# Relationship history for MSHA mine 1516020

Current hierarchy: **Iracoal Incorporated → Lodestar Energy Inc → Smith Underground No 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:** Costain Group PLC → Smith Underground No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pyro Energy Corp → Smith Underground No 1; 1988-05-18 to 1994-05-04; source msha-controller-operator-history
- **operator_operates_mine:** J Smith Coal Inc → Smith Underground No 1; 1989-03-01 to 1994-05-04; source msha-controller-operator-history
- **controller_controls_operator:** Pyro Energy Corp → J Smith Coal Inc; 1989-03-01 to 1994-05-04; source msha-controller-operator-history
- **operator_operates_mine:** Costain Coal Inc → Smith Underground No 1; 1994-05-05 to 1997-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → Costain Coal Inc; 1994-05-05 to 1997-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Iracoal Incorporated → Smith Underground No 1; 1997-01-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lodestar Energy Inc → Smith Underground No 1; 1997-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Iracoal Incorporated → Lodestar Energy Inc; 1997-07-21 to current/open; source msha-controller-operator-history