Rope Mine: Gold Prospecting in Marquette County, Michigan

Plan your visit

Generally open to casual rockhounding

County

Marquette County

State

Michigan

Nearest road

County Road GN

Coordinates

46.52972, -87.71583

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.

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 Rope Mine

Comfortable months (45 to 90°F highs)

Best months: April to October. Typical highs run 77°F in midsummer and 22°F in midwinter, with winter lows near 6°F.

Climate normals: NOAA 1991-2020 monthlies, ISHPEMING WWTP station (3 mi away).

Geology at Rope Mine

This spot sits on Metabasalt, mapped as metabasalt and schist that formed roughly 2800 to 2500 million years ago. Gold in volcanic terrain like this is usually tied to old vein systems and the gravels that drain them, so nearby washes tend to carry the color.

Mapped unit

Metabasalt

Age

2800–2500 Ma (Neoarchean)

Rock types

metabasalt and schist

Elevation

1,460 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

• Michigan DNR, Rockhounding rules
• Michigan Geological Survey
• Isle Royale National Park, Rules
• Community submissions reviewed against published agency rules