Mining Intelligence and News

Tiger (Rackla) Project

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Mine TypeOpen Pit
StagePreliminary Economic Assessment
  • Gold
Mining Method
  • Truck & Shovel / Loader
Mine Life... Lock
SnapshotThe Tiger - Rackla project has a Class 3 Quartz Mining Land Use Approval LQ00531 approved by the Yukon Environmental and Socio-Economic Assessment Commission.

Tiger remains open for expansion in multiple directions and extensive exploration opportunities exist throughout the Rackla Gold Property.


Hecla Mining Company 100 % Indirect
The Tiger (Rackla) Project is 100% owned by ATAC, totaling 665.9 km2 (66,590 ha).

On July 7, 2023, Hecla Mining Company completed the acquisition of ATAC Resources Ltd.

ATAC is now a wholly-owned indirect subsidiary of Hecla.

Deposit type

  • Sediment-hosted
  • Carbonate replacement
  • Vein / narrow vein


Several types of mineralization are known to occur on the Property including:
1. sediment-hosted replacement-style gold
2. zinc ± silver ± lead ± gold ± bismuth in limonite-rich veins and replacement bodies
3. scheelite in tremolite skarns
4. pyrrhotite ± scheelite ± chalcopyrite in actinolite-diopside ± garnet skarns
5. wolframite ± tantalite in granite
6. gold bearing quartz-boulangerite veins
7. pyrite-sphalerite-galena in carbonate replacement deposits.

Sediment-hosted replacement style gold mineralization is the most significant economic mineralization explored on the Property to date. Known showings of this type include the Tiger Deposit.

The Tiger Deposit is located 3 km west-northwest of the Rackla Pluton in a moderate to steep walled valley. It consists of a thick northwesterly trending body of carbonate replacement style gold mineralization hosted by a variably northeast dipping horizon. It has been delineated for about 900m along strike and about 400m in dip extent. The mineralization occurs in multiple zones over an aggregate thickness of up to about 150m. Mineralization is developed within and adjacent to a regionally extensive corridor of highly strained rocks that are manifested as a 40 to 150 m wide zone of small-scale folding and shearing. The geometry of the mineralized system is defined by a series of stacked and folded carbonate horizons intercalated with locally extensive mafic flows and volcaniclastic units.

Most of the exploration at the Tiger Deposit has been directed toward the Discovery Horizon, although there is evidence of at least one additional stratabound interval of gold mineralization above the Discovery Horizon.

Due to a combination of topography, overburden and stratigraphic orientation, the Discovery Horizon is the only mineralized horizon observed at surface. It is exposed over a 75 m long by 10 m wide area on the east side of Tiger Creek. At the northeast end of this exposure, a hand trench dug in 2009 uncovered moderately oxidized limonite boxwork with remnant sulphide mineralization, capped by highly sericite altered volcaniclastic unit. Two samples of sub crop collected in 2008 from near this trench returned 22.5 g/t gold, greater than 1% arsenic, 415 ppm bismuth, and 116 ppm tungsten; and 13.6 g/t gold, greater than 1% arsenic, 410 ppm bismuth, and 51.9 ppm tungsten.

Gold occurs in both sulphide and oxide facies mineralization at the Tiger Deposit. Sulphide mineralization is accompanied by, and developed within, limestone that is replaced by ferruginous dolomite and iron carbonate minerals. Sulphide species consist of disseminated to banded pyrite, with subordinate arsenopyrite and pyrrhotite and minor bismuthinite and sphalerite. Variable amounts of disseminated scheelite are also present. The main sulphide minerals exhibit at least three stages of mineralization.

Oxide mineralization contains weakly disseminated scheelite and is completely devoid of all sulphide minerals. The oxidized rock ranges from very competent, weakly porous limonitic mud to rubbly porous limonitic grit. It appears texturally amorphous within most intersections but occasionally exhibits residual color banding that may represent relict sulphide textures. Complete oxidation extends up to 150 m from surface. The highestgrade and deepest oxidation occurs where northerly trending extensional faults intersect the northwest trending regional shear structure. Detailed observations predominantly collected from drill core on site are described below with respect to pre-mineralizing ground preparation and sulphide/oxide paragenesis. Much of this work is based on paragenetic studies conducted by Eric Theissen for his Master’s thesis (Theissen 2013).

The overall character of the oxide zone is partial to complete destruction of primary features and rarely preserved secondary features. The oxide is a combination of siderite, goethite and limonite (potentially more phases) that vary from moderately hard competent sections to gritty- clay to silt rich rubble. Oxide colour varies from deep red to bright orange-rust to dark brown in color.

Transition zones of oxide to sulphide where the rock has not undergone complete destruction, support first order observations that can be made on general paragenesis. Non-oxidized rock is often equivalent to Tiger Deposit sulphide mineralization with minor but important differences. Typically the ankerite and phase three minerals are present; however there is usually a depletion of arsenopyrite accompanied by strong iron staining throughout. Strongly oxidized portions may show a fine-grained diffuse pyrite (pyrite-2?) that is resistant to the oxidation. Brittle core axis parallel fractures occur more frequently in these sulphide-oxide transition zones and are thought to be attributed to a higher fracture density proximal to the late north trending structures.



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CommodityUnitsAvg. AnnualLOM
Gold koz 44267
All production numbers are expressed as metal in doré.

Operational metrics

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* According to 2020 study.

Production Costs

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* According to 2020 study / presentation.

Operating Costs

OP mining costs ($/t mined) CAD 4.28 *  
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* According to 2020 study.

Project Costs

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Processing OpEx $M CAD 81
Site services costs $M CAD 12.7
G&A costs $M CAD 41.6
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Mine Management

Job TitleNameProfileRef. Date
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