# Relationship history for MSHA mine 1516349

Current hierarchy: **James River Coal Company → Blue Diamond Coal Company → Calvary No. 80**

- 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:** Blue Diamond Coal Company → Calvary No. 80; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Petrofina Oil Company et al → Calvary No. 80; 1986-11-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Prince Mining Company → Calvary No. 80; 1988-04-01 to 1992-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Petrofina Oil Company et al → Kentucky Prince Mining Company; 1988-04-01 to 1992-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Amax Inc  et al → Kentucky Prince Mining Company; 1988-04-01 to 1992-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Collins → Calvary No. 80; 1992-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sovereign Mining Company → Calvary No. 80; 1992-04-29 to 1995-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Leroy  Lackey et al → Calvary No. 80; 1992-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leroy  Lackey et al → Sovereign Mining Company; 1992-04-29 to 1995-04-16; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Company → Calvary No. 80; 1995-04-17 to 1995-05-21; source msha-controller-operator-history
- **controller_controls_operator:** Blue Diamond Coal Company → Blue Diamond Coal Company; 1995-04-17 to 1995-05-21; source msha-controller-operator-history
- **operator_operates_mine:** Calvary Coal Co. Inc → Calvary No. 80; 1995-05-22 to 2004-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Collins → Calvary Coal Co. Inc; 1995-05-22 to 2004-02-04; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → Calvary No. 80; 1998-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Co. → Calvary No. 80; 2004-02-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Blue Diamond Coal Co.; 2004-02-05 to current/open; source msha-controller-operator-history