TechGen Metals (ASX:TG1) said it began an induced polarization geophysical survey at the Blue Devil project in Western Australia to cover a zone of high-grade copper gossans and iron-quartz-gold zones, according to a Monday Australian bourse filing.

Rock chip sampling, including 18 samples, of copper gossans close to the MB1 & MB2 induced polarization targets, was recently completed on the Mt Boggola project, also in Western Australia, and the samples are at the laboratory.

The firm's shares fell 5% in recent trading on Monday.