# Relationship history for MSHA mine 2300210

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Iron Mountain Quarry**

- 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:** Martin Marietta Materials Inc → Iron Mountain Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Iron Mountain Trap Rock Company → Iron Mountain Quarry; 1950-01-01 to 1997-10-31; source msha-controller-operator-history
- **controller_controls_mine:** John R  Malloy → Iron Mountain Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John R  Malloy → Iron Mountain Trap Rock Company; 1950-01-01 to 1997-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Iron Mountain Trap Rock Company → Iron Mountain Quarry; 1997-11-01 to 2021-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Fred Weber, Inc. → Iron Mountain Quarry; 1997-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fred Weber, Inc. → Iron Mountain Trap Rock Company; 1997-11-01 to 2021-06-30; source msha-controller-operator-history
- **operator_operates_mine:** New Frontier Materials Operations Beta, LLC → Iron Mountain Quarry; 2021-07-01 to 2026-06-14; source msha-controller-operator-history
- **controller_controls_mine:** PEPI Capital, L.P. et al → Iron Mountain Quarry; 2021-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** PEPI Capital, L.P. et al → New Frontier Materials Operations Beta, LLC; 2021-07-01 to 2026-06-14; source msha-controller-operator-history
- **controller_controls_operator:** RWNIH-OP Holdings LLC et al → New Frontier Materials Operations Beta, LLC; 2021-07-01 to 2026-06-14; source msha-controller-operator-history
- **controller_controls_operator:** 42 North Resources Partners II LP et al → New Frontier Materials Operations Beta, LLC; 2021-07-01 to 2026-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Iron Mountain Quarry; 2026-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2026-06-15 to current/open; source msha-controller-operator-history