# Relationship history for MSHA mine 1002277

Current hierarchy: **Halycon LLC; Sharp Resources LLC; Patten Resources LLC → US Calcium LLC → Darlington 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:** US Calcium LLC → Darlington Mine; 2016-07-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ted R Sharp et al → Darlington Mine; 2016-07-24 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ted R Sharp et al → US Calcium LLC; 2016-07-24 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Jay W Larsen et al → US Calcium LLC; 2016-07-24 to 2019-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Sharp Resources LLC et al → Darlington Mine; 2020-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sharp Resources LLC et al → US Calcium LLC; 2020-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Halycon LLC et al → US Calcium LLC; 2020-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patten Resources LLC et al → US Calcium LLC; 2020-01-01 to current/open; source msha-controller-operator-history