Oelrichs: Agate Rockhounding in Oglala Lakota County, South Dakota
Updated July 2026
Oelrichs is a mapped rockhounding spot in Oglala Lakota County, South Dakota. Reported finds include agate. Below: coordinates, access notes, nearby spots, and trip-planning links.
Map showing Oelrichs in Oglala Lakota County, South Dakota
Quick details
- Access
- Permission required
- County
- Oglala Lakota County
- State
- South Dakota
- Nearest road
- Blacktail Creek Road
- Coordinates
- 43.20105, -102.88063
Geology at Oelrichs
This spot sits on Eolian Deposits, mapped as silt and sand that formed within roughly the last 3 million years. Gravels like these concentrate whatever survives the river: agate, jasper, and other tough silica typically show up as rounded, waxy stones.
- Mapped unit
- Eolian Deposits
- Age
- 3 Ma to present (Quaternary)
- Rock types
- silt and sand
- Elevation
- 3,060 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 Oelrichs
Best months: March to November. Typical highs run 88°F in midsummer and 37°F in midwinter, with winter lows near 14°F.
Climate normals: NOAA 1991-2020 monthlies, OGLALA 1S station (7 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.
Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.
Found at Oelrichs
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 Oelrichs.
- OglalaOglala Lakota County, South Dakota · 7 mi awayAgate, Chalcedony, Jasper
- OelrichsTop pick in South DakotaFall River County, South Dakota · 15 mi awayFairburn Agate, Jasper, Calcite
- RockyfordOglala Lakota County, South Dakota · 27 mi awayBlue Chalcedony
- Cheyenne RiverTop pick in South DakotaCuster County, South Dakota · 29 mi awayFairburn Agate
- ArdmoreTop pick in South DakotaFall River County, South Dakota · 32 mi awayFairburn Agate, Agatized Wood, Jasper
- Red ShirtOglala Lakota County, South Dakota · 33 mi awayAgate, Chalcedony, Jasper
- FairburnTop pick in South DakotaCuster County, South Dakota · 33 mi awayFairburn Agate, Agatized Wood, Yellow Jasper
- Buffalo GapCuster County, South Dakota · 34 mi awayFairfield Agate
Across the state line from Oelrichs
Oelrichs is close enough to the South Dakota border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.
- Whiteclay (Fairburn area)Sheridan County, Nebraska · 19 mi awayFairburn Agate, Jasper, Chalcedony
- WhiteclaySheridan County, Nebraska · 21 mi awayAgate, Chalcedony, Jasper
- Pine RidgeSheridan County, Nebraska · 21 mi awayQuartz Concretions, Agate, Petrified Wood
- ChadronTop pick in NebraskaDawes County, Nebraska · 24 mi awayChalcedony, Blue Chalcedony
- OrellaTop pick in NebraskaDawes County, Nebraska · 36 mi awayFairburn Agate, Jasper, Carnelian
- Dawes CountyDawes County, Nebraska · 39 mi awayChalcedony, Celestite, Fossils
Oelrichs FAQ
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More rockhounding in South Dakota
See all 43 South Dakota spots →Open Oelrichs on the map
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