# Relationship history for MSHA mine 0503783

Current hierarchy: **Luzar Lawrence E → L E L Construction → Sloan Diamond Project**

- 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:** Superior Oil Company → Sloan Diamond Project; 1979-11-01 to 1984-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Superior Oil Company → Sloan Diamond Project; 1982-07-01 to 1984-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Superior Oil Company → Superior Oil Company; 1982-07-01 to 1984-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Superior Oil Company → Sloan Diamond Project; 1984-09-28 to 1985-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Mobil Corp → Sloan Diamond Project; 1984-09-28 to 1986-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Mobil Corp → Superior Oil Company; 1984-09-28 to 1985-11-03; source msha-controller-operator-history
- **operator_operates_mine:** Long Lac Mineral Exploration (Texas) Inc → Sloan Diamond Project; 1985-11-04 to 1989-10-18; source msha-controller-operator-history
- **controller_controls_mine:** Lac Minerals Ltd → Sloan Diamond Project; 1985-11-04 to 1989-10-18; source msha-controller-operator-history
- **controller_controls_operator:** Lac Minerals Ltd → Long Lac Mineral Exploration (Texas) Inc; 1985-11-04 to 1989-10-18; source msha-controller-operator-history
- **operator_operates_mine:** Dia Met Minerals Ltd → Sloan Diamond Project; 1989-10-19 to 1993-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Fipke Wayne → Sloan Diamond Project; 1989-10-19 to 1993-12-07; source msha-controller-operator-history
- **controller_controls_operator:** Fipke Wayne → Dia Met Minerals Ltd; 1989-10-19 to 1993-12-07; source msha-controller-operator-history
- **operator_operates_mine:** L E L Construction → Sloan Diamond Project; 1993-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Luzar Lawrence E → Sloan Diamond Project; 1993-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Luzar Lawrence E → L E L Construction; 1993-12-08 to current/open; source msha-controller-operator-history