Thunder Creek and 144 Zone

Pan American Silver Corp.




2013 / 10 / 04




1.0% NSR

The Thunder Creek and 144 properties are part of the Timmins West mine complex in Ontario. The deposits all occur along the 144 Trend, a broad structural corridor that is host to extensive gold mineralization. The gold occurs in steep north-northwest plunging zones within and proximal to the 144 Trend and related structures.

Thunder Creek is an underground mine that has been in production since 2010 and has produced more than 500 kozs of gold. Primary mining methods include longitudinal and transverse longhole stoping and ore is hoisted to surface via a shaft and trucked to the Bell Creek mill for processing. Ore is processed with single-stage crushing and grinding with a portion of the gold recovered by gravity methods, followed by pre-oxidation and cyanidation with carbon-in-leach and carbon-in-pulp recovery. The Probable Reserves at Thunder Creek as of June 2021 totaled 22,000 tonnes at 2.7 g/t gold for 1,900 oz of gold (2.0 g/t cut-off).

Drilling activity at the 144 project led to the discovery of two significant zones of gold mineralization about 750 metres to the southwest of Thunder Creek, the 144 Gap Zone and the 144 Gap SW Zone. The Proven and Probable Reserves as of June 2021 at 144 Gap are 4.9 Mt grading 3.0 g/t for 464.3 kozs of gold (2.0 g/t cut-off).

Recent Activity

August 2022

Pan American announced that 36,900 ounces of gold Mineral Reserves were added at Timmins, replacing 26% of mined production. In addition, exploration drilling has successfully defined 53,000 ounces of new gold Inferred Mineral Resources at the SW144 zone at Timmins.

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