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

St. Johns Mine + 1 more nearby (Past Producer)Unnamed Location (Unknown)Vallejo (Producer)Brownlie Property + 1 more nearby (Past Producer)Hastings Mine + 4 more nearby (Past Producer)Jerico Plant (Producer)
Past ProducerProducerProspectOccurrenceStatus unknown
6 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

St. Johns Mine

We picked it because its USGS record mentions 1 gem or collectible mineral (Quartz) and 1 of our card minerals overall. No other named site here scores as high on both counts. USGS lists it as past producer for Mercury. Minerals mentioned: Quartz. Approx. location 38.152, -122.193. 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?

6
Unknown

Status not recorded.

3
Past Producer

Produced ore or material at some point in the past.

2
Producer

Was producing when the record was made.

1
Occurrence

The mineral was noted here, without development.

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

Cinnabar 4Metacinnabar 1

Commodities

Mercury 10Calcium 1

Sites

SiteCommodityMinerals recordedStatusApprox. location
St. Johns MineMercuryCinnabarPast Producer38.152, -122.193
Borges Prospect—CinnabarOccurrence38.105, -122.174
Brownlie PropertyMercuryCinnabarPast Producer38.121, -122.182
Hastings MineMercuryCinnabar, MetacinnabarPast Producer38.114, -122.163
VallejoMercury—Producer38.200, -122.168
Unnamed LocationMercury—Unknown38.130, -122.178
Jerico PlantCalcium—Producer38.089, -121.853
St. John MineMercury—Unknown38.152, -122.193
Unnamed LocationMercury—Unknown38.132, -122.195
HastingsMercury—Unknown38.115, -122.167
Borges ProspectMercury—Unknown38.110, -122.177
Brownlie ProspectMercury—Unknown38.117, -122.178

Fossil collections

The Paleobiology Database lists 15 fossil collection records in Solano County. These are research records, not public dig sites.

Nearby counties

Contra Costa County · Marin County · San Francisco County · Napa County · San Mateo County

California mineral guides

Back to all California counties.

Related articles

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