rules
• Community submissions reviewed against published agency rules

Found at Jericho

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

• Plume AgateEncyclopedia →