# Relationship history for MSHA mine 4002964

Current hierarchy: **J Eric  Tillirson → Short Mountain Silica Company → Little Six Corp. dba Short Mtn Silica**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Short Mountain Silica Company → Little Six Corp. dba Short Mtn Silica; 1987-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** J D  Nicewonder → Little Six Corp. dba Short Mtn Silica; 1987-11-01 to 2017-04-06; source msha-controller-operator-history
- **controller_controls_operator:** J D  Nicewonder → Short Mountain Silica Company; 1987-11-01 to 2017-04-06; source msha-controller-operator-history
- **controller_controls_mine:** J Eric  Tillirson et al → Little Six Corp. dba Short Mtn Silica; 2017-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Eric  Tillirson et al → Short Mountain Silica Company; 2017-04-07 to current/open; source msha-controller-operator-history