# Relationship history for MSHA mine 4801012

Current hierarchy: **Steve  Robson; Randall D  Peterson → New Stansbury Coal Company LLC → Stansbury Mine**

- 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

- **controller_controls_mine:** Ashland Inc et al → Stansbury Mine; 1950-01-01 to 2006-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Winton Coal Company → Stansbury Mine; 1974-01-01 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Ideal Basic Industries Inc & Union Pacific Corp → Stansbury Mine; 1974-01-01 to 1987-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Ideal Basic Industries Inc & Union Pacific Corp → Winton Coal Company; 1974-01-01 to 1987-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Bitter Creek Resources Inc → Stansbury Mine; 1987-09-01 to 1989-07-13; source msha-controller-operator-history
- **controller_controls_mine:** Nearburg Eugene E → Stansbury Mine; 1987-09-01 to 1989-07-13; source msha-controller-operator-history
- **controller_controls_operator:** Nearburg Eugene E → Bitter Creek Resources Inc; 1987-09-01 to 1989-07-13; source msha-controller-operator-history
- **operator_operates_mine:** Arch Of Wyoming Llc → Stansbury Mine; 1989-07-14 to 1996-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Arch Of Wyoming Llc; 1989-07-14 to 1996-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Rock Springs Royalty Company → Stansbury Mine; 1996-04-12 to 2005-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Union Pacific Corp Et Al → Stansbury Mine; 1996-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Union Pacific Corp Et Al → Rock Springs Royalty Company; 1996-04-12 to 2005-08-31; source msha-controller-operator-history
- **operator_operates_mine:** New Stansbury Coal Company LLC → Stansbury Mine; 2005-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Randall D  Peterson et al → Stansbury Mine; 2005-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Randall D  Peterson et al → New Stansbury Coal Company LLC; 2005-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Robson et al → New Stansbury Coal Company LLC; 2005-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Stansbury Mine; 2006-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Arch Of Wyoming Llc; 2006-04-05 to 1996-04-11; source msha-controller-operator-history