# Relationship history for MSHA mine 1512753

Current hierarchy: **Sev.en Global Investments a.s. → Blue Diamond Coal Co → Calvary No 81**

- 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 81; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Consumers Coal Company → Calvary No 81; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pargas Inc → Calvary No 81; 1973-03-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → Calvary No 81; 1981-03-01 to 1983-12-20; source msha-controller-operator-history
- **controller_controls_operator:** Pargas Inc → River Processing Inc; 1981-03-01 to 1983-12-20; source msha-controller-operator-history
- **operator_operates_mine:** River Processing Inc → Calvary No 81; 1983-12-21 to 1985-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Coal Ridge Fuels Of Hazard Inc → Calvary No 81; 1983-12-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Coal Ridge Fuels Of Hazard Inc → River Processing Inc; 1983-12-21 to 1985-05-27; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Prince Coal Corp → Calvary No 81; 1985-05-28 to 1986-11-19; source msha-controller-operator-history
- **controller_controls_operator:** Consumers Coal Company → Kentucky Prince Coal Corp; 1985-05-28 to 1986-11-19; source msha-controller-operator-history
- **operator_operates_mine:** Kentucky Prince Mining Company → Calvary No 81; 1986-11-20 to 1992-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Amax Inc  et al → Calvary No 81; 1986-11-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amax Inc  et al → Kentucky Prince Mining Company; 1986-11-20 to 1992-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Petrofina Oil Company et al → Kentucky Prince Mining Company; 1986-11-20 to 1992-04-28; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Collins → Calvary No 81; 1992-02-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sovereign Mining Company → Calvary No 81; 1992-04-29 to 1995-04-16; source msha-controller-operator-history
- **controller_controls_mine:** Leroy  Lackey et al → Calvary No 81; 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 81; 1995-04-17 to 1999-01-27; source msha-controller-operator-history
- **controller_controls_operator:** Blue Diamond Coal Company → Blue Diamond Coal Company; 1995-04-17 to 1999-01-27; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → Calvary No 81; 1998-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calvary Coal Co. Inc → Calvary No 81; 1999-01-28 to 2004-02-04; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Collins → Calvary Coal Co. Inc; 1999-01-28 to 2004-02-04; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Co → Calvary No 81; 2004-02-05 to 2014-09-03; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Blue Diamond Coal Co; 2004-02-05 to 2014-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Co → Calvary No 81; 2014-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → Calvary No 81; 2014-09-04 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Blue Diamond Coal Co; 2014-09-04 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sev.en Global Investments a.s. → Calvary No 81; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sev.en Global Investments a.s. → Blue Diamond Coal Co; 2020-06-01 to current/open; source msha-controller-operator-history