# Relationship history for MSHA mine 0404487

Current hierarchy: **Fossil Minerals & Placer Mines Inc → Placer Mines Ltd → Placer Mines Ltd**

- 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:** Base Line Minerals → Placer Mines Ltd; 1980-12-01 to 1982-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Snyder John & Frank J → Placer Mines Ltd; 1980-12-01 to 1982-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Snyder John & Frank J → Base Line Minerals; 1980-12-01 to 1982-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Placer Mines Ltd → Placer Mines Ltd; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fossil Minerals & Placer Mines Inc Et Al → Placer Mines Ltd; 1982-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fossil Minerals & Placer Mines Inc Et Al → Placer Mines Ltd; 1982-03-01 to current/open; source msha-controller-operator-history