# Relationship history for MSHA mine 3101308

Current hierarchy: **Martin Marietta Materials Inc → Martin Marietta Materials, Inc. → Wilmington 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

- **controller_controls_mine:** Martin Marietta Materials Inc → Wilmington Sand; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Oakridge Sand Company Inc → Wilmington Sand; 1950-01-01 to 1986-01-13; source msha-controller-operator-history
- **controller_controls_mine:** William L Whitehead → Wilmington Sand; 1950-01-01 to 1986-01-13; source msha-controller-operator-history
- **controller_controls_operator:** William L Whitehead → Oakridge Sand Company Inc; 1950-01-01 to 1986-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Wilmington Materials Inc → Wilmington Sand; 1986-01-14 to 2000-10-15; source msha-controller-operator-history
- **controller_controls_mine:** Kyle H  McIntyre → Wilmington Sand; 1986-01-14 to 2000-10-15; source msha-controller-operator-history
- **controller_controls_operator:** Kyle H  McIntyre → Wilmington Materials Inc; 1986-01-14 to 2000-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Wilmington Materials → Wilmington Sand; 2000-10-16 to 2003-04-30; source msha-controller-operator-history
- **controller_controls_mine:** B Rex  Stephens et al → Wilmington Sand; 2000-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B Rex  Stephens et al → Wilmington Materials; 2000-10-16 to 2003-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Harrelson et al → Wilmington Materials; 2000-10-16 to 2003-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Riverfront Company, LLC → Wilmington Sand; 2003-05-01 to 2016-09-18; source msha-controller-operator-history
- **controller_controls_mine:** William  Mast Et Al → Wilmington 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 2016-09-18; source msha-controller-operator-history
- **controller_controls_operator:** James K  Stark Et Al → Riverfront Company, LLC; 2003-05-01 to 2016-09-18; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → Wilmington Sand; 2016-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2016-09-19 to current/open; source msha-controller-operator-history