By Eric Onstad
       LONDON, Nov 8 (Reuters) - Copper prices rebounded on
Tuesday on worries about supply and a weaker dollar, shrugging
off an upsurge of COVID-19 cases in the world's top metals
consumer China.
    Benchmark copper         on the London Metal Exchange
        had gained 2.3% to $8,093 a tonne by 1600 GMT after
retreating 2.2% on Monday.
    Copper prices got a boost after Chile's Codelco, the world's
biggest copper miner, proposed a 33.3% increased premium for
2023 supplies to Chinese customers, sources told Reuters.
    Surging premiums come against a backdrop of low inventories
and mining disruptions.
    Codelco's Chuquicamata smelter is due to undergo major
maintenance in November, the company said last month, and a
spokesperson said on Tuesday it would last 135 days. 
    "Being one of the largest open-pit mines in the world and
also one of the largest producers... of refined copper, being
offline for such a substantial period is something to watch
for," broker Marex said in a note.     
    Further boosting gains of industrial metals was a slide in
the dollar index       , making greenback-priced metals more
expensive to holders of other currencies.           
    Copper shot up 7.1% on Friday, its biggest one-day gain
since January 2009, on tight supplies and hopes that China would
ease its strict COVID-19 curbs, which could boost metals demand.
    New coronavirus cases jumped in global manufacturing hub
Guangzhou, data showed on Tuesday, testing the city's ability to
avoid a Shanghai-style lockdown. 
    "The market is trying to find a floor after the big rally on
Friday," said Ole Hansen, head of commodity strategy at Saxo
Bank in Copenhagen. 
    The market tested its first support around $7,880 on Tuesday
morning and it held, giving confidence to bullish investors, he
added. "That's attracting some fresh appetite and technical
buying."
    Copper inventories are also tight, with stocks on the LME
 touching their lowest in more than seven months
on Tuesday, having slid 43% over the past month.
    In China, stockpiles in SHFE and bonded warehouses combined
were at 84,164 tonnes, not far from their record low of 72,159
tonnes hit in October.
    In other metals, LME aluminium         advanced 1.4% to
$2,369 a tonne, zinc         gained 1% to $2,915, nickel        
rose 2.2% to $23,900, tin         jumped 3.2% to $19,550 and
lead         edged up 0.1% to $2,039.
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    ($1 = 7.2596 yuan)
 (Reporting by Eric Onstad; Additional reporting by Mai Nguyen
in Hanoi; Editing by Bernadette Baum and Lisa Shumaker)