• Past producer - high grade / massive sulphides
    • 32 tonnes mined from Level 1, returned average of 2,638 g/t Ag & 1.7 g/t Au

  • Over 11,000 m drilled with 540 m of adits

  • Level 1 sulphide assays range from 200 - 1,200 g/t of Ag
    • average 330 g/t Ag and 1.2 g/t Au
  • Level 2 assays of 640 g/t of Ag, 2.0 g/t of Au over 6 m at surface

  • Massive-semi-massive sulphide assayed at 1,014 g/t Ag, 0.69 g/t Au, 13.31% Pb

  • Level 3, 10 cm thick, ~ 30-50 m long lens assayed, 1,105 1,451 g/t Ag 4.7 - 18.3 g/t Au


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Gravity Review and Illustration

Modeling of gravity data in the Ptarmigan Basin identified two large anomalies, located on the eastern limb of an anticline.

A network of high grade silver sulphide and/or sulphosalt mineralization is expected to be developed, consisting of manto- and vein-style occurrences.


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The anomalies are interpreted to represent composite manto- and vein-style mineralization hosted within the carbonate (i.e. dolomitic) succession of the Middle Dolomite of the Mount Nelson Formation.


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Two styles of mineralization are found at the Ptarmigan Mine: high grade Cu-Ag-Au veins and Ag-Au-Cu massive pyrite manto type deposits. Mineralization is hosted in brecciated quartz veins and crackled dolomite developed from intensive silica flooding along north-south faults and fracture systems. Cross-faults and drag folds have played key roles in localizing subsequent sulphide mineralization.


Level #1


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The main level of Ptarmigan Mine at elevation 2500m, extends 210 m into the mountain, and includes five raises and three winzes with over 50 m of sub drifting. A silver-rich massive sulphide deposit (Pyrite #1) was developed over a 60 m strike length with widths up to 6 m. 32.2 tonnes mined from Pyrite #1 in 1959 returned 2,638 g/t Ag (77 oz/t) and 1.7 g/t Au based on smelter returns. A sample collected in 2010 from the deposit shows high grade tetrahedrite mineralization which analyzed at 2,210 g/t Ag, 1.8 g/t Au and 1.4% Cu.

IMAGE: Sample from Pyrite #1 Zone shows malachite crust and high grade tetrahedrite (blackish/blue mineral) with massive pyrite.
Adit #2

The massive sulphide Pyrite #2 exposure at surface was the initial focus for development of the Ptarmigan Mine. Adit #2 was developed 25 m and is connected to Level #1 by a raise. Stripping by excavator below the adit in 2009 revealed a massive sulphide body extending 7 m vertical with a base measuring 8 m across. Sampling across 3 panels in 2010 suggests grade increasing with depth (6 m @ 642 g/t Ag, 2 g/t Au).

Massive pyrite zone at Adit #2
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Panel Elevation Length Ag Au Cu Pb Zn
  m M g/t g/t % % %
Top 2611 3.0 212 1.07 0.04 0.03 tr
Middle 2609 2.6 115 0.81 0.03 0.16 tr
Lower 2606 6.0 642 1.96 0.09 0.12 0.01
Average   3.9 413 1.47 0.06 0.10 tr
Geochemical results are weighted average composites for each panel sample


Level #3

The #3 Adit was developed in the steeply-dipping, quartz-pyrite-tetrahedrite West Vein that ultimately produced 350 tons of hand-sorted ore at a grade of 200 oz Ag/ton and 0.3 oz/t Au. #3 Vent Raise access was developed 18 m above #3 Adit to provide ventilation for stoping.


#3 Adit

Massive tetrahedrite found above adit in 2010


High grade tetrahedrite occurred typically as a 4 to 24 wide vein and as blebs and masses in pyrite. The vein was mined by a cut-and-fill stope 18 m vertical by 60 m lateral.


ADDITIONAL INFORMATION

  • 4 MINERALIZED AREAS MAP
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