# Relationship history for MSHA mine 0202145

Current hierarchy: **Saint-Gobain → Western Mining and Minerals, Inc. → Black Rock 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:** Philadelphia Development Corp Inc → Black Rock Mine; 1983-03-01 to 1985-03-24; source msha-controller-operator-history
- **controller_controls_mine:** Berry  Howie → Black Rock Mine; 1983-03-01 to 1985-03-24; source msha-controller-operator-history
- **controller_controls_operator:** Berry  Howie → Philadelphia Development Corp Inc; 1983-03-01 to 1985-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Zonah Corp → Black Rock Mine; 1985-03-25 to 1989-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Freeberg → Black Rock Mine; 1985-03-25 to 1989-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Freeberg → Zonah Corp; 1985-03-25 to 1989-02-28; source msha-controller-operator-history
- **operator_operates_mine:** D G Jones & Son Company → Black Rock Mine; 1989-03-01 to 1989-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Douglas G  Jones → Black Rock Mine; 1989-03-01 to 1989-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Douglas G  Jones → D G Jones & Son Company; 1989-03-01 to 1989-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Western Gypsum Corp → Black Rock Mine; 1990-01-01 to 2000-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Don G  Cecala → Black Rock Mine; 1990-01-01 to 2000-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Don G  Cecala → Western Gypsum Corp; 1990-01-01 to 2000-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Western Mining & Minerals Inc → Black Rock Mine; 2000-12-15 to 2002-04-24; source msha-controller-operator-history
- **controller_controls_mine:** James Hardie Industries Ltd → Black Rock Mine; 2000-12-15 to 2002-04-23; source msha-controller-operator-history
- **controller_controls_operator:** James Hardie Industries Ltd → Western Mining & Minerals Inc; 2000-12-15 to 2002-04-23; source msha-controller-operator-history
- **controller_controls_mine:** BPB Plc → Black Rock Mine; 2002-04-24 to 2007-01-08; source msha-controller-operator-history
- **controller_controls_operator:** BPB Plc → Western Mining & Minerals Inc; 2002-04-24 to 2002-04-24; source msha-controller-operator-history
- **operator_operates_mine:** BPB Gypsum, Inc. → Black Rock Mine; 2002-04-25 to 2005-04-30; source msha-controller-operator-history
- **controller_controls_mine:** BPB Plc → Black Rock Mine; 2002-04-25 to 2006-12-31; source msha-controller-operator-history
- **controller_controls_operator:** BPB Plc → BPB Gypsum, Inc.; 2002-04-25 to 2005-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Western Mining and Minerals, Inc. → Black Rock Mine; 2005-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James Hardie Industries Ltd → Western Mining and Minerals, Inc.; 2005-05-01 to 2002-04-23; source msha-controller-operator-history
- **controller_controls_operator:** BPB Plc → Western Mining and Minerals, Inc.; 2005-05-01 to 2007-01-08; source msha-controller-operator-history
- **controller_controls_mine:** Saint-Gobain → Black Rock Mine; 2007-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saint-Gobain → BPB Gypsum, Inc.; 2007-01-01 to 2005-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Saint-Gobain → Black Rock Mine; 2007-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Saint-Gobain → Western Mining & Minerals Inc; 2007-01-09 to 2002-04-24; source msha-controller-operator-history
- **controller_controls_operator:** Saint-Gobain → Western Mining and Minerals, Inc.; 2007-01-09 to current/open; source msha-controller-operator-history