# Relationship history for MSHA mine 0300681

Current hierarchy: **Ron  Coleman → Ron Coleman Mining Inc → BLOCKER LEAD #4**

- 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:** Quartz Processing Corp → BLOCKER LEAD #4; 1950-01-01 to 1981-08-26; source msha-controller-operator-history
- **controller_controls_mine:** Wacom Corp → BLOCKER LEAD #4; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wacom Corp → Quartz Processing Corp; 1950-01-01 to 1981-08-26; source msha-controller-operator-history
- **operator_operates_mine:** Arkansas Quartz → BLOCKER LEAD #4; 1981-08-27 to 1983-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Gunther  Brommont → BLOCKER LEAD #4; 1981-08-27 to 1983-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Gunther  Brommont → Arkansas Quartz; 1981-08-27 to 1983-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Geomex Mine Services Inc → BLOCKER LEAD #4; 1983-09-15 to 1988-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Geomex Development Inc → BLOCKER LEAD #4; 1983-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geomex Development Inc → Geomex Mine Services Inc; 1983-09-15 to 1988-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Ron Coleman Mining Inc → BLOCKER LEAD #4; 1988-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Coleman → BLOCKER LEAD #4; 1988-04-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Coleman → Ron Coleman Mining Inc; 1988-04-06 to current/open; source msha-controller-operator-history