# Relationship history for MSHA mine 4608891

Current hierarchy: **John W  Smith → Alpha & Omega Coal Company LLC → Dingess Tunnel No 1 Deep 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Marrowbone Development Company → Dingess Tunnel No 1 Deep Mine; 2001-04-01 to 2004-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Dingess Tunnel No 1 Deep Mine; 2001-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Marrowbone Development Company; 2001-04-01 to 2004-09-30; source msha-controller-operator-history
- **operator_operates_mine:** LCC West Virginia LLC → Dingess Tunnel No 1 Deep Mine; 2004-10-01 to 2005-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Lexington Coal Company LLC → Dingess Tunnel No 1 Deep Mine; 2004-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lexington Coal Company LLC → LCC West Virginia LLC; 2004-10-01 to 2005-03-28; source msha-controller-operator-history
- **operator_operates_mine:** Southern West Virginia Resources, LLC → Dingess Tunnel No 1 Deep Mine; 2005-03-29 to 2005-06-04; source msha-controller-operator-history
- **controller_controls_mine:** CONSOL Energy Inc → Dingess Tunnel No 1 Deep Mine; 2005-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CONSOL Energy Inc → Southern West Virginia Resources, LLC; 2005-03-29 to 2005-06-04; source msha-controller-operator-history
- **operator_operates_mine:** Alpha & Omega Coal Company LLC → Dingess Tunnel No 1 Deep Mine; 2005-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John W  Smith → Dingess Tunnel No 1 Deep Mine; 2005-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John W  Smith → Alpha & Omega Coal Company LLC; 2005-06-05 to current/open; source msha-controller-operator-history