# Relationship history for MSHA mine 3100381

Current hierarchy: **Imerys S A → Imerys Mica Kings Mountain → Battleground Mill**

- 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:** United States Gypsum Company → Battleground Mill; 1950-01-01 to 1986-12-16; source msha-controller-operator-history
- **controller_controls_mine:** USG Corporation → Battleground Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** USG Corporation → United States Gypsum Company; 1950-01-01 to 1986-12-16; source msha-controller-operator-history
- **controller_controls_mine:** Matthew A  Ferro Jr → Battleground Mill; 1950-01-01 to 1994-08-03; source msha-controller-operator-history
- **controller_controls_mine:** Franklin Industries Inc → Battleground Mill; 1950-01-01 to 2006-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Kmg Minerals Inc → Battleground Mill; 1986-12-17 to 1994-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Matthew A  Ferro Jr → Kmg Minerals Inc; 1986-12-17 to 1994-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Franklin Industrial Minerals → Battleground Mill; 1994-07-28 to 1999-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Franklin Industries Inc → Franklin Industrial Minerals; 1994-07-28 to 1999-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Oglebay Norton Specialty Mineral → Battleground Mill; 1999-12-01 to 2005-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Oglebay Norton Company → Battleground Mill; 1999-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Oglebay Norton Company → Oglebay Norton Specialty Mineral; 1999-12-01 to 2005-04-14; source msha-controller-operator-history
- **controller_controls_mine:** Zemex Corp → Battleground Mill; 2005-04-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kings Mountain Mining LLC → Battleground Mill; 2005-04-15 to 2007-11-27; source msha-controller-operator-history
- **controller_controls_operator:** Zemex Corp → Kings Mountain Mining LLC; 2005-04-15 to 2007-11-27; source msha-controller-operator-history
- **controller_controls_mine:** Lhoist Group → Battleground Mill; 2006-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lhoist Group → Franklin Industrial Minerals; 2006-12-01 to 1999-11-30; source msha-controller-operator-history
- **controller_controls_mine:** General Chemical Industrial Products Inc → Battleground Mill; 2007-11-07 to 2008-10-09; source msha-controller-operator-history
- **operator_operates_mine:** Imerys Mica Kings Mountain → Battleground Mill; 2007-11-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Chemical Industrial Products Inc → Imerys Mica Kings Mountain; 2007-11-28 to 2008-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Battleground Mill; 2008-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Imerys Mica Kings Mountain; 2008-10-10 to current/open; source msha-controller-operator-history