Casa Berardi gold mine

Casa Berardi Underground Gold Mine is situated 95 kilometres north of La Sarre, Quebec and straddles a 37 kilometre section of the Casa Berardi fault.

Ownership:

100% – Hecla Mining.

The Casa Berardi gold deposits are located along a five kilometre east-west mineralized corridor. They include the East and West mines, and the Principal Zones.

The mine has produced approximately 1.9 million recovered gold ounces since commencing production in 1988, including about 931,244 recovered ounces since production recommenced in November 2006.

The West Mine shaft deepening project, which included construction of loading pockets and other related infrastructure, was completed in the fourth quarter of 2014, and is improving mine operations by providing additional access to the 118 and 123 zones for transporting ore and waste from underground. Excavation of the 985 drift (previously referred to as 1010) from the deepened shaft is underway. This drift is expected to improve ventilation and material handling and also provide a platform for deeper exploration drilling.

The Company is now producing ore from the East Mine Crown Pillar (EMCP) pit. Located near the East mine, the capital for this shallow pit project is expected to be $39 million over 5.5 years. The project has an expected IRR of 90%, contributed 27,588 ounces in 2019, and is expected to produce about 30,000 ounces of gold until the end of the project.

Mining Methods‎:

Underground trackless mine accessed by declines and a shaft;  Longhole Transversal Stoping in 10 metres or more mineralization width, and Longitudinal Retreat Stoping in narrower ore bodies.

Processing Methods:

Gravity Separation, CIL, Elution and Electrowinning.

Deposit Type:

Archean sedimentary-hosted lode gold deposit.

Mine Life‎: ‎

15 years (as of Jan 1, 2018).

Production:

134 kozt of Au in 2019.

Cash Cost:

$1,051/ozt in 2019.

Reserves / Resources (12/31/2019): 

1,718 kozt – P&P; 2,031 – MI&I

(As of December 31, 2019 unless otherwise noted)
 TonsSilverGoldLeadZincSilverGoldLeadZinc
(000)(oz/ton)(oz/ton)(%)(%)(000 oz)(000 oz)(Tons)(Tons)
Open Pit – 
Proven Reserves (1,2)5,8730.08447
Probable Reserves (1,2)11,8020.07809
Proven and Probable Reserves (1,2)17,6750.071,257
Underground –
Proven Reserves (1,2)9740.16256
Probable Reserves (1,2)1,9780.15305
Proven and Probable Reserves (1,2)2,9520.15461
Open Pit –
Measured Resources (3)1930.024
Indicated Resources (3)3,3410.05155
M&I Resources (3)3,5340.04158
Underground –
Measured Resources (3)1,8410.15273
Indicated Resources (3)4,4630.14631
M&I Resources (3)6,3040.14904
Open Pit – 
Inferred Resources (3)11,7240.04498
Underground –
Inferred Resources (3)2,4850.19471

Note: All estimates are in-situ. Resources are exclusive of reserves. Totals may not represent the sum of parts due to rounding.

(1) The term “reserve” means that part of a mineral deposit that can be economically and legally extracted or produced at the time of the reserve determination. The term “economically,” as used in the definition of reserve, means that profitable extraction or production has been established or analytically demonstrated to be viable and justifiable under reasonable investment and market assumptions. The term “legally,” as used in the definition of reserve, does not imply that all permits needed for mining and processing have been obtained or that other legal issues have been completely resolved. However, for a reserve to exist, Hecla must have a justifiable expectation, based on applicable laws and regulations, that issuance of permits or resolution of legal issues necessary for mining and processing at a particular deposit will be accomplished in the ordinary course and in a timeframe consistent with Hecla’s current mine plans.

(2) Mineral reserves are based on $1300 gold and a US$/CAN$ exchange rate of 1:1.35 Reserve diluted to an average of 34.7% to minimum width of 9.8 feet (3 m). The average cut-off grades at Casa Berardi are 0.105 oz/ton gold (3.49 g/tonne) for underground mineral reserves and 0.025 oz/ton gold (0.85 g/tonne) for open pit mineral reserves.

(3) Measured, indicated and inferred resources are based on $1,500 gold and a US$/CAN$ exchange rate of 1:1.35  Underground resources are reported at a minimum mining width of 6.6 to 9.8 feet (2 m to 3 m).  The average cut-off grades at Casa Berardi are 0.105 oz/ton gold (3.49 g/tonne) for underground mineral resources and 0.025 oz/ton gold (0.85 g/tonne) for open pit mineral resources.


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