Its copper production stood at 301,200 tonnes in the first quarter, but zinc fell 13,000 tonnes year-on-year to 282,600 tonnes and nickel was down 11% at 25,200 tonnes.
Treatment charges (TCs) fall when mine output decreases and smelters compete to get concentrate to process.
Fastmarkets reported that the deals, which are 46% lower than the near $300 a tonne set last year, were concluded last week and will be for supply from Teck's Red Dog mine in Arizona.
First Cobalt will issue 23.8 million common shares to Glencore AG at $0.29 per share, representing about 4.8% of the company's current outstanding shares.
In 2019, First Cobalt entered into a loan agreement with the miner and commodity trader to fund engineering studies, metallurgical testwork and permitting activities for an expansion of the company's refinery in Ontario, Canada.