|Term of Stream: 50 years
|Stream Parameters: 100% of silver production
|Upfront Consideration: US$35M
|Cost Quartile: 3rd
|Primary Metal: Copper
The Neves-Corvo copper-zinc-silver mine is located approximately 220 kilometres southeast of Lisbon in the Alentejo district of southern Portugal.
The underground mine exploits five major orebodies. The principle means of mine access are provided by one vertical five metre diameter shaft and a ramp from surface. The mine is highly mechanized and a number of different stoping methods are employed but the most significant are bench-and-fill and drift-and-fill. The treatment facility at Neves-Corvo comprises of two processing plants. The copper plant treats copper ores and has a maximum capacity of approximately 2.6 Mtpa and the zinc plant (former tin plant) which treats zinc or copper ores was expanded to 1.0 Mtpa capacity during 2011.
Base metal grades are segregated by the strong metal zoning into copper, tin, and zinc zones. The massive sulphide deposits are typically underlain by stockwork sulphide zones which form an important part of the copper orebodies. Neves-Corvo has demonstrated significant exploration upside with discoveries such as the Lombador zinc-lead-silver deposit, which lies immediately north of the existing Neves-Corvo deposits. Recent underground exploration drilling has mainly resulted in forming deeper extensions to the known mineralization.
Precious Metal Purchase Agreement
Silver Wheaton acquired Silverstone Resources Corp. in May 2009, giving Silver Wheaton the right to purchase 100% of the life of mine silver production from the Neves-Corvo mine site for the lesser of US$3.90 per ounce of silver (subject to an annual inflationary adjustment) or the prevailing market price per ounce of silver delivered.
For more information about the Neves-Corvo mine, please visit Lundin Mining’s website at www.lundinmining.com. Cost quartile information is sourced from Wood Mackenzie byproduct cost curves for gold, zinc/lead, copper, nickel, and silver mines.
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