Eramet pointed to "exceptional progress" at the plant, which only started operations in 2020, for the new target.
The 10 million wet tonnes in 2021 target is almost double the 6 million expected previously. The company also plans to produce 40,000 tonnes of low-grade nickel ferroalloys.
"[There was] exceptional progress in mining operations in Weda Bay in Indonesia [in the first quarter] with 3.0 Mwmt of nickel ore produced; a strong cash contribution is expected for the Group in 2021."
Mining operations began at Weda Bay in October 2019: the first metric ton of ferronickel was produced, and a 1.6Mth stock of nickel ore was formed.
On April 30, 2020, the first ferronickel casting took place, ahead of the initial schedule - 20 months after construction had begun on the plant.
Eramet reported on Monday that group-wide turnover up 8% in the first quarter, driven by the "strong growth" of the mining and metals division.
Other operating highlights included 1.5 Mt in manganese ore produced in Gabon, a rise of 17% versus the first quarter last year, 1.1 Mwmt of ore produced in New Caledonia, a rise of 14%.
"The strong growth momentum in our mining activities produced the expected results: in the first quarter, our operating performance continued to make progress, in a favourable price environment. Our turnover grew significantly versus the same period for 2020, which was still hardly affected by the pandemic," said Christel Bories, Eramet group chair and CEO.