{
  "publisher": "DogPolicies",
  "version": "2026.11.01",
  "schemaVersion": "1.2",
  "generatedAt": "2026-11-01",
  "as_of": "2026-11-01",
  "license": {
    "name": "CC BY 4.0",
    "url": "https://creativecommons.org/licenses/by/4.0/"
  },
  "attribution_text": "DogPolicies, dogpolicies.com, CC BY 4.0, verified 2026-11-01",
  "attribution_url": "https://dogpolicies.com/",
  "terms_url": "https://dogpolicies.com/terms/",
  "disclaimer": "Provided as is. Every fact names its source and the date it was checked; rules change between checks, so confirm with the agency or business before you go. Service animals are governed by the ADA, not these pet rules.",
  "attribution": "DogPolicies (https://dogpolicies.com)",
  "place": {
    "id": "black-diamond-mines-regional-preserve",
    "uid": "plc_aq0npc8m5zdwfx0s",
    "name": "Black Diamond Mines Regional Preserve",
    "type": "park",
    "url": "https://dogpolicies.com/places/black-diamond-mines-regional-preserve/",
    "canonical_url": "https://dogpolicies.com/places/black-diamond-mines-regional-preserve/",
    "markdown_url": "https://dogpolicies.com/places/black-diamond-mines-regional-preserve.md",
    "json_url": "https://dogpolicies.com/api/v1/places/black-diamond-mines-regional-preserve.json",
    "citation": "Black Diamond Mines Regional Preserve (Antioch, CA): Yes. Source: East Bay Regional Park District, checked 2026-10-28. DogPolicies record: https://dogpolicies.com/places/black-diamond-mines-regional-preserve/ (CC BY 4.0; cite with link).",
    "answer": {
      "status": "yes",
      "headline": "Yes."
    },
    "status": "published",
    "confirmedBy": null,
    "regionId": "bay-area",
    "areaId": "east-bay",
    "state": "CA",
    "county": "Contra Costa",
    "city": "Antioch",
    "address": "5175 Somersville Road",
    "zip": "94509",
    "geo": {
      "lat": 37.970838,
      "lon": -121.862767
    },
    "website": "https://www.ebparks.org/parks/black-diamond",
    "phone": null,
    "managingAgency": "East Bay Regional Park District",
    "brandId": null,
    "facts": {
      "dogsAllowed": {
        "value": "yes",
        "display": "Yes",
        "source": "park",
        "ruleId": "rul_aq0npc8m5zdwfx0s_dogsallowed",
        "confidence": "stated",
        "verifiedAt": "2026-10-28",
        "freshness": "fresh"
      },
      "restrictions": {
        "value": "Leashed dogs may enter the Greathouse Visitor Center; dogs are not allowed on mine tours.",
        "display": "Leashed dogs may enter the Greathouse Visitor Center; dogs are not allowed on mine tours.",
        "source": "park",
        "ruleId": "rul_aq0npc8m5zdwfx0s_restrictions",
        "confidence": "stated",
        "verifiedAt": "2026-10-28",
        "freshness": "fresh"
      },
      "leash": {
        "value": "varies",
        "display": "Varies by area",
        "source": "agency",
        "ruleId": "rul_aq0npc8m5zdwfx0s_leash",
        "confidence": "inferred_from_agency",
        "verifiedAt": "2026-10-28",
        "freshness": "fresh"
      },
      "maxLeashFt": {
        "value": 6,
        "display": "6 feet",
        "source": "agency",
        "ruleId": "rul_aq0npc8m5zdwfx0s_maxleashft",
        "confidence": "inferred_from_agency",
        "verifiedAt": "2026-10-28",
        "freshness": "fresh"
      }
    },
    "notStated": [],
    "tags": [],
    "rules": [
      "Dogs must be on a leash (6 feet maximum) in parking lots, picnic sites, lawns and other developed areas, within 200 feet of a trailhead or staging area, at posted areas, and wherever grazing animals are present.",
      "Dogs may be off leash in open space and undeveloped areas, if they stay in view, under voice control and return to the leash when called. Carry a 6-foot leash for each dog.",
      "No dogs at swimming pools, beaches, wetlands, marshes or designated nature study areas.",
      "Walking more than three of your own dogs, or walking dogs for a fee, needs a revocable annual district permit.",
      "Pick up your dog's waste and put it in a trash can or carry it out; never leave bags along a trail.",
      "Do not leave a dog unattended anywhere in the parks. Dangerous dogs are not allowed."
    ],
    "ruleRecords": [
      {
        "id": "rul_aq0npc8m5zdwfx0s_dogsallowed",
        "placeId": "black-diamond-mines-regional-preserve",
        "kind": "dogsAllowed",
        "label": "Dogs allowed",
        "value": "yes",
        "text": "Yes",
        "note": null,
        "source": "park",
        "sourceUrl": "https://www.ebparks.org/parks/black-diamond",
        "sourcePublisher": "East Bay Regional Park District",
        "sourceKind": "government",
        "quote": "Please note that while dogs on leash are allowed in the Greathouse Visitor Center, they are not permitted on Mine Tours.",
        "confidence": "stated",
        "inheritedFrom": null,
        "verifiedAt": "2026-10-28",
        "reviewDue": "2026-11-27",
        "freshness": "fresh"
      },
      {
        "id": "rul_aq0npc8m5zdwfx0s_restrictions",
        "placeId": "black-diamond-mines-regional-preserve",
        "kind": "restrictions",
        "label": "Official restrictions",
        "value": "Leashed dogs may enter the Greathouse Visitor Center; dogs are not allowed on mine tours.",
        "text": "Leashed dogs may enter the Greathouse Visitor Center; dogs are not allowed on mine tours.",
        "note": null,
        "source": "park",
        "sourceUrl": "https://www.ebparks.org/parks/black-diamond",
        "sourcePublisher": "East Bay Regional Park District",
        "sourceKind": "government",
        "quote": "Please note that while dogs on leash are allowed in the Greathouse Visitor Center, they are not permitted on Mine Tours.",
        "confidence": "stated",
        "inheritedFrom": null,
        "verifiedAt": "2026-10-28",
        "reviewDue": "2026-11-27",
        "freshness": "fresh"
      },
      {
        "id": "rul_aq0npc8m5zdwfx0s_leash",
        "placeId": "black-diamond-mines-regional-preserve",
        "kind": "leash",
        "label": "Leash",
        "value": "varies",
        "text": "Varies by area",
        "note": null,
        "source": "agency",
        "sourceUrl": "https://www.ebparks.org/safety/dogs",
        "sourcePublisher": "East Bay Regional Park District",
        "sourceKind": "government",
        "quote": "Dogs may be off-leash in open space and undeveloped areas of parklands, provided they are under control at all times.",
        "confidence": "inferred_from_agency",
        "inheritedFrom": null,
        "verifiedAt": "2026-10-28",
        "reviewDue": "2026-11-27",
        "freshness": "fresh"
      },
      {
        "id": "rul_aq0npc8m5zdwfx0s_maxleashft",
        "placeId": "black-diamond-mines-regional-preserve",
        "kind": "maxLeashFt",
        "label": "Maximum leash length",
        "value": 6,
        "text": "6 feet",
        "note": null,
        "source": "agency",
        "sourceUrl": "https://www.ebparks.org/safety/dogs",
        "sourcePublisher": "East Bay Regional Park District",
        "sourceKind": "government",
        "quote": "Dogs may be off-leash in open space and undeveloped areas of parklands, provided they are under control at all times.",
        "confidence": "inferred_from_agency",
        "inheritedFrom": null,
        "verifiedAt": "2026-10-28",
        "reviewDue": "2026-11-27",
        "freshness": "fresh"
      },
      {
        "id": "rul_aq0npc8m5zdwfx0s_rules",
        "placeId": "black-diamond-mines-regional-preserve",
        "kind": "rules",
        "label": "rules",
        "value": [
          "Dogs must be on a leash (6 feet maximum) in parking lots, picnic sites, lawns and other developed areas, within 200 feet of a trailhead or staging area, at posted areas, and wherever grazing animals are present.",
          "Dogs may be off leash in open space and undeveloped areas, if they stay in view, under voice control and return to the leash when called. Carry a 6-foot leash for each dog.",
          "No dogs at swimming pools, beaches, wetlands, marshes or designated nature study areas.",
          "Walking more than three of your own dogs, or walking dogs for a fee, needs a revocable annual district permit.",
          "Pick up your dog's waste and put it in a trash can or carry it out; never leave bags along a trail.",
          "Do not leave a dog unattended anywhere in the parks. Dangerous dogs are not allowed."
        ],
        "text": null,
        "note": null,
        "source": "agency",
        "sourceUrl": "https://www.ebparks.org/safety/dogs",
        "sourcePublisher": "East Bay Regional Park District",
        "sourceKind": "government",
        "quote": "Dogs may be off-leash in open space and undeveloped areas of parklands, provided they are under control at all times.",
        "confidence": "inferred_from_agency",
        "inheritedFrom": null,
        "verifiedAt": "2026-10-28",
        "reviewDue": "2026-11-27",
        "freshness": "fresh"
      }
    ],
    "sources": {
      "park": {
        "url": "https://www.ebparks.org/parks/black-diamond",
        "publisher": "East Bay Regional Park District",
        "title": "Black Diamond Mines Regional Preserve",
        "kind": "government",
        "capturedAt": "2026-10-28",
        "quote": "Please note that while dogs on leash are allowed in the Greathouse Visitor Center, they are not permitted on Mine Tours."
      },
      "location": {
        "url": "https://www.ebparks.org/parks/black-diamond",
        "publisher": "East Bay Regional Park District",
        "title": "Location: park entrance map link on Black Diamond Mines Regional Preserve page",
        "kind": "government",
        "capturedAt": "2026-10-28"
      },
      "agency": {
        "url": "https://www.ebparks.org/safety/dogs",
        "publisher": "East Bay Regional Park District",
        "title": "Dogs",
        "kind": "government",
        "capturedAt": "2026-10-28",
        "quote": "Dogs may be off-leash in open space and undeveloped areas of parklands, provided they are under control at all times."
      }
    },
    "verifications": [
      {
        "at": "2026-10-28",
        "by": "editor",
        "method": "page",
        "outcome": "confirmed",
        "facts": [
          "dogsAllowed",
          "leash",
          "maxLeashFt",
          "restrictions"
        ],
        "sources": [
          "park",
          "location"
        ],
        "note": "First verification, from the record's verifiedAt."
      }
    ],
    "verifiedAt": "2026-10-28",
    "reviewDue": "2026-11-27",
    "stale": false,
    "freshness": "fresh",
    "indexable": true,
    "provenance": "curated",
    "license": "CC-BY-4.0",
    "slugHistory": []
  }
}