# Relationship history for MSHA mine 2302201

Current hierarchy: **BMC Enterprises Inc → BMC Sand, LLC → BMC Sand - Old Monroe**

- 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:** Lincoln County Sand & Gravel Incorporated → BMC Sand - Old Monroe; 2000-05-01 to 2016-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Lincoln County-Mo → BMC Sand - Old Monroe; 2000-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lincoln County-Mo → Lincoln County Sand & Gravel Incorporated; 2000-05-01 to 2016-03-31; source msha-controller-operator-history
- **operator_operates_mine:** BMC Sand, LLC → BMC Sand - Old Monroe; 2016-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** BMC Enterprises Inc → BMC Sand - Old Monroe; 2016-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** BMC Enterprises Inc → BMC Sand, LLC; 2016-04-01 to current/open; source msha-controller-operator-history