# Lonestar Prospects, Ltd.

- **MSHA mine ID:** 4105329
- **Status:** Active
- **Type / commodity:** Surface / Construction Sand and Gravel
- **Location:** Winkler, TX
- **Operator:** Lonestar Prospects, Ltd.
- **Controller:** Ares Capital Corporation; AC American Fixed Income IV L.P.; AG Energy Fu
- **Public source rows linked:** 2,545
- **Source coverage:** 14 / 20
- **Generated:** 2026-10-17T06:17:15.228Z

## Current entity hierarchy

**Ares Capital Corporation; AC American Fixed Income IV L.P.; AG Energy Fu (0158881) → Lonestar Prospects, Ltd. (0186595) → Lonestar Prospects, Ltd. (4105329)**

Current identity source: `msha-mines`. This is a current snapshot, not a historical claim.

## Controller and operator valid-time history

- **MWR Holdings LLC et al → Vista Proppants and Logistics:** 2018-01-25 through 2017-11-16; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **RJS Holdings LLC et al → Vista Proppants and Logistics:** 2018-01-25 through 2017-11-16; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **MWR Holdings, LLC et al → Vista Proppants and Logistics:** 2018-01-25 through 2020-10-08; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **GBH Holdings, LLC et al → Vista Proppants and Logistics:** 2018-01-25 through 2020-10-08; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **Ares Capital Corporation et al → V SandCo, LLC:** 2020-10-09 through 2022-08-30; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **AG Energy Funding LLC → V SandCo, LLC:** 2020-10-09 through 2022-08-30; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **AC American Fixed Income IV L.P. → V SandCo, LLC:** 2020-10-09 through 2022-08-30; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **Ares Capital Corporation et al → Lonestar Prospects, Ltd.:** 2022-08-31 through current/open; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **AC American Fixed Income IV L.P. → Lonestar Prospects, Ltd.:** 2022-08-31 through current/open; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.
- **AG Energy Funding LLC → Lonestar Prospects, Ltd.:** 2022-08-31 through current/open; derived from co-tenure at mine 4105329; source `msha-controller-operator-history`.

- History rows: 10
- Typed edges: 17
- Interval anomalies: 2
- Valid-time bounds: inclusive; date granularity; null end means open-ended in the upstream history row; not independent proof of present control.
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00.

## Assessment signals

1. **SAFETY — 5 since 2021:** Accidents and injuries 16 historical accident/injury rows; 0 coded fatalities and 660 lost days across the published record.
2. **COMPLIANCE — 91 since 2021:** Violations and penalties 167 violation rows across the full record; 36 carry an S&S flag and $53,707 appears in current assessed amounts.
3. **HEALTH — 10 samples:** Occupational health samples 10 personal. 0 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.
4. **PRODUCTION — No published quarter:** Quarterly production and employment The source remains registered, but no mine-keyed quarterly production row was published.
5. **LEGAL — 67 linked rows:** Contests, conferences and decisions 33 contested-violation rows, 33 civil-penalty docket/decision rows, and 1 conference records linked by issuance number.
6. **CONTRACTORS — 5 linked entities:** Contractors Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.
7. **INSPECTIONS — 15 since 2021:** Inspections 35 inspection events and 1K published inspection hours across the historical record.

## EIA annual operating context

No matched record in the 2024 EIA coal-public workbook. This may be inapplicable for a non-coal operation.

## Recent Title 30 crosswalk

Snapshot current through 2026-08-19.

- **30 CFR 56.14112 — Construction and maintenance of guards.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14112
- **30 CFR 56.14107 — Moving machine parts.** (4 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14107
- **30 CFR 47.44 — Temporary, portable containers.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-H/part-47/subpart-E/section-47.44
- **30 CFR 56.14205 — Machinery, equipment, and tools.** (2 retained recent rows) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-M/section-56.14205
- **30 CFR 56.12025 — Grounding circuit enclosures.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-K/section-56.12025
- **30 CFR 56.11001 — Safe access.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-J/section-56.11001
- **30 CFR 56.4130 — Electric substations and liquid storage facilities.** (1 retained recent row) — https://www.ecfr.gov/current/title-30/chapter-I/subchapter-K/part-56/subpart-C/section-56.4130

## Source coverage

- **Accident, Injuries, and Illnesses:** 16 rows; 2018-03-02 through 2026-05-06; source ID `msha-accidents`
- **Addresses of Record:** 1 rows; 2018-10-01 through 2018-10-01; source ID `msha-addresses`
- **Assessed Violations:** 166 rows; 2018-07-03 through 2026-06-05; source ID `msha-assessed-violations`
- **Civil Penalty Dockets and Decisions:** 33 rows; 2019-01-02 through 2026-05-20; source ID `msha-civil-penalty-dockets-decisions`
- **Conferences:** 1 rows; 2020-04-17 through 2020-04-17; source ID `msha-conferences`
- **Contested Violations:** 33 rows; 2018-07-05 through 2026-06-03; source ID `msha-contested-violations`
- **Contractor Employment and Production — Quarterly:** 1,671 rows; unknown through unknown; source ID `msha-contractor-production-quarterly`
- **Contractor Employment and Production — Yearly:** 384 rows; unknown through unknown; source ID `msha-contractor-production-yearly`
- **Controller and Operator History:** 10 rows; 2018-01-25 through 2022-08-31; source ID `msha-controller-operator-history`
- **Inspections:** 35 rows; 2018-01-31 through 2026-06-01; source ID `msha-inspections`
- **Mine Employment and Production — Yearly:** 17 rows; unknown through unknown; source ID `msha-mine-production-yearly`
- **Mines:** 1 rows; unknown through unknown; source ID `msha-mines`
- **Metal and Nonmetal Personal Health Samples:** 10 rows; 2018-08-01 through 2020-02-19; source ID `msha-personal-health-samples`
- **Violations:** 167 rows; 2018-07-03 through 2026-06-05; source ID `msha-violations`

## Caveats

- This is public-record decision support, not legal advice or an official MSHA record.
- Missing data can indicate no event, publication delay, an unresolved identity, or inapplicability.
- Contractor production data is entity-level and is not attributed to this mine.

## Alternate representations

- HTML: `/mines/lonestar-prospects-ltd-4105329`
- JSON: `/api/v1/mines/lonestar-prospects-ltd-4105329`
- Silica records, units, sample status and quarterly means: `/api/v1/mines/4105329/silica` (snapshot year by default; `?year=all` for history; `&format=csv` for all matching rows)
- Relationship JSON: `/api/v1/mines/4105329/relationships`
- MCP resource: `mine://4105329/assessment`
- Complete Title 30 corpus: `/data/title30-sections.json`