Black Diamond Mines Regional Preserve

Park

Plan with 4 source-backed facts, 3 related records, and explicit uncertainty.

Plan a visit

Facilities and services

Reserveamerica campsite inventory

Recorded for: Black Diamond Mines ReserveAmerica Facility

Facility id
110452
Products
  • Product id
    1101
    Site id
    group-camp-black-diamond-star-mine
    Maximum people
    35
  • Product id
    1102
    Site id
    backpack-camp-black-diamond-stewartville
    Maximum people
    20
Evidence and sources (1)

No claim effective interval recorded.

Spatial scope IDs: scope-black-diamond-mines-regional-preserve

  1. Evidence stance: supports · Evidence details

    Evidence notes: Live booking inventory product mappings.

    ReserveAmerica lists Star Mine as product 1101 (35) and Stewartville as product 1102 (20), with Stewartville closed November 1 through March 31.

    Publisher
    ReserveAmerica / East Bay Regional Park District
    Observer / attribution
    Wayproof browser source review
    Observed at
    Unknown
    Retrieved at
    2026-09-22T00:00:00-07:00

    Retrieval time does not establish when an event occurred.

    Observation details · Source details · Original source: ReserveAmerica / East Bay Regional Park District

    Recorded artifact references
    • Facility EB/110452
    • Products 1101-1102

    References are not a confirmation of current availability.

Site inventory

Recorded for: Black Diamond Mines Regional Preserve

Star mine
Site id
group-camp-black-diamond-star-mine
Maximum people
35
Maximum nights
2
Maximum cars
8
Picnic tables
Yes
Pit toilet
Yes
Water available
No
Minimum advance business days
3
Stewartville
Site id
backpack-camp-black-diamond-stewartville
Maximum people
20
Maximum nights
2
Hike in distance miles
3.2
Picnic tables
Yes
Pit toilet
Yes
Water
non potable treat before human use
Minimum advance business days
2
Evidence and sources (1)

No claim effective interval recorded.

Spatial scope IDs: scope-black-diamond-mines-regional-preserve

  1. Evidence stance: supports · Evidence details

    Evidence notes: Official park camping details.

    Star Mine is an organized educational group camp for up to 35, two-night maximum, eight cars, picnic tables, pit toilet, no water, and three-business-day booking. Stewartville holds 20, is 3.2 miles from headquarters, has picnic tables, pit toilet and non-potable horse water, a two-night maximum, and two-business-day booking.

    Publisher
    East Bay Regional Park District
    Observer / attribution
    Wayproof web source review
    Observed at
    Unknown
    Retrieved at
    2026-09-22T00:00:00-07:00

    Retrieval time does not establish when an event occurred.

    Observation details · Source details · Original source: East Bay Regional Park District

    Recorded artifact references
    • Camping

    References are not a confirmation of current availability.

More planning facts

Managed land boundary geometry

Recorded for: Black Diamond Mines Regional Preserve

Boundary geometry snapshot
Feature ids
  • ebrpd:15
  • ebrpd:539
Path
geometry/v0/snapshots/ebrpd-managed-land-boundaries-20260924.geojson
Sha256
4e6558956f4f397816d719ff87554289e08dd495314b2d57c83d1634f083e3e5
Boundary type
managed land status polygons
Coordinate precision decimal degrees
5
Coordinate reference system
EPSG:4326
Navigation grade
No
Evidence and sources (1)

No claim effective interval recorded.

No claim spatial scope recorded.

  1. Evidence stance: supports · Evidence details

    Evidence notes: Supports the selected source polygons and their retained boundary semantics.

    EBRPD's open-data layer reports the selected current managed-land polygons; parkland and landbank status remain separate.

    Publisher
    East Bay Regional Park District
    Observer / attribution
    Not recorded
    Observed at
    Unknown
    Retrieved at
    2026-09-24T22:00:00+00:00

    Retrieval time does not establish when an event occurred.

    Observation details · Source details · Original source: East Bay Regional Park District

    Recorded artifact references
    • geometry/v0/snapshots/ebrpd-managed-land-boundaries-20260924.geojson

    References are not a confirmation of current availability.

Visitor profile

Recorded for: Black Diamond Mines Regional Preserve

Acreage
8533
Address
5175 Somersville Road, Antioch, CA 94509
Camping
Star mine group camp
Capacity
35
Minimum advance business days
3
Pit toilet
Yes
Water
No
Stewartville backpack camp
Capacity
20
Distance from headquarters miles
3.2
Minimum advance business days
2
Pit toilet
Yes
Water
non-potable horse water; treat for human use
Mine access
Beyond the visitor center only through the Coal Mine Experience; minimum age 7
Parking fee condition
when kiosk is attended; seasonal weekends and some holidays
Parking fee usd
5
Seasonal gate hours
08:00 opening; closing varies from 17:00 to 20:00 by published date bands
Evidence and sources (1)

No claim effective interval recorded.

Spatial scope IDs: scope-black-diamond-mines-regional-preserve

  1. Evidence stance: supports · Evidence details

    Evidence notes: Direct transcription and conservative structuring of planning-relevant fields from the official park page.

    The live park page publishes the visitor profile represented by the associated claim, including access, operating information, facilities, and material restrictions.

    Publisher
    East Bay Regional Park District
    Observer / attribution
    Wayproof live source review
    Observed at
    Unknown
    Retrieved at
    2026-09-20T07:00:00+00:00

    Retrieval time does not establish when an event occurred.

    Observation details · Source details · Original source: East Bay Regional Park District

    Recorded artifact references
    • Overview
    • To Reach The Park
    • Attractions

    References are not a confirmation of current availability.

Explore related places

Places and facilities (2)

Routes and related places (1)

Before you go

No direct knowledge gap is linked to this entity. That does not mean the record is complete.

Sources, evidence, and history

Planning facts above are readable first. Open these records when you need to audit a source or see when knowledge changed.

Evidence for 4 published claims
Published ChangeSet history

Canonical data is historical evidence, not a guarantee of current conditions. Recheck volatile facts before travel.