Scientists have discovered a trove of nearly 600 obsidian hand-axes that were crafted more than 1.2 million years ago in Ethiopia by an unknown group of hominins. This pushes the timeline of obsidian tool use back by 500,000 years.

https://www.vice.com/en/article/n7zx77/archaeologists-discover-12-million-year-old-workshop-in-mind-blowing-find

A surge in obsidian exploitation more than 1.2 million years ago at Simbiro III (Melka Kunture, Upper Awash, Ethiopia)
https://www.nature.com/articles/s41559-022-01970-1.epdf?sharing_token=6H7hHA4WeId5DJPKN5nRg9RgN0jAjWel9jnR3ZoTv0NGmuX0lR0PD9NHM-U5P9w1k72oVvbMm7gEpl_5Bp2o2UaQ3DcebYmzK6wfn2a39cM-wvM3ZY6gpkneT-JpG-o9c1gCDJYJGYPEdvxYNq5bOQR7dKaucu81HthZ8VIC84ljA_PxgYAvTUjjqUjKMc3Y3YGajfKQnc6MK5qr_IZvDQ%3D%3D&tracking_referrer=www.vice.com