# Relationship history for MSHA mine 4503577

Current hierarchy: **Rick  Scarsella; Robert  Scarsella → Discovery Materials, LLC → Discovery Bay Pit**

- 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:** William  Arness → Discovery Bay Pit; 2001-07-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Discovery Bay Materials → Discovery Bay Pit; 2005-03-29 to 2005-07-11; source msha-controller-operator-history
- **controller_controls_mine:** Mike E  Green → Discovery Bay Pit; 2005-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike E  Green → Discovery Bay Materials; 2005-03-29 to 2005-07-11; source msha-controller-operator-history
- **operator_operates_mine:** HARD ROCK, INC. → Discovery Bay Pit; 2005-07-12 to 2022-05-09; source msha-controller-operator-history
- **controller_controls_operator:** William  Arness → HARD ROCK, INC.; 2005-07-12 to 2022-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Discovery Materials, LLC → Discovery Bay Pit; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert  Scarsella et al → Discovery Bay Pit; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert  Scarsella et al → Discovery Materials, LLC; 2022-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Scarsella et al → Discovery Materials, LLC; 2022-05-10 to current/open; source msha-controller-operator-history