# Relationship history for MSHA mine 4606062

Current hierarchy: **Russell  Stanley → Big Rivers Coal → Sand Plant #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

- **operator_operates_mine:** Mullins Sand & Coal → Sand Plant #1; 1980-06-01 to 1991-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Mullins Clovis → Sand Plant #1; 1980-06-01 to 1991-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Mullins Clovis → Mullins Sand & Coal; 1980-06-01 to 1991-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Mullins Sand & Coal → Sand Plant #1; 1991-08-01 to 1995-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Moore Willmon B → Sand Plant #1; 1991-08-01 to 1995-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Moore Willmon B → Mullins Sand & Coal; 1991-08-01 to 1995-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Watts Kyle → Sand Plant #1; 1993-08-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tug Valley Dredge → Sand Plant #1; 1995-08-04 to 2000-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Watts Kyle → Tug Valley Dredge; 1995-08-04 to 2000-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Coakley Development Inc → Sand Plant #1; 2000-01-03 to 2001-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Sam  Coakley → Sand Plant #1; 2000-01-03 to 2001-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Sam  Coakley → Coakley Development Inc; 2000-01-03 to 2001-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Big Rivers Coal → Sand Plant #1; 2001-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Russell  Stanley → Sand Plant #1; 2001-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Russell  Stanley → Big Rivers Coal; 2001-07-16 to current/open; source msha-controller-operator-history