ISS on Monday had recommended Turquoise Hill shareholders to vote "against" the deal, joining the Canadian miner's second-largest shareholder Pentwater Capital Management.
Imerys unveiled plans to develop a lithium mine in central France that it said could be a leading contributor in Europe's quest for electric-vehicle battery materials.
The second-largest US steelmaker said Tuesday that it is being hit by higher input costs and maintenance activities, which led to adjusted earnings before items of $436 million in the third quarter, about 50% below analyst estimates.