# Relationship history for MSHA mine 1001521

Current hierarchy: **Peck Gary & John Mc Daniel → Gary Peck → Monarca 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:** Earl Nichols  Waite → Monarca Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Schwarzhoff Dale → Monarca Mine; 1980-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mc Dermett & Sons → Monarca Mine; 1980-11-01 to 1981-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Mc Dermett & Sons → Monarca Mine; 1980-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Dermett & Sons → Mc Dermett & Sons; 1980-11-01 to 1981-05-06; source msha-controller-operator-history
- **operator_operates_mine:** Earl Waite & Sons → Monarca Mine; 1981-05-07 to 1981-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Earl Nichols  Waite → Earl Waite & Sons; 1981-05-07 to 1981-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Key Milling Company → Monarca Mine; 1981-09-22 to 1982-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Schwarzhoff Dale → Key Milling Company; 1981-09-22 to 1982-05-17; source msha-controller-operator-history
- **operator_operates_mine:** Keyrok Joint Venture → Monarca Mine; 1982-05-18 to 1988-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Keyrok Joint Venture → Monarca Mine; 1982-05-18 to 1988-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Keyrok Joint Venture → Keyrok Joint Venture; 1982-05-18 to 1988-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Gary Peck → Monarca Mine; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Peck Gary & John Mc Daniel → Monarca Mine; 1988-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peck Gary & John Mc Daniel → Gary Peck; 1988-03-01 to current/open; source msha-controller-operator-history