# Relationship history for MSHA mine 4200400

Current hierarchy: **Summit Materials LLC → Kilgore Contracting → Little Mountain**

- 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:** Salt Lake Valley Sand & Gravel Company → Little Mountain; 1950-01-01 to 1993-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Dan R  Fogle → Little Mountain; 1950-01-01 to 1993-05-27; source msha-controller-operator-history
- **controller_controls_operator:** Dan R  Fogle → Salt Lake Valley Sand & Gravel Company; 1950-01-01 to 1993-05-27; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Elam → Little Mountain; 1950-01-01 to 2011-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Salt Lake Valley Sand & Gravel → Little Mountain; 1993-05-28 to 2011-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Dave  Balls et al → Little Mountain; 1993-05-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dave  Balls et al → Salt Lake Valley Sand & Gravel; 1993-05-28 to 2011-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Baker et  al → Salt Lake Valley Sand & Gravel; 1993-05-28 to 2011-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Little Mountain; 2011-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kilgore Contracting → Little Mountain; 2011-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Elam → Kilgore Contracting; 2011-06-09 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Kilgore Contracting; 2011-06-09 to current/open; source msha-controller-operator-history