# Relationship history for MSHA mine 2602106

Current hierarchy: **Quaterra Resources Inc. → Singatse Peak Services, LLC → COPPER TEK CORP. 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:** Copper Tek Corp → COPPER TEK CORP. MINE; 1989-05-01 to 1989-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Don H  Tibbals → COPPER TEK CORP. MINE; 1989-05-01 to 1989-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Don H  Tibbals → Copper Tek Corp; 1989-05-01 to 1989-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Arimetco Inc → COPPER TEK CORP. MINE; 1989-07-26 to 2011-04-26; source msha-controller-operator-history
- **controller_controls_mine:** Arimetco International Inc → COPPER TEK CORP. MINE; 1989-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arimetco International Inc → Arimetco Inc; 1989-07-26 to 2011-04-26; source msha-controller-operator-history
- **operator_operates_mine:** Singatse Peak Services, LLC → COPPER TEK CORP. MINE; 2011-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quaterra Resources Inc. → COPPER TEK CORP. MINE; 2011-04-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quaterra Resources Inc. → Singatse Peak Services, LLC; 2011-04-27 to current/open; source msha-controller-operator-history