By Fabio Teixeira RIO DE JANEIRO, Feb 3 (Reuters) - Sigma Lithium's waste piles at a Brazilian mine offer no "imminent risk" and the country's mining regulator saw no need to shut them down during a ...

Sigma Lithium said it resumed mining activities at its Mine 1 in Vale do Jequitinhonha in Brazil, concluding the restructuring of mining operations aimed at increasing operating efficiency.

The transaction adds video and sensor integration expertise, while also marking Sigma’s third CJADC2-related acquisition in the past two years. Sigma Defense Systems has moved to strengthen its hand ...

Sigma's bokeh master is a hefty and pricey bit of glass, but it can shoot some of the dreamiest portraits you'll see ...

In February, Sigma announced the Sigma BF. It's a full-frame, interchangeable lens camera with just a shutter release, a dial and three buttons. That minimalism speaks to me, and I felt the BF was ...