# Relationship history for MSHA mine 2902107

Current hierarchy: **Humic Growth Solutions LLC dba HGS BioScience → Menefee Mining Corp → Black Spring 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

- **operator_operates_mine:** Menefee Mining Corp → Black Spring Mine; 1993-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John F  Lown → Black Spring Mine; 1993-02-01 to 2025-08-31; source msha-controller-operator-history
- **controller_controls_operator:** John F  Lown → Menefee Mining Corp; 1993-02-01 to 2025-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Humic Growth Solutions LLC dba HGS BioScience → Black Spring Mine; 2025-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Humic Growth Solutions LLC dba HGS BioScience → Menefee Mining Corp; 2025-09-01 to current/open; source msha-controller-operator-history