# Relationship history for MSHA mine 0504527

Current hierarchy: **Southern Ute Indian Tribe → Sky Ute Sand & Gravel, LLC → High Country Aggregates II**

- 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:** Judy  DeVincentis et al → High Country Aggregates II; 1988-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** High Country Aggregates Inc → High Country Aggregates II; 1993-07-01 to 1999-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Judy  DeVincentis et al → High Country Aggregates Inc; 1993-07-01 to 1999-03-31; source msha-controller-operator-history
- **operator_operates_mine:** High Country Aggregates → High Country Aggregates II; 1999-04-01 to 2005-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Mark S  Haldorson → High Country Aggregates II; 1999-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark S  Haldorson → High Country Aggregates; 1999-04-01 to 2005-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Southern Ute Indian Tribe → High Country Aggregates II; 2004-01-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sky Ute Sand & Gravel, LLC → High Country Aggregates II; 2005-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Southern Ute Indian Tribe → Sky Ute Sand & Gravel, LLC; 2005-06-29 to current/open; source msha-controller-operator-history