Rockhounding in Ontonagon County, Michigan

2 mapped rockhounding spots in Ontonagon County. Most commonly produces keweenaw agate, chalcedony, jasper, thomsonite.

Ontonagon County rockhounding photos

Representative spot and material photos from this county, shown where verified public image records are available.

1 photo

A banded Lake Superior agate, like those that wash up on the Ontonagon shore — Lake Superior Beach (Ontonagon)Ontonagon County, Michigan

Minerals reported in Ontonagon County

Keweenaw Agate2
Chalcedony1
Jasper1
Thomsonite1

Standout in Ontonagon County

Hand-picked spot in Ontonagon County, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.

Top pick
Lake Superior Beach (Ontonagon)
Public
Ontonagon County
The Lake Superior shoreline around Ontonagon is among the most agate-rich in Michigan, with the stretch toward Copper Harbor noted for unusually heavy agate cover along with quartz, jasper, and occasional copper. Public township and roadside beaches give free access to the wave-sorted gravel where Keweenaw agates and thomsonite turn up. The best searching follows a storm that reworks the gravel.
Keweenaw Agate, Thomsonite, Chalcedony, Jasper

Spots in Ontonagon County

Spot	Minerals	Coordinates	Access
Gull PointM 64	Keweenaw Agate	46.8361, -89.5495	Public
Lake Superior Beach (Ontonagon)Lakeshore Road	Keweenaw Agate Thomsonite Chalcedony Jasper	46.8713, -89.3352	Public

Neighboring counties in Michigan

Adjacent rockhounding counties, ranked by how close their centroids sit to Ontonagon County. A natural extension if Ontonagon County is already on your trip plan.

Across the state line from Ontonagon County

Rockhounding counties in neighboring states within driving range. Geology rarely respects state borders — these are often the closest mapped spots you can reach without going deeper into Michigan.

Ontonagon County FAQ

Where can I rockhound in Ontonagon County, Michigan?+

RockHoundR tracks 2 rockhounding spots in Ontonagon County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Ontonagon County?+

Spots in Ontonagon County most often produce Keweenaw Agate, Chalcedony, Jasper, Thomsonite. Individual spots can vary widely.

Are these Ontonagon County rockhounding spots on public land?+

Most spots in this list are tagged public, but access can change with seasons, claims, and local closures. Always verify before driving out — links in the app open the right BLM, USFS, or county pages.

Plan a Ontonagon County rockhounding trip

Open RockHoundR to see these spots on the map alongside land overlays, weather, geology, and your saved finds.