# Relationship history for MSHA mine 1518857

Current hierarchy: **Robert O  Roan → M & G Mining, LLC → M & G Mining #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:** Robert O  Roan → M & G Mining #1; 2001-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** National Coal Corporation → M & G Mining #1; 2003-05-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ROCO Enterprises → M & G Mining #1; 2005-03-17 to 2006-08-06; source msha-controller-operator-history
- **controller_controls_operator:** Robert O  Roan → ROCO Enterprises; 2005-03-17 to 2006-08-06; source msha-controller-operator-history
- **operator_operates_mine:** National Coal Corporation → M & G Mining #1; 2006-08-07 to 2007-03-11; source msha-controller-operator-history
- **controller_controls_operator:** National Coal Corporation → National Coal Corporation; 2006-08-07 to 2007-03-11; source msha-controller-operator-history
- **operator_operates_mine:** M & G Mining, LLC → M & G Mining #1; 2007-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert O  Roan → M & G Mining #1; 2007-03-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert O  Roan → M & G Mining, LLC; 2007-03-12 to current/open; source msha-controller-operator-history