# Relationship history for MSHA mine 3102163

Current hierarchy: **James K  Stark; William  Mast → Riverfront Company, LLC → Navassa Sand**

- 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:** Navassa Sand → Navassa Sand; 2000-11-01 to 2003-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Harrelson et al → Navassa Sand; 2000-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Harrelson et al → Navassa Sand; 2000-11-01 to 2003-04-30; source msha-controller-operator-history
- **controller_controls_operator:** B Rex  Stephens et al → Navassa Sand; 2000-11-01 to 2003-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Riverfront Company, LLC → Navassa Sand; 2003-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William  Mast Et Al → Navassa Sand; 2003-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Mast Et Al → Riverfront Company, LLC; 2003-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James K  Stark Et Al → Riverfront Company, LLC; 2003-05-01 to current/open; source msha-controller-operator-history