# Relationship history for MSHA mine 3503502

Current hierarchy: **Eugene R  Cloud → Blue Mountain Rock Inc. → NORTH SLOPE**

- 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:** J & B Rock → NORTH SLOPE; 2000-06-01 to 2008-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Jerry  Bertagnolli → NORTH SLOPE; 2000-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Bertagnolli → J & B Rock; 2000-06-01 to 2008-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Frontier Rock LLC → NORTH SLOPE; 2008-06-01 to 2011-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Sue M  Pennington et al → NORTH SLOPE; 2008-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sue M  Pennington et al → Frontier Rock LLC; 2008-06-01 to 2011-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Blue Mountain Rock Inc. → NORTH SLOPE; 2011-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eugene R  Cloud → NORTH SLOPE; 2011-03-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eugene R  Cloud → Blue Mountain Rock Inc.; 2011-03-18 to current/open; source msha-controller-operator-history