# Relationship history for MSHA mine 0200134

Current hierarchy: **Grupo Mexico S A B de C V → ASARCO LLC, a Delaware Limited Liability Company → SILVER BELL MINING LLC**

- 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:** Silver Bell Mining Llc → SILVER BELL MINING LLC; 1950-01-01 to 2000-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Asarco Inc → SILVER BELL MINING LLC; 1950-01-01 to 2000-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → Silver Bell Mining Llc; 1950-01-01 to 2000-02-29; source msha-controller-operator-history
- **controller_controls_mine:** Grupo Mexico S A B de C V → SILVER BELL MINING LLC; 1999-11-17 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** ASARCO LLC, a Delaware Limited Liability Company → SILVER BELL MINING LLC; 2000-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grupo Mexico S A B de C V → ASARCO LLC, a Delaware Limited Liability Company; 2000-03-01 to current/open; source msha-controller-operator-history