# Relationship history for MSHA mine 1510358

Current hierarchy: **David J Stone → SNR RIVER OPS LLC → Lockwood Dock**

- 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:** Arch Coal Terminal Inc → Lockwood Dock; 1977-03-01 to 2014-12-22; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc et al → Lockwood Dock; 1977-03-01 to 1997-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Arch Coal Terminal Inc; 1977-03-01 to 1997-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Lockwood Dock; 1997-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Arch Coal Terminal Inc; 1997-07-10 to 2014-12-22; source msha-controller-operator-history
- **operator_operates_mine:** Sabbatical Inc. → Lockwood Dock; 2014-12-23 to 2018-01-07; source msha-controller-operator-history
- **controller_controls_mine:** Dennis  Johnson → Lockwood Dock; 2014-12-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Johnson → Sabbatical Inc.; 2014-12-23 to 2018-01-07; source msha-controller-operator-history
- **operator_operates_mine:** SNR RIVER OPS LLC → Lockwood Dock; 2018-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David J Stone → Lockwood Dock; 2018-01-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David J Stone → SNR RIVER OPS LLC; 2018-01-08 to current/open; source msha-controller-operator-history