Manganese occurrence · Humboldt County, California
discovered 1918
Drawn as a mineral occurrence: a place where a geologist noted the mineral, with no mining recorded. The ore color stands for manganese. Federal records note the kind of operation and its status, not its depth or layout, so this is a typical example rather than a survey of this site.
| State | California |
| County | Humboldt |
| Coordinates | 40.37845, -123.61892 |
| Tertiary | Manganese |
| Status | Occurrence |
| Discovery Year | 1918 |
| Data Source | USGS MRDS |
| Source ID | 10187796 |
| Site | Distance | Commodity | Status |
|---|---|---|---|
| Unnamed Location near Mad River, CA | 2.1 mi | Manganese | Prospect |
| Martin and Murphy Claim | 2.1 mi | Occurrence | |
| Unnamed Location near Mad River, CA | 2.3 mi | Occurrence | |
| Martin and Murphy Claim | 2.3 mi | Occurrence | |
| Unknown near Mad River, CA | 3.5 mi | Chromium | Occurrence |
| Unnamed Location near Mad River, CA | 3.5 mi | Chromium | Producer |
| Unnamed Location near Mad River, CA | 3.5 mi | Chromium | Prospect |
| Unknown near Phillipsville, CA | 3.6 mi | Manganese | Occurrence |
| Unnamed Manganese near Phillipsville, CA | 3.7 mi | Manganese | Prospect |
| Burns Prospect | 3.7 mi | Occurrence | |
| A.b.c. Manganese Claim | 3.9 mi | Occurrence | |
| Windbigler No. 2 Prospect | 3.9 mi | Occurrence |
This location is classified as a mineral prospect or occurrence — a site where minerals have been identified but no significant mining has taken place. These sites typically have minimal environmental impact but indicate the presence of mineral deposits in the area.