# Relationship history for MSHA mine 2602089

Current hierarchy: **Lance K  Semenko; Mike P  Dianda; Chris A  Dianda → Q&D Construction LLC → Mustang 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:** Garth  Frehner → Mustang Quarry; 1983-08-01 to 2004-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Frehner Construction Company Inc → Mustang Quarry; 1987-08-01 to 2006-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Garth  Frehner → Frehner Construction Company Inc; 1987-08-01 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Mustang Quarry; 2004-05-10 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Frehner Construction Company Inc; 2004-05-10 to 2006-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Sierra Nevada Construction Inc. → Mustang Quarry; 2006-09-27 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Craig D  Holt et al → Mustang Quarry; 2006-09-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig D  Holt et al → Sierra Nevada Construction Inc.; 2006-09-27 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Kevin L  Robertson et al → Sierra Nevada Construction Inc.; 2006-09-27 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Mustang Quarry; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Frehner Construction Company Inc; 2009-04-30 to 2006-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Mustang Quarry; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Frehner Construction Company Inc; 2015-07-10 to 2006-09-27; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Dianda et al → Mustang Quarry; 2017-03-16 to 2021-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Q&D Construction LLC → Mustang Quarry; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Dianda et al → Q&D Construction LLC; 2019-01-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Christopher  Dianda et al → Q&D Construction LLC; 2019-01-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Mike P  Dianda et al → Mustang Quarry; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike P  Dianda et al → Q&D Construction LLC; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lance K  Semenko et al → Q&D Construction LLC; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chris A  Dianda et al → Q&D Construction LLC; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Mustang Quarry; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Frehner Construction Company Inc; 2025-06-23 to 2006-09-27; source msha-controller-operator-history