# Relationship history for MSHA mine 1518733

Current hierarchy: **Clark D  Pergrem → Black Gem Coal Sales Inc → #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Brian  Jones → #1; 2002-09-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dennis Mining LLC → #1; 2004-03-19 to 2004-07-28; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Jones → Dennis Mining LLC; 2004-03-19 to 2004-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Green River Mining Company Inc. → #1; 2004-07-29 to 2005-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Golden  Sandlin et al → #1; 2004-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Golden  Sandlin et al → Green River Mining Company Inc.; 2004-07-29 to 2005-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Clark D  Pergrem → #1; 2004-09-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Double E Mining LLC → #1; 2005-06-23 to 2005-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Earl Ray  Lawson → #1; 2005-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earl Ray  Lawson → Double E Mining LLC; 2005-06-23 to 2005-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Black Gem Coal Sales Inc → #1; 2005-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clark D  Pergrem → Black Gem Coal Sales Inc; 2005-12-08 to current/open; source msha-controller-operator-history