# Relationship history for MSHA mine 4201172

Current hierarchy: **Lawrence Jack A → New-Tech Mining Corp → Black Jack #1 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

- **operator_operates_mine:** Wes Pac Energy → Black Jack #1 Mine; 1975-01-01 to 1980-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Western America Energy Corp & Coal-Pac → Black Jack #1 Mine; 1975-01-01 to 1980-03-20; source msha-controller-operator-history
- **controller_controls_operator:** Western America Energy Corp & Coal-Pac → Wes Pac Energy; 1975-01-01 to 1980-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Eagle Mining & Exploration Inc → Black Jack #1 Mine; 1980-03-21 to 1983-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Anderson Richard → Black Jack #1 Mine; 1980-03-21 to 1983-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Anderson Richard → Eagle Mining & Exploration Inc; 1980-03-21 to 1983-03-31; source msha-controller-operator-history
- **operator_operates_mine:** New-Tech Mining Corp → Black Jack #1 Mine; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lawrence Jack A → Black Jack #1 Mine; 1983-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lawrence Jack A → New-Tech Mining Corp; 1983-04-01 to current/open; source msha-controller-operator-history