# Relationship history for MSHA mine 0203411

Current hierarchy: **Eco Material Technologies Inc → EM Materials, LLC → EM Materials LLC (Kirkland)**

- 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:** Kirkland Mining Company LLC → EM Materials LLC (Kirkland); 2019-03-07 to 2021-03-02; source msha-controller-operator-history
- **controller_controls_mine:** KMC Mining Holdings Inc → EM Materials LLC (Kirkland); 2019-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** KMC Mining Holdings Inc → Kirkland Mining Company LLC; 2019-03-07 to 2021-03-02; source msha-controller-operator-history
- **operator_operates_mine:** Boral Materials, LLC → EM Materials LLC (Kirkland); 2021-03-03 to 2022-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Boral Limited → EM Materials LLC (Kirkland); 2021-03-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Boral Limited → Boral Materials, LLC; 2021-03-03 to 2022-04-07; source msha-controller-operator-history
- **operator_operates_mine:** EM Materials, LLC → EM Materials LLC (Kirkland); 2022-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eco Material Technologies Inc → EM Materials LLC (Kirkland); 2022-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eco Material Technologies Inc → EM Materials, LLC; 2022-04-08 to current/open; source msha-controller-operator-history