{"data":{"schemaVersion":"realm.mine-profile.v1","generatedAt":"2026-10-13T11:26:59.401Z","identity":{"mine_id":"3400120","name":"MARKLAND PIT","status":"Abandoned","status_date":"2003-02-27","mine_type":"Surface","coal_metal":"M","commodity":"Common Clays NEC","state":"OK","county":"Oklahoma","nearest_town":"Oklahoma City","operator_id":"L17877","operator_name":"Acme Brick Company","controller_id":"M13643","controller_name":"Berkshire Hathaway Inc","district":"M5","office":"Norman OK Field Office","employees":0,"latitude":null,"longitude":null},"coverage":{"contributingSources":6,"registeredSources":20,"sourceRows":30},"relationships":{"schemaVersion":"realm.temporal-relationships.v1","temporalSemantics":{"validTime":{"granularity":"date","bounds":"inclusive","nullStart":"start date not published in the upstream history row","nullEnd":"open-ended in the upstream history row; not independent proof of present control"},"transactionTime":{"observedAt":"2026-10-13T11:19:05.459773+00:00","meaning":"time the checksum-addressed MDRS artifacts were observed by the PostgreSQL ingestion"},"derivation":{"controllerControlsOperator":"intersection of controller and operator valid-time intervals evidenced through this mine","currentIdentity":"current controller and operator are asserted only by the MDRS Mines snapshot"}},"current":{"mine":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"operator":{"type":"operator","id":"L17877","name":"Acme Brick Company"},"controller":{"type":"controller","id":"M13643","name":"Berkshire Hathaway Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00009","name":"Justin Industries Inc"},"object":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|M00009|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L04239","name":"Oklahoma Brick & Block Corp"},"object":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"validFrom":"1950-01-01","validTo":"1986-04-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|L04239|1950-01-01|1986-04-16"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M03413","name":"Oklahoma Brick Corp"},"object":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"validFrom":"1950-01-01","validTo":"1986-04-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|M03413|1950-01-01|1986-04-16"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M03413","name":"Oklahoma Brick Corp"},"object":{"type":"operator","id":"L04239","name":"Oklahoma Brick & Block Corp"},"validFrom":"1950-01-01","validTo":"1986-04-16","current":false,"derived":true,"evidenceMineId":"3400120","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|L04239|1950-01-01|M03413|1950-01-01|128990"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00202","name":"Boral Limited"},"object":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"validFrom":"1985-07-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|M00202|1985-07-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L10289","name":"Henderson Brick"},"object":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"validFrom":"1986-04-17","validTo":"1996-11-05","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|L10289|1986-04-17|1996-11-05"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00202","name":"Boral Limited"},"object":{"type":"operator","id":"L10289","name":"Henderson Brick"},"validFrom":"1986-04-17","validTo":"1996-11-05","current":false,"derived":true,"evidenceMineId":"3400120","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|L10289|1986-04-17|M00202|1985-07-01|107342"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00104","name":"Acme Brick Company"},"object":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"validFrom":"1996-11-06","validTo":"2001-05-17","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|L00104|1996-11-06|2001-05-17"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00009","name":"Justin Industries Inc"},"object":{"type":"operator","id":"L00104","name":"Acme Brick Company"},"validFrom":"1996-11-06","validTo":"2001-05-17","current":false,"derived":true,"evidenceMineId":"3400120","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|L00104|1996-11-06|M00009|1950-01-01|101207"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M13643","name":"Berkshire Hathaway Inc"},"object":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"validFrom":"2000-07-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|M13643|2000-07-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L17877","name":"Acme Brick Company"},"object":{"type":"mine","id":"3400120","name":"MARKLAND PIT"},"validFrom":"2001-05-18","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|L17877|2001-05-18|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M13643","name":"Berkshire Hathaway Inc"},"object":{"type":"operator","id":"L17877","name":"Acme Brick Company"},"validFrom":"2001-05-18","validTo":null,"current":true,"derived":true,"evidenceMineId":"3400120","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400120|L17877|2001-05-18|M13643|2000-07-01|156660"}}],"coverage":{"historyRecords":4,"edgeCount":12,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"sources":[{"id":"msha-addresses","name":"Addresses of Record","domains":["identity","logistics"],"products":["entity resolution","address history","facility geocoding"],"rowCount":1,"firstDate":"2003-02-27","lastDate":"2003-02-27","metrics":{},"periods":{},"recentRecords":[]},{"id":"msha-controller-operator-history","name":"Controller and Operator History","domains":["identity","compliance"],"products":["historical ownership attribution","operator transitions","valid-time joins"],"rowCount":4,"firstDate":"1950-01-01","lastDate":"2001-05-18","metrics":{"recentRows":0,"currentOperatorTenures":1,"completedOperatorTenures":3},"periods":{},"recentRecords":[]},{"id":"msha-inspections","name":"Inspections","domains":["safety","compliance"],"products":["inspection mix","on-site hours","event context","citation rate denominator"],"rowCount":3,"firstDate":"2001-09-20","lastDate":"2002-10-25","metrics":{"inspectors":3,"recentRows":0,"onSiteHours":5,"inspectionHours":10,"inspectionSamples":0},"periods":{},"recentRecords":[{"SOURCE_ROW_NUMBER":"872926","EVENT_NO":"1018574","INSPECTION_BEGIN_DT":"10/25/2002","INSPECTION_END_DT":"10/25/2002","ACTIVITY_CODE":"46","ACTIVITY":"SPECIAL ENFORCEMENT 4","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"2","SUM_TOTAL_ON_SITE_HOURS":"1","sourceDate":"2002-10-25"},{"SOURCE_ROW_NUMBER":"508622","EVENT_NO":"1014830","INSPECTION_BEGIN_DT":"08/13/2002","INSPECTION_END_DT":"08/13/2002","ACTIVITY_CODE":"01","ACTIVITY":"REGULAR INSPECTION","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"4","SUM_TOTAL_ON_SITE_HOURS":"2","sourceDate":"2002-08-13"},{"SOURCE_ROW_NUMBER":"294430","EVENT_NO":"0796091","INSPECTION_BEGIN_DT":"09/20/2001","INSPECTION_END_DT":"09/20/2001","ACTIVITY_CODE":"01","ACTIVITY":"REGULAR INSPECTION","NBR_INSPECTOR":"1","SUM_TOTAL_INSP_HOURS":"4","SUM_TOTAL_ON_SITE_HOURS":"2","sourceDate":"2001-09-20"}]},{"id":"msha-mine-production-quarterly","name":"Mine Employment and Production — Quarterly","domains":["production","safety","compliance"],"products":["production trend","employee hours","rate denominators","seasonality"],"rowCount":17,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2003-Q1":{"hours":0,"employees":0,"production":0},"2002-Q4":{"hours":0,"employees":0,"production":0},"2002-Q3":{"hours":0,"employees":0,"production":0},"2002-Q2":{"hours":0,"employees":0,"production":0},"2002-Q1":{"hours":4070,"employees":5,"production":0},"2001-Q4":{"hours":0,"employees":0,"production":0},"2000-Q4":{"hours":3,"employees":1,"production":0},"2000-Q3":{"hours":2300,"employees":6,"production":0},"2000-Q2":{"hours":1,"employees":1,"production":0},"2000-Q1":{"hours":1,"employees":1,"production":0}},"recentRecords":[]},{"id":"msha-mine-production-yearly","name":"Mine Employment and Production — Yearly","domains":["production","safety","compliance"],"products":["annual trend","backfill","quarterly reconciliation"],"rowCount":4,"firstDate":null,"lastDate":null,"metrics":{},"periods":{"2000":{"hours":2305,"employees":6,"production":0},"2002":{"hours":4070,"employees":5,"production":0}},"recentRecords":[]},{"id":"msha-mines","name":"Mines","domains":["identity","production","logistics"],"products":["mine identity","status","commodity","location","operator and controller"],"rowCount":1,"firstDate":null,"lastDate":null,"metrics":{},"periods":{},"recentRecords":[]}],"safety":{"href":"/api/v1/mines/3400120/safety","description":"Full-period safety series, top CFR sections and paginated activity. Requires PostgreSQL."},"silica":{"href":"/api/v1/mines/3400120/silica","description":"Dedicated silica records, measurements, sample status and trends. Defaults to the snapshot year; use year=all for history."},"externalContext":{"eia":null,"title30":{"snapshot":{"chapterCount":6,"featuredSectionCount":100,"latestAmendedOn":"2026-08-14","latestIssueDate":"2026-08-14","partCount":206,"sectionCount":5954,"upToDateAsOf":"2026-08-19"},"regulations":[],"fullCorpus":"/data/title30-sections.json"}}},"meta":{"representation":"json","mineId":"3400120","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804}}