# Relationship history for MSHA mine 0403227

Current hierarchy: **Michael K.  Farmer Jr. → Folsom Ready-Mix, Inc. → China Hill (Volcano) Quarry**

- 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:** John W Dickson → China Hill (Volcano) Quarry; 1950-01-01 to 1993-08-09; source msha-controller-operator-history
- **controller_controls_mine:** John W  Dickson → China Hill (Volcano) Quarry; 1950-01-01 to 1993-08-09; source msha-controller-operator-history
- **controller_controls_operator:** John W  Dickson → John W Dickson; 1950-01-01 to 1993-08-09; source msha-controller-operator-history
- **operator_operates_mine:** Kreth Inc → China Hill (Volcano) Quarry; 1993-08-10 to 2007-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Richard H  Kreth → China Hill (Volcano) Quarry; 1993-08-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Kreth → Kreth Inc; 1993-08-10 to 2007-02-28; source msha-controller-operator-history
- **operator_operates_mine:** Quarry Stone → China Hill (Volcano) Quarry; 2007-03-01 to 2014-01-26; source msha-controller-operator-history
- **controller_controls_mine:** Theodore A  Zebroski → China Hill (Volcano) Quarry; 2007-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Theodore A  Zebroski → Quarry Stone; 2007-03-01 to 2014-01-26; source msha-controller-operator-history
- **operator_operates_mine:** Kreth Inc. → China Hill (Volcano) Quarry; 2014-01-27 to 2020-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Kreth → Kreth Inc.; 2014-01-27 to 2020-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Golden State Crushing → China Hill (Volcano) Quarry; 2020-10-01 to 2024-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Silva → China Hill (Volcano) Quarry; 2020-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Silva → Golden State Crushing; 2020-10-01 to 2024-06-26; source msha-controller-operator-history
- **operator_operates_mine:** FHC California, LLC → China Hill (Volcano) Quarry; 2024-06-27 to 2025-06-15; source msha-controller-operator-history
- **controller_controls_mine:** James Reh  Jackson et al → China Hill (Volcano) Quarry; 2024-06-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James Reh  Jackson et al → FHC California, LLC; 2024-06-27 to 2025-06-15; source msha-controller-operator-history
- **controller_controls_operator:** Michael K.  Farmer Jr. et al → FHC California, LLC; 2024-06-27 to 2025-06-15; source msha-controller-operator-history
- **operator_operates_mine:** Folsom Ready-Mix, Inc. → China Hill (Volcano) Quarry; 2025-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Michael K.  Farmer Jr. → China Hill (Volcano) Quarry; 2025-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael K.  Farmer Jr. → Folsom Ready-Mix, Inc.; 2025-06-16 to current/open; source msha-controller-operator-history