RockWoof
Check access before you go. Most sites listed here are old mines, quarries or prospects, and many are on private land or active mining claims. Get the landowner's permission, check the rules of the agency that manages any public land, and never enter mine workings. Locations are approximate.

Sketch map

Sidnaw Slate Quarry (Past Producer)Taylor Mine + 3 more nearby (Past Producer)Unnamed Silver Prospect (Prospect)Silver River Silver Prospect (Prospect)Gomanche Creek Slate Quarry (Past Producer)Detroit Graphite Co. Graphite Quarry + 1 more nearby (Producer)Grummett (Ned Lake) Exploration (Prospect)N.East Branch Slate Quarry (Past Producer)Skanee Area (Occurrence)Huron Bay Slate Co (Past Producer)Titan Mine + 1 more nearby (Past Producer)Hancock Exploration (Prospect)Ohio Mine + 5 more nearby (Past Producer)Webster Mine + 9 more nearby (Past Producer)Unnamed Lead Prospect (Occurrence)Unnamed Silver Prospect (Prospect)Section 23 Silver Prospect (Prospect)Unnamed Vanadium Prospect + 1 more nearby (Occurrence)Unnamed Gold Prospect + 1 more nearby (Prospect)Bughole Exploration (Prospect)
Past ProducerProducerProspectOccurrenceStatus unknown
20 paw pins; nearby sites are grouped into one pin. Hover or tap a pin for the site name. County outline: US Census Bureau cartographic boundary file (2023). Locations approximate.

Woof’s favorite find

Beaufort Mine

We picked it because its USGS record mentions 1 gem or collectible mineral (Garnet) and 3 of our card minerals overall. That ties with 8 other site(s), so we broke the tie by mine status (past producers first), then USGS record quality, then name. USGS lists it as past producer for Iron. Minerals mentioned: Garnet, Mica, Magnetite. Approx. location 46.542, -88.179. USGS record.

Ask first: a USGS record doesn’t mean you can visit. Find out who owns the land and get permission before collecting.

Field cards: what kind of sites?

25
Past Producer

Produced ore or material at some point in the past.

10
Prospect

Explored or test-dug, with no recorded production.

4
Occurrence

The mineral was noted here, without development.

2
Producer

Was producing when the record was made.

Status terms come from USGS MRDS records.

Mineral cards

Counts are sites whose USGS record mentions the mineral or commodity. Hardness from Mindat.

Minerals recorded here

Limonite 9Grunerite 9Hematite 6Gold 3Graphite 2Siderite 1Slate 1Silver 1Vanadiferous Magnetite 1

Commodities

Iron 11Vanadium 5Graphite 5Silver 4Gold 4Lead 3Granite 3Zinc 2Uranium 1Slate 1

Sites (first 40)

SiteCommodityMinerals recordedStatusApprox. location
Hancock ExplorationGoldGoldProspect46.476, -88.192
Marquette ExplorationGoldGoldProspect46.748, -88.046
Grummett (Ned Lake) ExplorationGoldGoldProspect46.454, -88.336
Detroit Graphite Co. Graphite QuarryGraphiteGraphiteProducer46.635, -88.347
Northern Graphite Works QuarryGraphiteGraphiteProducer46.647, -88.446
Portland MineIronHematite, Grunerite, LimonitePast Producer46.535, -88.152
Ohio MineIronHematite, Grunerite, LimonitePast Producer46.537, -88.162
Steward Mine (Orleans)IronHematite, Grunerite, LimonitePast Producer46.536, -88.157
Spurr MineIronHematite, Grunerite, SideritePast Producer46.541, -88.133
Taylor MineIronHematite, LimonitePast Producer46.664, -88.442
Imperial Mine (Wetmore)IronHematite, Limonite, GruneritePast Producer46.531, -88.133
Norwood MineIronLimonite, GruneritePast Producer46.538, -88.171
Titan MineIronLimonite, GruneritePast Producer46.543, -88.183
Webster MineIronLimonite, GruneritePast Producer46.532, -88.141
Beaufort MineIronLimonite, GruneritePast Producer46.542, -88.179
Silver River Silver ProspectSilverSilverProspect46.758, -88.357
Huron Bay Slate CoSlate, DimensionSlatePast Producer46.776, -88.246
Bughole ExplorationVanadiumVanadiferous MagnetiteProspect46.683, -88.010
Skanee AreaLead, Vanadium, Zinc—Occurrence46.833, -88.250
Gomanche Creek Slate QuarryGranite—Past Producer46.763, -88.352
Northern Graphite Works QuarryGraphite—Past Producer46.647, -88.446
Imperial Mine——Past Producer46.531, -88.132
Ohio Mine -Includes Norwood Mine——Past Producer46.538, -88.171
Unnamed Silver ProspectSilver—Prospect46.758, -88.417
Portland Open Pit——Past Producer46.534, -88.153
Unnamed Vanadium ProspectVanadium—Occurrence46.854, -88.061
Imperial Iron MineIron—Past Producer46.531, -88.133
Unnamed Lead Zinc Uranium ProspectLead, Zinc, Uranium—Occurrence46.854, -88.056
Spurr Mine——Past Producer46.542, -88.131
Webster Mine——Past Producer46.533, -88.147
Unnamed Gold ProspectGold—Prospect46.747, -88.054
Unnamed Lead ProspectLead—Occurrence46.861, -88.083
Titan Mine——Past Producer46.541, -88.183
Taylor Mine——Past Producer46.663, -88.441
Detroit Graphite Co.Graphite QuarryGraphite—Past Producer46.635, -88.347
N.East Branch Slate QuarryGranite—Past Producer46.732, -88.309
Beaufort Mine——Past Producer46.541, -88.178
Unnamed Silver ProspectSilver—Prospect46.836, -88.090
Sidnaw Slate QuarryGranite—Past Producer46.557, -88.521
Steward——Prospect46.541, -88.142

Nearby counties

Marquette County · Iron County · Houghton County · Kent County · Dickinson County

Michigan mineral guides

Back to all Michigan counties.

How we built this page: we counted named sites in the USGS Mineral Resources Data System (MRDS) for this area, left out sand, gravel, crushed stone, clay pits and unnamed sites, grouped them by Census county, and linked every site to its USGS record. We did not visit these sites, and MRDS does not tell you who owns the land or whether collecting is allowed.

Source: USGS Mineral Resources Data System (MRDS). USGS ceased systematic updates to MRDS around 2011, so status and details may be out of date. Each site links to its USGS record.

Updated