How to Read a Mining Claims Map: Claim Types, Public Lands, and Terrain Layers

A mining claims map shows where mineral claims exist on a base map, lets you filter them by status and type, and layers terrain and land-ownership data on top so you can judge whether an area is worth prospecting. On ClaimLayer, that means viewing active and closed claims, narrowing by Lode, Mill, Placer, or Tunnel, checking U.S. Forest Service lands, and reading hillshade and slope layers together. The terrain and public-lands layers are part of the Premium plan ($10 USD/month, with a 3-day trial that requires no credit card), while the Free plan has a 5-minute daily map usage limit.

What the map actually shows

ClaimLayer reports 4.3+ million claims. Each claim appears on a base map (Basic, Satellite, or Topo) and carries two attributes you filter on:

• Status — active or closed
• Type — Lode, Mill, Placer, or Tunnel

Active vs. closed is the first thing to check. An active claim is currently held, so ground inside it is generally not open to you staking or prospecting without the claim holder's permission. A closed claim is no longer held — that doesn't automatically make it open, because the land underneath may still be withdrawn, private, or otherwise restricted, but it removes one obstacle. Treat status as a filter for "worth investigating," not as a legal green light.

Reading the four claim types

The type tells you what kind of mineral deposit or activity the claim covers, which in turn tells you what ground to look at.

A cluster of Placer claims along a drainage is a different signal than a scatter of Lode claims on a ridge. Use the type filter to match the ground you're actually equipped to work.

Narrowing to public land

The U.S. Forest Service layer highlights National Forest System lands, which is where a large share of prospecting activity happens. Turn it on to separate public ground from private inholdings and other jurisdictions, then look for claims that sit inside those boundaries. This layer is available with Premium.

The practical sequence: enable the USFS layer, filter to active claims of the type you want, and see where the two overlap. That overlap is your shortlist — not a permission slip. Before you go, confirm current claim status and land rules with the managing agency, since map data can lag reality.

Using hillshade and slope to judge terrain

These two layers answer different questions:

• Hillshade shades the terrain so you can see ridges, drainages, and contours — it makes the landscape readable.
• Slope shows steepness at a glance, so you can spot flats, benches, and gentle ground versus cliffs.

Combined, they let you rule out ground that's too steep to work and highlight benches and drainage margins that suit Placer-style prospecting. Both are Premium layers. A useful habit is to switch hillshade on first to orient yourself, then add slope to test whether a specific bench or gully is realistically accessible.

Planning and recording a route

Two tools turn the map into a plan:

• Custom map pins — drop markers on targets, access points, or things you want to check later.
• Distance measuring — measure how far a route or a claim dimension actually is on the ground.

Pin your shortlist, measure the walk in from the nearest road, and save the pins before you leave. The Free plan's 5-minute daily map limit makes extended planning sessions impractical, so if route-building is the main task, the Premium trial is the realistic way to do it.

Choosing a plan for map work

If you only need to confirm whether claims exist in a general area, the Free plan covers the claim data. If your task depends on terrain analysis or public-land filtering — which is most real prospecting planning — the Premium layers are the ones that matter, and the 3-day trial lets you test that workflow before paying.