{"data":{"schemaVersion":"realm.mine-profile.v1","generatedAt":"2026-10-17T06:17:15.228Z","identity":{"mine_id":"1100066","name":"Thornton Quarry","status":"Active","status_date":"2013-06-25","mine_type":"Surface","coal_metal":"M","commodity":"Crushed, Broken Limestone NEC","state":"IL","county":"Cook","nearest_town":"Thornton","operator_id":"L16286","operator_name":"Heidelberg Materials Midwest Agg, Inc.","controller_id":"M00004","controller_name":"Heidelberg Materials AG","district":"M4","office":"Peru IL Field Office","employees":75,"latitude":41.565833,"longitude":-87.613611},"coverage":{"contributingSources":15,"registeredSources":20,"sourceRows":3121},"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 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