# Relationship history for MSHA mine 4608906

Current hierarchy: **Jeffery A  Hoops → Revelation Energy, LLC → S11 Keystone Surface Mine**

- 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:** Keystone Development → S11 Keystone Surface Mine; 2001-06-01 to 2012-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Scholl → S11 Keystone Surface Mine; 2001-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Scholl → Keystone Development; 2001-06-01 to 2012-12-11; source msha-controller-operator-history
- **controller_controls_mine:** Jeffery A  Hoops → S11 Keystone Surface Mine; 2009-05-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Revelation Energy, LLC → S11 Keystone Surface Mine; 2012-12-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery A  Hoops → Revelation Energy, LLC; 2012-12-12 to current/open; source msha-controller-operator-history