# Relationship history for MSHA mine 4403316

Current hierarchy: **Fields Resources Inc → Black Diamond Fuel Company → Surface Mine No 1**

- 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:** Fields Resources Inc → Surface Mine No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Margaret Ann Coal Company → Surface Mine No 1; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Margaret Ann Coal Company → Surface Mine No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margaret Ann Coal Company → Margaret Ann Coal Company; 1950-01-01 to 1972-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Black Diamond Fuel Company → Surface Mine No 1; 1973-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fields Resources Inc → Black Diamond Fuel Company; 1973-01-01 to current/open; source msha-controller-operator-history