---
schema_version: "secwatch.filing_event.v1"
accession: "0001558370-25-004426"
form_type: "8-K"
ticker: "GORO"
cik: "0001160791"
company_name: "GOLD RESOURCE CORP"
filed_at: "2025-04-04T23:59:59+00:00"
generated_at: "2026-05-23T20:41:44.894501+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.65
calibrated_materiality_score: 0.65
confidence: "high"
source: SEC EDGAR
---

# Gold Resource reports new high-grade Three Sisters vein system; 2024 drill results show up to 15.53 g/t AuEq

## Summary
- 23 underground drill holes totaling 7,671 meters at Don David Gold Mine in Mexico.
- Notable intercepts: 4.70 m at 15.53 g/t AuEq ($966/t NSR) in Sandy 2 vein; 4.48 m at 16.65 g/t AuEq in Sadie 2.
- Three Sisters & Gloria vein system resources up 307% YoY; total LOM plan resource increased 10%.
- Development on Level 4 intersected Sandy veins; channel sample returned 44.23 g/t AuEq ($2,780/t NSR).
- Company expects new areas to reduce haulage costs and improve cash flow; further drilling planned in 2025.

## SEC filing metadata
- accession: 0001558370-25-004426
- form_type: 8-K
- ticker: GORO
- cik: 0001160791
- company_name: GOLD RESOURCE CORP
- filed_at: 2025-04-04T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.65
- calibrated_materiality_score: 0.65
- confidence: high
- sec_items: 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1160791/000155837025004426/0001558370-25-004426-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1160791/000155837025004426/goro-20250403x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001558370-25-004426
- JSON: https://secwatch.observer/filing/0001558370-25-004426.json
- Plain text: https://secwatch.observer/filing/0001558370-25-004426.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.