# Relationship history for MSHA mine 4103939

Current hierarchy: **Bobby  Yancey → San Jacinto River Materials, Inc. → San Jacinto River Materials, Inc.**

- 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:** Genoa Mining Inc → San Jacinto River Materials, Inc.; 1997-01-01 to 2001-02-09; source msha-controller-operator-history
- **controller_controls_mine:** James B  Pace Jr → San Jacinto River Materials, Inc.; 1998-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James B  Pace Jr → Genoa Mining Inc; 1998-01-01 to 2001-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Conroe Sand & Clay Ltd → San Jacinto River Materials, Inc.; 2001-02-10 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_mine:** John  Merdian  et al → San Jacinto River Materials, Inc.; 2001-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Merdian  et al → Conroe Sand & Clay Ltd; 2001-02-10 to 2006-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Traci  Merdian  et al → Conroe Sand & Clay Ltd; 2001-02-10 to 2006-07-31; source msha-controller-operator-history
- **operator_operates_mine:** San Jacinto River Materials Inc → San Jacinto River Materials, Inc.; 2006-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bobby  Yancey → San Jacinto River Materials, Inc.; 2006-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bobby  Yancey → San Jacinto River Materials Inc; 2006-08-01 to current/open; source msha-controller-operator-history