# Relationship history for MSHA mine 1516638

Current hierarchy: **Horizon Natural Resources Incorporated → Clark Elkhorn Coal Co. → Clark Elkhorn 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

- **controller_controls_mine:** Lester Douglas M & James E Blair → Clark Elkhorn Mine; 1976-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elmer  Fuller et al → Clark Elkhorn Mine; 1979-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Van Dyke Ray-Virgle-Harold Et Al → Clark Elkhorn Mine; 1987-05-01 to 2000-11-05; source msha-controller-operator-history
- **operator_operates_mine:** Husky Coal Company Inc → Clark Elkhorn Mine; 1989-08-01 to 1994-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Eddie  Holbrooks → Clark Elkhorn Mine; 1989-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eddie  Holbrooks → Husky Coal Company Inc; 1989-08-01 to 1994-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Jerold & Jeffrey Coal Company Inc → Clark Elkhorn Mine; 1994-12-01 to 1995-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Lester Douglas M & James E Blair → Jerold & Jeffrey Coal Company Inc; 1994-12-01 to 1995-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Sunrise Mining Inc → Clark Elkhorn Mine; 1995-10-30 to 2000-11-05; source msha-controller-operator-history
- **controller_controls_operator:** Van Dyke Ray-Virgle-Harold Et Al → Sunrise Mining Inc; 1995-10-30 to 2000-11-05; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Clark Elkhorn Mine; 1998-09-02 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kyn Coal Company Inc → Clark Elkhorn Mine; 2000-11-06 to 2001-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Elmer  Fuller et al → Kyn Coal Company Inc; 2000-11-06 to 2001-05-15; source msha-controller-operator-history
- **controller_controls_operator:** Susie A  Smith et al → Kyn Coal Company Inc; 2000-11-06 to 2001-05-15; source msha-controller-operator-history
- **operator_operates_mine:** K & C Coal Corp → Clark Elkhorn Mine; 2001-05-16 to 2002-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Theresa  Chafin → Clark Elkhorn Mine; 2001-05-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theresa  Chafin → K & C Coal Corp; 2001-05-16 to 2002-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Co. → Clark Elkhorn Mine; 2002-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Clark Elkhorn Coal Co.; 2002-06-24 to current/open; source msha-controller-operator-history