# Relationship history for MSHA mine 2401648

Current hierarchy: **Timothy  Antonioli → Contact Mining Company → Contact Concentrator**

- 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

- **controller_controls_mine:** Timothy  Antonioli et al → Contact Concentrator; 1980-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Contact Mining Company → Contact Concentrator; 1981-08-01 to 2010-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Antonioli et al → Contact Mining Company; 1981-08-01 to 2010-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Drumlummon Gold Corp → Contact Concentrator; 2010-09-17 to 2013-06-11; source msha-controller-operator-history
- **controller_controls_mine:** RX Gold and Silver Inc. → Contact Concentrator; 2010-09-17 to 2012-10-01; source msha-controller-operator-history
- **controller_controls_operator:** RX Gold and Silver Inc. → Drumlummon Gold Corp; 2010-09-17 to 2012-10-01; source msha-controller-operator-history
- **controller_controls_mine:** U S Silver & Gold Inc → Contact Concentrator; 2012-10-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Silver & Gold Inc → Drumlummon Gold Corp; 2012-10-02 to 2013-06-11; source msha-controller-operator-history
- **operator_operates_mine:** Contact Mining Company → Contact Concentrator; 2013-06-12 to 2013-09-29; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Antonioli et al → Contact Mining Company; 2013-06-12 to 2013-09-29; source msha-controller-operator-history
- **operator_operates_mine:** Strategic Minerals → Contact Concentrator; 2013-09-30 to 2014-07-03; source msha-controller-operator-history
- **controller_controls_mine:** Sima  Muroff et al → Contact Concentrator; 2013-09-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sima  Muroff et al → Strategic Minerals; 2013-09-30 to 2014-07-03; source msha-controller-operator-history
- **operator_operates_mine:** Contact Mining Company → Contact Concentrator; 2014-07-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Timothy  Antonioli et al → Contact Mining Company; 2014-07-04 to current/open; source msha-controller-operator-history