# Relationship history for MSHA mine 1519268

Current hierarchy: **Michael  Blubaugh → Double Mountain Mining LLC → Mine #3**

- 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:** Strata Mining, Inc → Mine #3; 2008-07-15 to 2016-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Ronald D  Robinson et al → Mine #3; 2008-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ronald D  Robinson et al → Strata Mining, Inc; 2008-07-15 to 2016-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Phillip E  Waller et al → Strata Mining, Inc; 2008-07-15 to 2016-09-12; source msha-controller-operator-history
- **controller_controls_mine:** JW Resources Holdings Inc → Mine #3; 2014-03-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Middlesboro Mining Operations, Inc → Mine #3; 2016-09-13 to 2016-12-27; source msha-controller-operator-history
- **controller_controls_operator:** JW Resources Holdings Inc → Middlesboro Mining Operations, Inc; 2016-09-13 to 2016-12-27; source msha-controller-operator-history
- **operator_operates_mine:** Double Mountain Mining LLC → Mine #3; 2016-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Douglas  Warriner → Mine #3; 2016-12-28 to 2018-08-15; source msha-controller-operator-history
- **controller_controls_operator:** Douglas  Warriner → Double Mountain Mining LLC; 2016-12-28 to 2018-08-15; source msha-controller-operator-history
- **controller_controls_mine:** Michael A  Blubaugh et al → Mine #3; 2018-08-16 to 2020-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Michael A  Blubaugh et al → Double Mountain Mining LLC; 2018-08-16 to 2020-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Douglas S  Warriner et al → Double Mountain Mining LLC; 2018-08-16 to 2020-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Blubaugh → Mine #3; 2020-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Blubaugh → Double Mountain Mining LLC; 2020-07-28 to current/open; source msha-controller-operator-history