# Relationship history for MSHA mine 0405131

Current hierarchy: **Donald  Mallory; Steven R Mallory → Silica Resources Inc → S.R.I. MARYSVILLE**

- 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:** Silica Resources Inc → S.R.I. MARYSVILLE; 1991-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jack L  Greenhalgh → S.R.I. MARYSVILLE; 1991-01-01 to 2014-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Jack L  Greenhalgh → Silica Resources Inc; 1991-01-01 to 2014-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Marlys E  Greenhalgh et al → S.R.I. MARYSVILLE; 2014-08-01 to 2021-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Marlys E  Greenhalgh et al → Silica Resources Inc; 2014-08-01 to 2021-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Edward  Mallory et al → Silica Resources Inc; 2014-08-01 to 2021-12-27; source msha-controller-operator-history
- **controller_controls_mine:** Steven R Mallory et al → S.R.I. MARYSVILLE; 2021-12-28 to 2022-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Steven R Mallory et al → Silica Resources Inc; 2021-12-28 to 2022-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Marlys Greenhalgh et al → Silica Resources Inc; 2021-12-28 to 2022-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Mallory et al → S.R.I. MARYSVILLE; 2022-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Mallory et al → Silica Resources Inc; 2022-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steven R Mallory et al → Silica Resources Inc; 2022-09-12 to current/open; source msha-controller-operator-history