# Relationship history for MSHA mine 3100117

Current hierarchy: **Imerys S A; Norsk Mineral AS → The Quartz Corp USA → Wiseman Sullins/Chalk**

- 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:** The Feldspar Corporation → Wiseman Sullins/Chalk; 1950-01-01 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Zemex Corp → Wiseman Sullins/Chalk; 1950-01-01 to 2003-03-02; source msha-controller-operator-history
- **controller_controls_operator:** Zemex Corp → The Feldspar Corporation; 1950-01-01 to 2003-03-02; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Wiseman Sullins/Chalk; 2001-03-28 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Cementos Pacasmayo SSA → Wiseman Sullins/Chalk; 2003-03-03 to 2007-09-04; source msha-controller-operator-history
- **controller_controls_operator:** Cementos Pacasmayo SSA → The Feldspar Corporation; 2003-03-03 to 2007-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Wiseman Sullins/Chalk; 2007-09-05 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → The Feldspar Corporation; 2007-09-05 to 2011-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A  et al → Wiseman Sullins/Chalk; 2011-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A  et al → The Feldspar Corporation; 2011-04-01 to 2012-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Norsk Mineral AS  et al → The Feldspar Corporation; 2011-04-01 to 2012-12-31; source msha-controller-operator-history
- **operator_operates_mine:** The Quartz Corp USA → Wiseman Sullins/Chalk; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A  et al → The Quartz Corp USA; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norsk Mineral AS  et al → The Quartz Corp USA; 2013-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → The Quartz Corp USA; 2013-01-01 to 2011-03-31; source msha-controller-operator-history