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The results come as the in-demand battery material hit a fresh decade high on the London Metal Exchange last week of US$95,000 per tonne.
The company's underground drilling programme is continuing to explore beyond the historical estimates to the west ahead of an anticipated resource update this year.
"We are excited to continue the rapid exploration and then development of Iron Creek," senior vice president exploration Brian Kirwin said.
Iron Creek is leased from Chester Mining Company (OTC:CHMN) subject to the company's buy-out rights and US Cobalt's exploration is the first conducted at the property in several decades.
First Cobalt Corp (CN:FCC) announced a friendly acquisition of US Cobalt mid-month in a deal worth about C$150 million (US$116 million), to create a vertically-integrated, non-Democratic Republic of Congo, pure play cobalt company.
US Cobalt shares hit a 52-week high on March 16 of C$1.34 and, despite losing 2.5c to close on Friday at $1.26, remain up 110% year-to-date.
