# Relationship history for MSHA mine 0501013

Current hierarchy: **Summit Materials LLC → Peak Materials → Snowstorm Portable Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Ramsour Brothers Inc → Snowstorm Portable Plant; 1950-01-01 to 1984-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Glen R  Ramsour → Snowstorm Portable Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Glen R  Ramsour → Ramsour Brothers Inc; 1950-01-01 to 1984-01-03; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Elam → Snowstorm Portable Plant; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Aggregates Inc → Snowstorm Portable Plant; 1984-01-04 to 2003-10-05; source msha-controller-operator-history
- **controller_controls_mine:** LeRoy  Marquez et al → Snowstorm Portable Plant; 1984-01-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** LeRoy  Marquez et al → Mountain Aggregates Inc; 1984-01-04 to 2003-10-05; source msha-controller-operator-history
- **controller_controls_operator:** Linda L Marquez et al → Mountain Aggregates Inc; 1984-01-04 to 2003-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Everist → Snowstorm Portable Plant; 2002-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Everist Materials, LLC → Snowstorm Portable Plant; 2003-10-06 to 2017-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Everist → Everist Materials, LLC; 2003-10-06 to 2017-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Snowstorm Portable Plant; 2011-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peak Materials → Snowstorm Portable Plant; 2017-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Peak Materials; 2017-04-01 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Peak Materials; 2017-04-01 to current/open; source msha-controller-operator-history