# Relationship history for MSHA mine 1101578

Current hierarchy: **Iron Oak Energy Solutions LLC → Wedron Silica LLC → Wedron 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:** Martin Marietta Materials Inc → Wedron Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wedron Silica Division → Wedron Plant; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Sherman County - KS → Wedron Plant; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Sherman County - KS → Wedron Silica Division; 1950-01-01 to 1979-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Wedron Silica Company → Wedron Plant; 1979-05-01 to 1979-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Twentieth Century Fox → Wedron Plant; 1979-05-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Twentieth Century Fox → Wedron Silica Company; 1979-05-01 to 1979-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Aggregates → Wedron Plant; 1979-09-12 to 1984-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Aggregates; 1979-09-12 to 1984-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Wedron Silica LLC → Wedron Plant; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fairmount Santrol → Wedron Plant; 1984-08-01 to 2018-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Fairmount Santrol → Wedron Silica LLC; 1984-08-01 to 2018-05-31; source msha-controller-operator-history
- **controller_controls_mine:** S C R-Sibelco Nv et al → Wedron Plant; 2018-06-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Wedron Silica LLC; 2018-06-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → Wedron Plant; 2021-01-01 to 2024-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Wedron Silica LLC; 2021-01-01 to 2024-06-30; source msha-controller-operator-history
- **controller_controls_mine:** New Covia Energy LLC → Wedron Plant; 2024-07-01 to 2024-07-12; source msha-controller-operator-history
- **controller_controls_operator:** New Covia Energy LLC → Wedron Silica LLC; 2024-07-01 to 2024-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Iron Oak Energy Solutions LLC → Wedron Plant; 2024-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Iron Oak Energy Solutions LLC → Wedron Silica LLC; 2024-07-13 to current/open; source msha-controller-operator-history