# Relationship history for MSHA mine 0505068

Current hierarchy: **Amrize Ltd → Holcim-WCR, INC → Eight Mile Quarry**

- 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:** Daniel E  Tezak → Eight Mile Quarry; 1993-04-17 to 2023-03-30; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Eight Mile Quarry; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Eight Mile Quarry; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Edward J  Tezak → Eight Mile Quarry; 2010-07-28 to 2013-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Kathleen  Tezak et al → Eight Mile Quarry; 2013-08-06 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Rhonda  Lewis et al → Eight Mile Quarry; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Eight Mile Quarry; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Rocky Mountain Landscape Materials, LLC → Eight Mile Quarry; 2016-10-13 to 2023-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Edward J  Tezak → Rocky Mountain Landscape Materials, LLC; 2016-10-13 to 2013-08-05; source msha-controller-operator-history
- **controller_controls_operator:** Kathleen  Tezak et al → Rocky Mountain Landscape Materials, LLC; 2016-10-13 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Tezak et al → Rocky Mountain Landscape Materials, LLC; 2016-10-13 to 2014-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Rhonda  Lewis et al → Rocky Mountain Landscape Materials, LLC; 2016-10-13 to 2023-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Danny  Tezak et al → Rocky Mountain Landscape Materials, LLC; 2016-10-13 to 2023-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Eight Mile Quarry; 2023-03-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tezak Heavy Equipment, LLC → Eight Mile Quarry; 2023-04-20 to 2023-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Tezak Heavy Equipment, LLC; 2023-04-20 to 2023-08-08; source msha-controller-operator-history
- **controller_controls_operator:** Daniel E  Tezak → Tezak Heavy Equipment, LLC; 2023-04-20 to 2023-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Holcim-WCR, INC → Eight Mile Quarry; 2023-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim-WCR, INC; 2023-08-09 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Holcim-WCR, INC; 2023-08-09 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Holcim-WCR, INC; 2023-08-09 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Eight Mile Quarry; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Holcim-WCR, INC; 2025-06-23 to current/open; source msha-controller-operator-history