# Relationship history for MSHA mine 0404856

Current hierarchy: **Darren  Morehead → Butte Sand & Gravel → Butte Ranch Pit**

- 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:** Darren  Morehead → Butte Ranch Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sutter Sand & Gravel Inc → Butte Ranch Pit; 1986-12-01 to 2001-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Sutter Sand & Gravel Inc → Butte Ranch Pit; 1986-12-01 to 2001-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Sutter Sand & Gravel Inc → Sutter Sand & Gravel Inc; 1986-12-01 to 2001-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Butte Sand & Gravel → Butte Ranch Pit; 2001-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darren  Morehead → Butte Sand & Gravel; 2001-02-28 to current/open; source msha-controller-operator-history