# Relationship history for MSHA mine 3608336

Current hierarchy: **Cyprus Amax Minerals Company → Cyprus River Processing Corp → Monongahela Resource Mine**

- 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:** Hayhurst James W Ii → Monongahela Resource Mine; 1987-08-05 to 1995-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Dynamic Recovery Inc → Monongahela Resource Mine; 1992-04-01 to 1995-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Hayhurst James W Ii → Dynamic Recovery Inc; 1992-04-01 to 1995-04-08; source msha-controller-operator-history
- **operator_operates_mine:** Riverside Mining Company → Monongahela Resource Mine; 1995-04-09 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Steve  Havrilesko → Monongahela Resource Mine; 1995-04-09 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Havrilesko → Riverside Mining Company; 1995-04-09 to 1995-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus River Processing Corp → Monongahela Resource Mine; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Monongahela Resource Mine; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus River Processing Corp; 1996-01-01 to current/open; source msha-controller-operator-history