The Allenby Tailings prospect is on district Lot 2941s, 500 metres southeast of the Similkameen River and 4 kilometres south-southwest of Princeton.
This deposit consists of an old tailings dump from the nearby Allenby mill, which processed copper ores originating from the Similco mine (092HSE001), up to 1957. The dump covers an area 450 metres long and up to 200 metres wide.
Abacus Industries Ltd. processed about 2000 cubic metres of tailings with a pilot mill in 1977 and 1978, in an attempt to recover gold and copper. The company also conducted research on other possible uses for the tailings.