# Relationship history for MSHA mine 1202042

Current hierarchy: **The Heritage Group → Speedway Sand & Gravel, LLC → Kimmel Gravel**

- 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:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Kimmel Gravel; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Gary  Niblock → Kimmel Gravel; 1987-06-16 to 2019-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard L  Sibert → Kimmel Gravel; 1988-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** State Line Sand & Gravel Inc → Kimmel Gravel; 1988-10-01 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Richard L  Sibert → State Line Sand & Gravel Inc; 1988-10-01 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → Kimmel Gravel; 1991-03-01 to 1995-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1991-03-01 to 1995-08-14; source msha-controller-operator-history
- **controller_controls_mine:** John E  Merritt → Kimmel Gravel; 1992-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Merritt Sand & Gravel Inc → Kimmel Gravel; 1995-08-15 to 2005-10-02; source msha-controller-operator-history
- **controller_controls_operator:** John E  Merritt → Merritt Sand & Gravel Inc; 1995-08-15 to 2005-10-02; source msha-controller-operator-history
- **controller_controls_mine:** Todd  Fredrick → Kimmel Gravel; 2005-06-03 to 2023-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Niblock Excavating → Kimmel Gravel; 2005-10-03 to 2025-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Niblock → Niblock Excavating; 2005-10-03 to 2019-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Kimmel Gravel; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Company; 2007-11-16 to 1995-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Chase  Niblock et al → Kimmel Gravel; 2019-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chase  Niblock et al → Niblock Excavating; 2019-04-01 to 2025-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Chad  Niblock et al → Niblock Excavating; 2019-04-01 to 2025-12-31; source msha-controller-operator-history
- **controller_controls_mine:** The Heritage Group → Kimmel Gravel; 2023-05-29 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Speedway Sand & Gravel, LLC → Kimmel Gravel; 2026-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Todd  Fredrick → Speedway Sand & Gravel, LLC; 2026-01-01 to 2023-05-28; source msha-controller-operator-history
- **controller_controls_operator:** The Heritage Group → Speedway Sand & Gravel, LLC; 2026-01-01 to current/open; source msha-controller-operator-history