# Relationship history for MSHA mine 4703599

Current hierarchy: **Scott  Melbourn; Shawn  Furlong → Source Energy Services Proppants, LP → Blair East**

- 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:** Winn Bay Sand LP → Blair East; 2010-12-08 to 2011-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Derksen et al → Blair East; 2010-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Derksen et al → Winn Bay Sand LP; 2010-12-08 to 2011-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Ochapowacc First Nation et al → Winn Bay Sand LP; 2010-12-08 to 2011-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Preferred Sands of Wisconsin LLC → Blair East; 2011-12-15 to 2015-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Mike  O'Neill et al → Blair East; 2011-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  O'Neill et al → Preferred Sands of Wisconsin LLC; 2011-12-15 to 2015-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Brad  Thompson et al → Blair East; 2013-10-16 to 2021-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Preferred Proppants LLC. → Blair East; 2015-07-14 to 2017-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Preferred Intermediate Holding Company, LLC → Blair East; 2015-07-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Preferred Intermediate Holding Company, LLC → Preferred Proppants LLC.; 2015-07-14 to 2017-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Source Energy Services Proppants, LP → Blair East; 2017-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Thompson et al → Source Energy Services Proppants, LP; 2017-11-07 to 2021-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Jim  McMahon et al → Source Energy Services Proppants, LP; 2017-11-07 to 2021-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Brad  Thompson → Blair East; 2021-05-01 to 2022-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Brad  Thompson → Source Energy Services Proppants, LP; 2021-05-01 to 2022-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Melbourn → Blair East; 2022-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Melbourn → Source Energy Services Proppants, LP; 2022-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shawn  Furlong → Source Energy Services Proppants, LP; 2022-10-01 to current/open; source msha-controller-operator-history