# Relationship history for MSHA mine 4606814

Current hierarchy: **Ward Frankie B → Bw Mining Inc → Big Creek #2**

- 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:** Ruth  Prater  et al → Big Creek #2; 1984-06-01 to 1994-02-14; source msha-controller-operator-history
- **operator_operates_mine:** Resources Development Corp → Big Creek #2; 1984-07-01 to 1987-02-17; source msha-controller-operator-history
- **controller_controls_operator:** Ruth  Prater  et al → Resources Development Corp; 1984-07-01 to 1987-02-17; source msha-controller-operator-history
- **controller_controls_mine:** Lawson Charles W → Big Creek #2; 1986-10-06 to 1989-06-24; source msha-controller-operator-history
- **operator_operates_mine:** Big Creek Mining Inc → Big Creek #2; 1987-02-18 to 1988-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Ward Frankie B → Big Creek #2; 1987-02-18 to 1988-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Ward Frankie B → Big Creek Mining Inc; 1987-02-18 to 1988-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Ward Frankie B → Big Creek #2; 1987-02-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R B J Coal Company Inc → Big Creek #2; 1988-03-07 to 1988-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Lawson Charles W → R B J Coal Company Inc; 1988-03-07 to 1988-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Clear Water W & L Coal Inc → Big Creek #2; 1988-11-04 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ward Frankie T → Big Creek #2; 1988-11-04 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ward Frankie T → Clear Water W & L Coal Inc; 1988-11-04 to 1988-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Bw Mining Inc → Big Creek #2; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ward Frankie B → Bw Mining Inc; 1989-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Nicewonder → Big Creek #2; 2005-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Nicewonder → Big Creek Mining Inc; 2005-11-01 to 1988-03-06; source msha-controller-operator-history