# Relationship history for MSHA mine 1503746

Current hierarchy: **Jeffery A  Hoops → Cumberland River Coal Co → New Taggart Mine**

- 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

- **operator_operates_mine:** Blue Diamond Coal Company → New Taggart Mine; 1950-01-01 to 1990-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Blue Diamond Coal Company → New Taggart Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue Diamond Coal Company → Blue Diamond Coal Company; 1950-01-01 to 1990-10-07; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → New Taggart Mine; 1987-05-18 to 2005-12-11; source msha-controller-operator-history
- **operator_operates_mine:** Cumberland River Coal Co → New Taggart Mine; 1990-10-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Cumberland River Coal Co; 1990-10-08 to 2005-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → New Taggart Mine; 2005-12-12 to 2017-09-13; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Cumberland River Coal Co; 2005-12-12 to 2017-09-13; source msha-controller-operator-history
- **controller_controls_mine:** Jeffery A  Hoops → New Taggart Mine; 2017-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery A  Hoops → Cumberland River Coal Co; 2017-09-14 to current/open; source msha-controller-operator-history