---
schema_version: "secwatch.filing_event.v1"
accession: "0001558370-23-016891"
form_type: "8-K"
ticker: "GORO"
cik: "0001160791"
company_name: "GOLD RESOURCE CORP"
filed_at: "2023-10-27T23:59:59+00:00"
generated_at: "2026-06-09T06:45:54.752046+00:00"
event_type: "other_material"
sentiment: "positive"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Gold Resource reports Back Forty IA: $214M after-tax NPV, 25.7% IRR

## Summary
- After-tax NPV6 of $214.4M and IRR of 25.7% for Back Forty Project at base-case metal prices.
- LOM production: 504 koz gold, 6,150 koz silver, 61.6 Mlbs copper, 778 Mlbs zinc over 9 years.
- Updated MRE: 14.5M tonnes indicated at 2.21 g/t Au, 26.64 g/t Ag, 0.38% Cu, 3.35% Zn.
- Initial capital cost est. $325.1M; average operating cost $84.81/t milled.
- Project designed with dry-stack tailings, no tailings dam, reducing environmental footprint.

## SEC filing metadata
- accession: 0001558370-23-016891
- form_type: 8-K
- ticker: GORO
- cik: 0001160791
- company_name: GOLD RESOURCE CORP
- filed_at: 2023-10-27T23:59:59+00:00
- event_type: other_material
- sentiment: positive
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 7.01, 8.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1160791/000155837023016891/0001558370-23-016891-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1160791/000155837023016891/goro-20231026x8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001558370-23-016891
- JSON: https://secwatch.observer/filing/0001558370-23-016891.json
- Plain text: https://secwatch.observer/filing/0001558370-23-016891.txt

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