# Relationship history for MSHA mine 0504987

Current hierarchy: **Arthur D  Gibson; David A  Wilds → High Mountain Mining Company LLC → Alma Placer**

- 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:** Alma Placer Company LLC → Alma Placer; 2011-07-11 to 2011-11-23; source msha-controller-operator-history
- **controller_controls_mine:** Craig  Camozzi et al → Alma Placer; 2011-07-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig  Camozzi et al → Alma Placer Company LLC; 2011-07-11 to 2011-11-23; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Albritton et al → Alma Placer Company LLC; 2011-07-11 to 2011-11-23; source msha-controller-operator-history
- **controller_controls_operator:** J Timothy  Brittan et al → Alma Placer Company LLC; 2011-07-11 to 2011-11-23; source msha-controller-operator-history
- **operator_operates_mine:** High Mountain Mining Company LLC → Alma Placer; 2011-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arthur D  Gibson et al → Alma Placer; 2011-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arthur D  Gibson et al → High Mountain Mining Company LLC; 2011-11-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David A  Wilds et al → High Mountain Mining Company LLC; 2011-11-24 to current/open; source msha-controller-operator-history