Listed on the National Register of Historic Places in 1991. 10 historic topographic surveys show this location, the earliest from 1896.
From the record
“The Black Diamond Mines Regional Preserve is a 6,000-acre (2,400 ha) park located north of Mount Diablo in Contra Costa County, California under the administration of the East Bay Regional Park District (EBRPD). The district acquired the property in 1973.”
Wikipedia article Black Diamond Mines Regional Preserve, CC BY-SA 4.0.
One of 49 National Register listings published here for Contra Costa County · listed in 1991 · category: District.
National Register reference number.91001425- the number the National Park Service assigned this property when it was listed, and the key its nomination file is catalogued under at the National Archives.
Fires near this property
758 since 1992
Regional context, not property-specific
evidence. The
federal wildfire occurrence database
lists 758 fires within 5 miles of Black Diamond Mines
between 1992 and 2020, burning about 6,984 acres in total. None started naturally. 170 were recorded as arson.
Distance is straight-line from the map coordinates, so a fire counted
here may appear on a neighbouring settlement's page as well.
Reported cause
Fires
Missing data/not specified/undetermined
310
Arson/incendiarism
170
Misuse of fire by a minor
88
Smoking
86
Equipment and vehicle use
85
Debris and open burning
15
Power generation/transmission/distribution
3
Firearms and explosives use
1
The most recent of
them, most recent first, with the day each was reported and the service
that recorded it.
Date
Cause
Size
Reported by
Name on the report
9 September 2020
Missing data/not specified/undetermined
under an acre
Santa Clara Unit
not named
9 September 2019
Misuse of fire by a minor
3.0 acres
Santa Clara Unit
not named
9 September 2019
Arson/incendiarism
under an acre
Santa Clara Unit
not named
9 September 2011
Missing data/not specified/undetermined
1.0 acres
Santa Clara Unit
2-JUN
9 September 2011
Smoking
under an acre
Santa Clara Unit
not named
8 September 2019
Missing data/not specified/undetermined
under an acre
Santa Clara Unit
not named
8 September 2013
Firearms and explosives use
3,100 acres
Santa Clara Unit
MORGAN
7 September 2018
Missing data/not specified/undetermined
under an acre
California Department of Forestry & Fire Protection
Regional context, not property-specific
evidence. The federal mineral resources record lists
43 workings within 5 miles of Black Diamond Mines: 14 occurrences, 13 prospects, 9 past producers, 6 producers.
6 still produce. What was taken out: Silica, Mercury, Sand and Gravel, Construction, Stone. Distance is straight-line from the
map coordinates, so a quarry counted here may appear on a neighbouring
settlement's page as well.
United States Geological Survey topographic
sheets whose coverage includes this point. Matched by taking the middle of the area the National Park Service maps for this listing, then
testing that coordinate against the published boundary of every sheet.
Other National Register properties close
enough to walk or drive between, ordered by distance from this one. Both
positions come from the same geocoding pass that matched these properties
to their map sheets.
Listing record. National Park Service National Register of Historic Places, listed-properties dataset, current to 2026-05-22.
Map join. Address geocoded through the United States Census geocoder, then tested against the published boundary of every sheet in the USGS Historical Topographic Map Collection.
How this page is made. Listing fields come from federal records; map-sheet coverage is a labelled coordinate-to-boundary calculation, not a source-field claim.
Wildfire. Short, Karen C. 2022. Spatial wildfire occurrence data for the United States, 1992-2020 [FPA_FOD_20221014]. 6th Edition. Fort Collins, CO: Forest Service Research Data Archive. https://doi.org/10.2737/RDS-2013-0009.6 Collected with United States Government funding and usable without additional permissions or fees.
Mines and quarries. USGS Mineral Resources Data System (MRDS) https://mrdata.usgs.gov/mrds/ A work of the United States government, no copyright under 17 U.S.C. 105.
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