# Relationship history for MSHA mine 4002968

Current hierarchy: **USS Holdings Inc → U.S. Silica Company, LLC → Middleton Operations**

- 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:** W M  Gurley → Middleton Operations; 1986-02-01 to 1994-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Moltan Company → Middleton Operations; 1988-01-01 to 1991-10-29; source msha-controller-operator-history
- **controller_controls_operator:** W M  Gurley → Moltan Company; 1988-01-01 to 1991-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Moltan Company L P → Middleton Operations; 1991-10-30 to 2013-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Cheryl  Followell et al → Middleton Operations; 1991-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cheryl  Followell et al → Moltan Company L P; 1991-10-30 to 2013-04-03; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → Middleton Operations; 1996-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Eagle-Picher Industries Inc → Middleton Operations; 2006-08-01 to 2010-02-14; source msha-controller-operator-history
- **controller_controls_mine:** EP Management Corporation → Middleton Operations; 2010-02-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** EP Minerals LLC → Middleton Operations; 2013-04-04 to 2019-05-13; source msha-controller-operator-history
- **controller_controls_operator:** EP Management Corporation → EP Minerals LLC; 2013-04-04 to 2019-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Eagle-Picher Industries Inc → EP Minerals LLC; 2013-04-04 to 2010-02-14; source msha-controller-operator-history
- **operator_operates_mine:** U.S. Silica Company, LLC → Middleton Operations; 2019-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → U.S. Silica Company, LLC; 2019-05-14 to current/open; source msha-controller-operator-history