# Relationship history for MSHA mine 4300011

Current hierarchy: **John M  Williams → NEWMONT SLATE COMPANY INC → NEWMONT SLATE CO., INC.**

- 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:** Green Mountain Slate Inc → NEWMONT SLATE CO., INC.; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_mine:** William J  Billow → NEWMONT SLATE CO., INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William J  Billow → Green Mountain Slate Inc; 1950-01-01 to 1978-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Ronald A  Roberts → NEWMONT SLATE CO., INC.; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Roberts Slate Company Inc → NEWMONT SLATE CO., INC.; 1978-06-01 to 1979-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Ronald A  Roberts → Roberts Slate Company Inc; 1978-06-01 to 1979-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Granville Slate Company → NEWMONT SLATE CO., INC.; 1979-03-21 to 1995-02-14; source msha-controller-operator-history
- **controller_controls_mine:** John M  Williams → NEWMONT SLATE CO., INC.; 1979-03-21 to 1995-02-14; source msha-controller-operator-history
- **controller_controls_operator:** John M  Williams → Granville Slate Company; 1979-03-21 to 1995-02-14; source msha-controller-operator-history
- **controller_controls_mine:** John M  Williams → NEWMONT SLATE CO., INC.; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Newmont Slate Company Inc → NEWMONT SLATE CO., INC.; 1995-02-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Williams → Newmont Slate Company Inc; 1995-02-15 to current/open; source msha-controller-operator-history