# Relationship history for MSHA mine 4105004

Current hierarchy: **USS Holdings Inc → U.S. Silica Company → Seagraves, TX**

- 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:** USS Holdings Inc → Seagraves, TX; 1996-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fred Weber Inc et al → Seagraves, TX; 2008-06-03 to 2012-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Synergy Materials Inc et al → Seagraves, TX; 2012-04-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mississippi Sand, LLC → Seagraves, TX; 2013-02-22 to 2017-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Fred Weber Inc et al → Mississippi Sand, LLC; 2013-02-22 to 2012-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Coal Creek Energy LLC et al → Mississippi Sand, LLC; 2013-02-22 to 2012-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Synergy Materials Inc et al → Mississippi Sand, LLC; 2013-02-22 to 2017-10-11; source msha-controller-operator-history
- **controller_controls_operator:** Cemtech International Inc et al → Mississippi Sand, LLC; 2013-02-22 to 2017-10-11; source msha-controller-operator-history
- **operator_operates_mine:** U.S. Silica Company → Seagraves, TX; 2017-10-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → U.S. Silica Company; 2017-10-12 to current/open; source msha-controller-operator-history