Great Sand Bay beach

ROCKHOUNDING OPEN / LEGAL DOCUMENTED

Where: Michigan · North America · approx. 47.44, -88.23 (vicinity only)

Why this spot: Keweenaw bay between Eagle River and Eagle Harbor cut into copper-country basalt

What turns up: agate, datolite pebbles, epidote, prehnite

Access: Open / legal.

Public roadside beach with casual picking accepted.

Satellite view, historic-map overlays, tide/flow context and field notes are in the app. Exact research detail is part of Pro.

Pins are approximate by design. This page is historical research, not permission to dig. Check ownership and local law first.