Drill Results Map — California

California — birthplace of the 1849 Gold Rush and home to the Mountain Pass rare earth mine, the only REE producer in the US — is a prime target for junior exploration companies. Here's how to create a professional drill results map using Exploration Maps in 15–30 minutes.

Example drill results map created in Exploration Maps — Example drill results map exported from Exploration Maps — style your California data the same way.

About Mining in California

California's Mother Lode district ignited the 1849 Gold Rush and continues to host active gold exploration and production, alongside the Mountain Pass rare earth mine — the only REE producer in the United States.

Key minerals: gold, silver, boron, tungsten, chromite, rare earth elements. Notable deposits: Motherlode, Grass Valley, Mountain Pass REE, Randsburg. Mining districts: Mother Lode, Grass Valley-Nevada City, Death Valley, Mojave.

The Bureau of Land Management (BLM) administers mineral rights in California. Claim data is accessible through BLM MLRS (Mineral & Land Records System).

Getting Mining Data for California

Portal	Formats	Notes
BLM MLRS (Mineral & Land Records System)	MLRS reports + map viewer (claims by legal description)	California BLM claims use UTM Zone 10N (EPSG:32610) for most of the state; southeastern desert properties (Death Valley, Mojave) fall in Zone 11N. California's CEQA environmental review process is a key permitting consideration — note permit status in your title block subtitle where relevant for regulatory filings.

How to Create a Drill Results Map for California

For a full step-by-step guide to drill results maps, see How to Make a Drill Results Map.

Import your drill collar CSV (columns: hole ID, latitude, longitude, depth, assay)
Assign the Drillholes layer role
Import the property claims boundary as GeoJSON
Add callout labels to key holes showing hole ID and best intercept
Use Badge Label type to highlight the highest-grade holes
Configure the title with program name and date
Set the Landscape 16:9 ratio for news release figures
Export as PNG at 2× for email and PDF for the news release attachment

Labelling a drillhole with its best intercept in Exploration Maps.

Tip for California: The Mother Lode Belt runs 200 km north-south through the Sierra Nevada foothills — a regional inset showing the full belt extent and your property's position within it gives investors the scale and geological context that makes a Mother Lode project compelling.

Recommended Settings for California

Basemap: Light or Satellite
Design theme: Investor — Navy & White
Export format: PNG at 2× for investor presentations, PDF (Letter or A4) for NI 43-101 reports
Coordinate system: Ensure source data is in WGS84 (EPSG:4326)

Common Use Cases in California

Exploration news releases
NI 43-101 technical reports
Investor day presentations
Analyst briefings

Frequently Asked Questions

What file format do I need for California mineral claims data?

California mineral claims boundaries are available from BLM MLRS (Mineral & Land Records System) and can typically be downloaded as Shapefiles or KML. Convert these to GeoJSON at mapshaper.org before importing into Exploration Maps.

Who regulates mineral claims in California?

Mineral claims in California are regulated by the Bureau of Land Management (BLM). All tenure and claims data can be queried through BLM MLRS (Mineral & Land Records System).

What minerals are typically mapped in California?

California is known for its gold, silver, boron, tungsten deposits. Key producing and exploration-stage properties include Motherlode, Grass Valley, Mountain Pass REE. The main mining districts are Mother Lode, Grass Valley-Nevada City, Death Valley.

Can I export a California drill results map for a NI 43-101 report?

Yes. Exploration Maps exports PNG and PDF at 2–3× pixel ratio, suitable for inclusion in NI 43-101 technical reports as required figures. The export includes north arrow, scale bar, legend, and title block — all standard map elements required for NI 43-101 compliance.