Trilogy Metals Logo Key Facts

Alaska, USA
Deposit Type
Volcanogenic Massive Sulphide
Ambler Sequence
Approximate Thickness
700 – 1,850 meters
Main Economic Elements
Copper, Zinc, Lead, Gold, Silver

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  • Notes
    • Reserves estimated assuming open pit mining methods and include a combination of planned and contact dilution. Total dilution is expected to be between 30% and 35%. Pit slopes vary by sector and range from 26° to 43°.
    • Reserves are based on prices of $3.00/lb Cu, $1.00/lb Pb, $1.10/lb Zn, $1300/oz Au and $18/oz. Fixed process recoveries of 91.2% Cu, 80.0% Pb, 91.0% Zn, 58.9% Au and 80.0% Ag.
    • Mining costs: $2.78/t incremented at $0.02/t/5m and $0.015/t/5m below and above 730m elevation respectively.
    • Processing costs: $29.39/t. Include process operating cost: $15.09/t, G&A: $6.55/t, sustaining capital: $1.53/t. closure cost: $1.52/t, road toll: $4.70/t.                                        
    • Treatment costs of $80/t Cu concentrate, $180/t Pb concentrate and $200/t Zn concentrate. Refining costs of $0.08/lb Cu, $10/oz Au, $0.80/oz Ag. Transport cost $270.38/t concentrate.
    • Fixed royalty percentage of 1%.
    • There is a risk to the mineral reserves if the toll road is not built in the time frame required for the Arctic Project, or if the toll charges are significantly different from what was assumed.
    • The presence of talc layers in the rock could affect recoveries in the process plant.  To mitigate this risk the inclusion of a talc recovery circuit is considered in the process plant. Talc content per period has been estimated in the mine production schedule.
    • The geotechnical assumptions used in the pit design may vary in future assessments and could materially affect the strip ratio, or mine access design.
    • The Qualified Person for the reserves estimates is Antonio Peralta Romero P.Eng. who visited the project site in July 2017 as part of the data verification process.
    • The effective date of mineral reserves estimate is January 31, 2020.
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