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Nadaleen Trend
In late July 2010, a new discovery of gold mineralization was made 100 km east of the Tiger Zone while following up anomalous arsenic values documented in the Yukon Geological Survey stream sediment geochemical data base. Prospecting and soil geochemical sampling by ATAC has outlined six areas of gold mineralization in bedrock and talus within a 2 km by 3 km area at the east end of a 25 km long belt of anomalous arsenic geochemistry termed the Nadaleen Trend. Assays of mineralized limestone samples range from less than 1 g/t gold to 66.6 g/t gold.
Mineralization
The primary focus of the 2011 exploration program in the Nadaleen Trend was delineation of Carlin Type gold mineralization. Additionally, a concurrent and aggressive regional exploration program involving geological mapping and geochemical sampling along the entire 185 km long claim block was also undertaken.
Seven areas of Carlin-type gold mineralization are present within the Nadaleen Trend, where 89 diamond drill holes totalling 26,600 m were completed. This work has outlined significant mineralization on the Conrad, Osiris, Isis and Isis East occurrences. Host rocks are Middle Proterozoic to Lower Paleozoic silty limestone, calcareous diamictites, non-calcareous siliciclastics and mafic intrusions that have undergone polyphase deformation.
Gold mineralization occurs within all units but is best developed within the limestone sequences where alteration is characterized by decalcification accompanied by peripheral calcite flooding. Mineralization within non-calcareous rocks is generally by brittle fracturing and directly associated with fault breccia and/or intense fracture development. Gold mineralization is most commonly associated with black, fine grained sooty pyrite, and is sometimes accompanied by the arsenic sulphides realgar and orpiment.
The setting, mineralization and alteration of the Nadaleen Trend showings are completely consistent with their classification as Carlin-type gold deposits.
2010 Exploration
- 1,898 metres in 9 diamond drill holes
- Prospecting, stream sediment and soil sampling
- Discovery of 4 zones: Osiris, Conrad, Eaton and Isis
- Nadaleen Trend defined over 25 km
- Total of 26,600 m in 81 holes completed
- Five drill-confirmed zones within a 4 x 3 km area: Osiris, Conrad, Isis East, Isis and Amon
- Total vertical extent of gold mineralization between Conrad and Osiris is in excess of 1 km
- Drilling extended Conrad to ~500 m length x 500 m depth and remains open to the north, east, west and at depth
- 93% of holes drilled at Conrad intersected better than 3.0 g/t gold over 3 m
- Osiris strike length extended over 800 m toward Nadaleen feeder system and remains open at depth
- All 29 holes that intersected the Osiris mineralized zone in 2010 and 2011 encountered gold mineralization with 20 drill holes intersecting better than 3.25 g/t gold across significant widths
- Regional targets, Pyramid, Dale and Ptah to be followed-up on in 2012
- ~30,000 m of definition and expansion drilling at Conrad, Osiris, Isis East and other Nadaleen Trend targets
- Follow-up grid geochemical sampling, prospecting and first-pass drilling to test multiple property-wide geochemical and structural targets
- Scout drill testing of structural targets along the Nadaleen feeder fault and other structures that exhibit surface pathfinder element signatures
- Auger drilling at the Pyramid target to identify the bedrock source of a 500 by 200 m gold pathfinder arsenic/thallium soil geochemical anomaly coincident with abundant orpiment and realgar cobbles and boulders in glacial till