# Relationship history for MSHA mine 0503800

Current hierarchy: **Summit Materials LLC → Peak Mtls → Maryland Creek**

- 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:** L G Everist Inc → Maryland Creek; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Elam → Maryland Creek; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **operator_operates_mine:** L G Everist Inc → Maryland Creek; 1982-08-01 to 2002-03-31; source msha-controller-operator-history
- **controller_controls_operator:** L G Everist Inc → L G Everist Inc; 1982-08-01 to 2002-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Everist Materials LLC → Maryland Creek; 2002-04-01 to 2017-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Everist → Maryland Creek; 2002-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Everist → Everist Materials LLC; 2002-04-01 to 2017-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Maryland Creek; 2011-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peak Mtls → Maryland Creek; 2017-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Peak Mtls; 2017-04-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Peak Mtls; 2017-04-01 to current/open; source msha-controller-operator-history