Bison Resources (ASX:BSR) has reported silver, copper, lead and zinc mineralisation at its Ruby Lake and Cherry Springs projects in Elko County, northeast Nevada, USA, with surface rock chip sampling returning results of up to 43 g/t silver and 2.8% lead at Ruby Lake, confirming the presence of intrusion-related mineral systems across both projects.

Key Points

  • Surface rock chip sampling at Ruby Lake returned up to 43 g/t silver and 2.8% lead, defining a 2.7 km-long silver-lead-zinc anomaly along the southern margin of the Ruby Stock intrusion.
  • A total of 146 surface rock chip and float samples have been collected at Ruby Lake, with assay results received for all samples.
  • At Cherry Springs, 594 surface rock chip and float samples returned results of up to 1.4% lead, 2.0% zinc and 0.2% copper, coincident with magnetic highs on the margin of the Cherry Stock intrusion.
  • Drillhole planning is underway to target intrusion-related mineralisation at both the Ruby Lake and Cherry Springs projects.

Ruby Lake Surface Sampling Results

Bison Resources disclosed that 146 surface rock chip and float samples have been collected at the Ruby Lake Project, primarily focused along the southern margin of the Ruby Stock intrusion. Assay results have been received for all samples, with the highest result of 43 g/t silver and 2.8% lead recorded in sample RLR0046. The results define a 2.7 km-long silver-lead-zinc anomaly hosted in calcareous mudstones and chert in contact with the southern margin of the Ruby Stock. The company stated that follow-up sampling is required along the northern and western margin of the intrusion to determine the potential for additional mineralisation.

Cherry Springs Copper-Lead-Zinc Anomalism

At the Cherry Springs Project, 594 surface rock chip and float samples were collected as part of a baseline survey. Assay results have been received for all samples, highlighting copper-lead-zinc anomalism hosted within iron-silica alteration and gossanous breccias. Results returned grades of up to 1.4% lead, 2.0% zinc and 0.2% copper, coincident with distinct magnetic highs located along structures adjacent to the margin of the Cherry Stock intrusion. The filing states that geochemical anomalism exhibits a distinct zonation, with lead-zinc-dominant anomalism in the north of the project and a copper-dominant zone in the south.

Nevada Project Portfolio and Next Steps

Bison Resources' Nevada portfolio comprises four projects — Ruby Lake, Cherry Springs, Bald Peaks and Medicine Range — collectively covering 456 unpatented lode mining claims across approximately 38.1 km², situated approximately 80 km southeast of Elko. The company disclosed that no known previous exploration has been undertaken across the projects. Bison Resources CEO Tim Mackellar stated that assays and geophysical interpretation are near completion, with the next step being to integrate datasets and rank targets for maiden drilling. The company said drillhole planning is underway to target intrusion-related mineralisation at the Ruby Lake and Cherry Springs projects.