Hycroft Mining (HYMC) shares gained after the company said Monday its latest drilling program confirmed the presence of high-grade silver at the Vortex system within its Nevada mine.

Shares of the miner jumped 16% as intraday trading volume rose to nearly 10 million from a daily average of about 1.99 million.

EUDA Health (EUDA), a Singapore-based healthcare provider in Asia, unveiled on Tuesday a "significant acceleration of its longevity and regenerative medicine strategy" with the launch of a stem cell therapy platform and establishment of its first clinic in Shenzhen, China.

Shares of the firm surged 40% as intraday trading volume jumped to more than 4.4 million, versus a daily average of roughly 98,000.

U.S. Gold (USAU) said Tuesday it has closed a private placement of about 1.9 million of its common shares at $16.25 apiece and warrants for gross proceeds of roughly $31.2 million.

The company plans to use the net proceeds to fund initial development of a gold project, among other things.

Shares of the gold miner advanced 12% as intraday trading volume climbed to more than 991,600 from a daily average of about 307,500.

Price: 28.33, Change: +3.81, Percent Change: +15.54