USA goldUS
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Shared layer · In 11 states

Historic Mill Claim Heatmap

Explorer

Density heatmap of closed mill site claims. Clusters mark where ore processing facilities once operated.

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4.7 / 5 from 2,400+ ratings on the App Store and Google Play · 10,000+ prospectors and detectorists
Historic Mill Claim Heatmap in Montana, drawn over satellite imagery© Mapbox, © Maxar

Satellite imagery © Mapbox, © Maxar. Layer data from the sources named on each card.

About this layer

Historic claim maps show where claims were recorded and later closed. Concentrations help you research patterns of earlier mining interest. Closed claims do not establish that land is currently unclaimed or open to detecting.

What it is for

Compare historic activity with current tenure, geology and access layers when researching an area.

Limits

An expired or closed record does not mean land is now open. Check current records and permissions separately.

Plans

Where it works in USA gold.

Explorer

Pictures

Drawn in each state.

Satellite imagery © Mapbox, © Maxar. Layer data from the sources named on each card.

Source

Where the data comes from.

For Alaska

Data provided by the U.S. Geological Survey (USGS), the Alaska Division of Geological & Geophysical Surveys (DGGS), the Alaska Department of Natural Resources (DNR), Bureau of Land Management (BLM), U.S. Forest Service (USFS), and ReportAll USA (Licensed), licensed under USGS Public Domain and other applicable licenses USGS Public Domain

For Arizona, California, Colorado, Idaho, Montana, Nevada, New Mexico, Oregon and 2 more

Data provided by the U.S. Geological Survey (USGS), Bureau of Land Management (BLM), U.S. Forest Service (USFS), and ReportAll USA (Licensed), licensed under USGS Public Domain and other applicable licenses USGS Public Domain

Legend

How it is drawn.

Closed Mill Claims
  • Low
  • Medium
  • High
Plans

What the pills mean.

Every layer shows the plan that opens it. The free plan never runs out. Prices are shown once, here.

Free

Open on every plan, forever. Includes gold records.

Explorer

Opens every base layer, and offline maps for the areas you choose. $59.99 a year or $7.99 a month.

Pro

Dynamic LiDAR and Terrain+ 3D models. Property boundaries with landowner names. Claim alerts. $99.99 a year or $11.99 a month.

7-day free trial on yearly plans · Nothing charged until it ends · Cancel anytime.

Prices are in US dollars.

Satellite imagery © Mapbox, © Maxar. Layer data from the sources named on each card.

Get Detector Maps

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Free to download on iPhone and Android.

Download on theApp StoreGet it onGoogle Play

On iPhone? Get it on the App StoreOn Android? Get it on Google Play

Free to download on iPhone and Android.

7-day free trial on yearly plans · Nothing charged until it ends · Cancel anytime.

Scan with your phone camera to get the app
Start free trialOpen the web map

On your phone: App Store · Google Play

7-day free trial on yearly plans · Nothing charged until it ends · Cancel anytime.

Or open the web map

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