# Relationship history for MSHA mine 4105637

Current hierarchy: **High Roller Ventures LLC; Industrial Minerals of CT LLC → HRS HoldCo LLC → Winkler 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Stephen  Greak et al → Winkler Plant; 2018-11-05 to 2025-03-31; source msha-controller-operator-history
- **operator_operates_mine:** High Roller Sand → Winkler Plant; 2022-07-26 to 2026-03-16; source msha-controller-operator-history
- **controller_controls_operator:** Stephen  Greak et al → High Roller Sand; 2022-07-26 to 2025-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Dustin  Bailey et al → High Roller Sand; 2022-07-26 to 2025-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Iron Oak Energy Solutions LLC → Winkler Plant; 2025-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Iron Oak Energy Solutions LLC → High Roller Sand; 2025-04-01 to 2026-03-16; source msha-controller-operator-history
- **operator_operates_mine:** HRS HoldCo LLC → Winkler Plant; 2026-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Industrial Minerals of CT LLC et al → Winkler Plant; 2026-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Industrial Minerals of CT LLC et al → HRS HoldCo LLC; 2026-03-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** High Roller Ventures LLC et al → HRS HoldCo LLC; 2026-03-17 to current/open; source msha-controller-operator-history