Remote Detection and Field Verification of Gold-Bearing Alluvial Deposits

Location: Forks of Salmon, Northern California

Key Project Outcomes

• Identification of previously overlooked paleo-channel structures associated with historical river migration

• Successful field verification of remotely detected alluvial depositional targets

• Initial gold recovery was observed during the first sampling event over 300 feet from the active river system

• Recovery of approximately 50% of the survey cost within the first week of manual testing

A landowner in the Forks of Salmon region of Northern California approached our team to evaluate a property situated adjacent to the Salmon River. Based on local geological history and previous dredging activity conducted during the mid-20th century, the landowner suspected that historical river migration may have left portions of undisturbed alluvial ground capable of hosting residual placer gold mineralization.

Initial satellite survey data analysis was conducted to assess the property and identify geological signatures associated with historical fluvial movement and sediment deposition. Early interpretation indicated that the specific area originally suspected by the landowner showed limited evidence of significant gold-bearing concentration.

However, broader analysis of the survey data revealed several zones associated with an interpreted paleo-channel system, indicating that the Salmon River had historically passed through portions of what is now the landowner’s property. These areas exhibited characteristics consistent with preserved alluvial flood deposits, suggesting the possibility of placer gold accumulation outside previously dredged sections.

Following completion of the initial survey work, our team was brought in during the testing phase to assist with evaluating the identified targets and prioritizing locations for manual sampling and field verification.

Due to limited resources available for large-scale testing, an on-site field visit was conducted to validate the findings and identify the highest-priority areas for initial sampling.

The first pan sample collected from one of the identified flood deposits, located more than 300 feet from the current river channel, immediately produced visible gold recovery. Initial sampling yielded approximately 23 visible gold particles (“colors”), providing direct field confirmation of the interpreted depositional environment.

Within less than one week of follow-up manual panning activities, the project recovered material representing nearly half of the initial survey cost.