# Relationship history for MSHA mine 3608810

Current hierarchy: **John M  Stilley → AMERIKOHL AGGREGATES → JIM MOUNTAIN QUARRY**

- 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:** John M  Stilley → JIM MOUNTAIN QUARRY; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → JIM MOUNTAIN QUARRY; 1996-03-09 to 2003-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Amerikohl Mining Inc → JIM MOUNTAIN QUARRY; 1998-12-01 to 2001-04-15; source msha-controller-operator-history
- **controller_controls_operator:** John M  Stilley → Amerikohl Mining Inc; 1998-12-01 to 2001-04-15; source msha-controller-operator-history
- **operator_operates_mine:** Better Materials Corp → JIM MOUNTAIN QUARRY; 2001-04-16 to 2004-03-15; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → Better Materials Corp; 2001-04-16 to 2003-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → JIM MOUNTAIN QUARRY; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Better Materials Corp; 2003-07-19 to 2004-03-15; source msha-controller-operator-history
- **operator_operates_mine:** Amerikohl Mining Inc → JIM MOUNTAIN QUARRY; 2004-03-16 to 2012-01-25; source msha-controller-operator-history
- **controller_controls_operator:** John M  Stilley → Amerikohl Mining Inc; 2004-03-16 to 2012-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → JIM MOUNTAIN QUARRY; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Better Materials Corp; 2007-08-23 to 2004-03-15; source msha-controller-operator-history
- **controller_controls_mine:** John M  Stilley → JIM MOUNTAIN QUARRY; 2011-07-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Amerikohl Aggregates → JIM MOUNTAIN QUARRY; 2012-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John M  Stilley → Amerikohl Aggregates; 2012-01-26 to current/open; source msha-controller-operator-history