Nadaleen Trend

Nadaleen Trend Highlights

  • Canada's first discovery of Carlin-type gold mineralization
  • Nadaleen Trend defined to a length of 30 km and is comparable in size to the entire northern Carlin Trend of Nevada
  • Hosts the 12 sq/km Osiris Cluster which contains the Conrad, Osiris, Sunrise and Ibis Carlin-type gold mineralized zones
  • Hosts the 18 sq/km Anubis Cluster which contains the Anubis Zone and Ana, Hydra, Corona, Draco, Dorado, Lyra, Orion and Zodiac showings
  • 2015 RAB drilling discovery of 47.24 m of 3.79 g/t gold, 300 m to the west of the Anubis Zone at the Orion target
  • 2016 diamond drilling at Orion returned 61.29 m of 2.75 g/t gold (AN-16-010)
  • Numerous gold and pathfinder soil geochemical anomalies have yet to be drill-confirmed
  • Conrad is the most advanced zone of Carlin-type gold mineralization in the Nadaleen Trend

Geology & Mineralization

Comparison with Nevada

The Nadaleen Trend area was selected by the ATAC geological team for grass-roots Carlin-type gold exploration in 2009 because of the numerous Carlin path-finder element anomalies in government databases from samples of sediment collected from creeks draining the area and, particularly, because of the strong geological similarities between east-central Yukon and northeast Nevada.

Both east-central Yukon and northeast Nevada were on the rifted edge of the Precambrian North American continent. That continental margin became tectonically quiet through the late Precambrian to the Middle Paleozoic, allowing a build-up of bedded silty and sandy carbonate rocks along the paleo-shoreline. These rocks are both porous and permeable, allowing for the dispersion of mineralizing fluids and for the chemical reaction controlling both gold deposition and characteristic Carlin-type alteration by reaction of the gold-bearing hydrothermal fluids with the carbonate host rocks.

Episodic rifting episodes in the Middle Paleozoic caused the deposition of basaltic volcanic layers and bedded barite in both locations. Later continental collisions emplaced deeper water shale sequences over the continental margin along flat-lying thrust faults (Roberts Mountain thrust in Nevada and Dawson Thrust in Yukon). In more recent geological times, reactivation of the ancient Precambrian fault zones along the old continental margin formed the plumbing systems for hydrothermal fluids that deposited the gold.

Along the Nadaleen Trend, Carlin-style mineralization has been drill-proven at the Conrad, Osiris, Sunrise, Ibis, Anubis and Orion zones. Gold mineralization is best developed within Middle Paleozoic to Middle Proterozoic limestone sequences where alteration, characterized by decalcification, occurs in association with realgar (arsenic sulphide) mineralization peripheral to calcite flooding. Mineralization hosted within non-calcareous rocks generally occurs within brittle fractures and is directly associated with fault breccia and/or intense fracture development.

Northeast Nevada accounts for over 90% of the world's known gold endowment contained in Carlin-type or Carlin-like deposits, especially in the Carlin, Cortez, Getchell and Jerritt Canyon Trends. A comparison between Carlin-type gold deposits in Nevada and ATAC's Rackla Gold Project was recently published (see Technical Reports section at the end of this page) and key similarities are summarized below:

Carlin and Nadaleen Trend Comparison

Carlin-type Characteristic

Northeast Nevada

Nadaleen Trend, Yukon

Occur along rifted Precambrian continental margin

Lie beneath a regional scale thrust fault

Silty and sandy carbonate host rock

Gold deposits occur in clusters along ancient faults

Characteristic and unique Carlin-type alteration

Gold occurs in arsenic-rich secondary pyrite

Late stage orpiment, realgar and stibnite minerals

Low silver and base metals

Pathfinder element signature arsenic-thallium-antimony-mercury

Acidic ore fluids between 180 oC and 240oC

  • probably
  • Age of formation between 30 and 40 million years ago

    <60 million years

    Regional Exploration Targets

    The Pharaoh Target is located 11 km northeast of the Conrad Zone and was initially identified in 2010 as a mercury stream sediment anomaly. Follow up prospecting resulted in the discovery of mineralization in several areas within the anomalous drainage basin. The Pharaoh area is underlain by carbonate and calcareous clastic stratigraphy on top of which siliciclastic rocks occur. This particular lithological sequence is similar to the geological setting at the Conrad Zone.

    Detailed contour soil sampling in the vicinity has identified a 6 km long intermittent antimony, arsenic and gold geochemical anomaly. Prospecting near the head of the anomalous drainage system at the eastern part of the target identified two distinct structural systems. The first is comprised dominantly of northwest trending quartz veins containing visible gold with assays from below detection up to 79.40 g/t gold along stylolitic fractures. The second consists of northerly trending breccia/vein zones mineralized with varying amounts of Carlin-style indicator minerals that include stibnite, cinnabar and realgar.

    The Pyramid Target is located 5 km to the west of the Anubis cluster and is defined by an extensive glacially dispersed orpiment/realgar (arsenic sulphides) cobble field measuring 150 by 50 m that lies within a larger 500 by 200 m arsenic/thallium soil anomaly. Arsenic and thallium are strong gold pathfinder elements similar to those defining the Osiris Cluster.

    Complete Nadaleen Trend Drill Results