Maple Grove Quarry: Calcite & Celestite Rockhounding in Seneca County, Ohio

Updated June 2026

Maple Grove Quarry is a mapped rockhounding spot in Seneca County, Ohio. Reported finds include calcite, celestite, dolomite, fluorite, marcasite, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Seneca County
State: Ohio
Nearest road: Cr42
Postcode: 44815
Coordinates: 41.22557, -83.21373

Geology at Maple Grove Quarry

This spot sits on Tymochtee and Greenfield Formations, Undivided, mapped as dolostone that formed roughly 445 to 425 million years ago. Carbonate rock like this is the classic host for lead, zinc, and fluorite mineralization, which typically follows old cavities and replacement zones.

Mapped unit: Tymochtee and Greenfield Formations, Undivided
Age: 445–425 Ma (Llandovery to Wenlock)
Rock types: dolostone
Elevation: 660 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 Maple Grove Quarry

Best months: March to November. Typical highs run 84°F in midsummer and 33°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, FREMONT AG STN station (6 mi away).

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.

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 Maple Grove Quarry

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 Maple Grove Quarry.

Across the state line from Maple Grove Quarry

Maple Grove Quarry is close enough to the Ohio border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

William C. Sterling State ParkMonroe County, Michigan · 49 mi away

Maple Grove Quarry FAQ

Where is Maple Grove Quarry?+

Maple Grove Quarry is in Seneca County, Ohio, at 41.22557, -83.21373. Nearest road: Cr42.

What rocks and minerals can you find at Maple Grove Quarry?+

Maple Grove Quarry is reported to produce Calcite, Celestite, Dolomite, Fluorite, Marcasite, Pyrite, Fossils.

Is collecting allowed at Maple Grove Quarry?+

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. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Maple Grove Quarry?+

A rock hammer, gloves, and safety glasses cover old mining-district ground. Stay out of shafts and adits; the best specimens typically come from dump piles.

When is the best time to visit Maple Grove Quarry?+

The most comfortable months at Maple Grove Quarry are March to November.

How do I get to Maple Grove Quarry?+

Open the directions link to navigate to 41.22557, -83.21373 in Google Maps. The nearest road is Cr42.

More rockhounding in Ohio

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Open Maple Grove Quarry on the map

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