(Reuters) - CME Group Inc (CME.O), the world's largest commodities exchange, raised margins for Comex 100 Gold Futures <0#GC:> contracts by 19.3% on Tuesday.

The exchange operator raised Comex 100 Gold Futures maintenance margins to $8,350 per contract from $7,000.

Margins are deposits that investors in futures markets pay to an exchange or clearing house to cover the risk of default. Exchanges typically raise margins to mitigate risks as price volatility in the market increases.

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London spot gold prices fell far below U.S. gold futures on Tuesday in a sign the market is worried that air travel restrictions and precious metal refinery closures will hamper shipments of bullion to the United States to meet contractual requirements. U.S. gold futures GCcv1 settled up 5.95% at $1,660.80. [GOL/]

Following are changes in the Comex 100 Gold Futures initial and maintenance margins for speculators since 2009 (in U.S. dollars):

EFFECTIVE DATE MARGINS FOR INITIAL MAINTENANCE PCT CHANGE

March 25, 2020 --- 9,185 8,350.00 +19.3

March 17, 2020 --- 7,700.00 7,000.00 +16.7

March 3, 2020 --- 6,600.00 6,000.00 +9.1

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Feb 26, 2020 --- 6,050.00 5,500.00 +10

Jan 9, 2020 --- 5,500.00 5,000.00 +11.1

Aug 14, 2019 --- 4,950.00 4,500.00 +12.5

June 28, 2019 --- 4,400.00 4,000.00 +8.1

June 21, 2019 --- 4,070.00 3,700.00 +8.8

Oct 12, 2018 --- 3,740.00 3,400.00 +9.7

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March 20, 2018 --- 3,410.00 3,100.00 -11.4

Jan 9, 2018 --- 3,850.00 3,500.00 -12.5

Dec 19, 2017 --- 4,400.00 4,000.00 -10.1

Dec 8, 2017 --- 4,895.00 4,450.00 -9.2

Sept 22, 2017 --- 5,390.00 4,900.00 +8.9

Sept 8, 2017 --- 4,950.00 4,500.00 +5.9

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Aug 11, 2017 --- 4,675.00 4,250.00 +7.6

June 1, 2017 --- 4,345.00 3,950.00 -6.0

March 31, 2017 --- 4,620.00 4,200.00 -12.5

March 3, 2017 --- 5,280.00 4,800.00 -11.1

Jan 13, 2017 --- 5,940.00 5,400.00 -10.0

Nov 3, 2016 --- 6,600.00 6,000.00 +11.1

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Aug 18, 2016 --- 5,940.00 5,400.00 -10.0

July 1, 2016 Spec... 6,600.00 6,000.00 +9.1

June 27, 2016 Spec... 6,050.00 5,500.00 +22.2

Feb 26, 2016 Spec... 4,950.00 4,500.00 +5.9

Feb 11, 2016 Spec... 4,675.00 4,250.00 +13.3

May 21, 2015 Spec... 4,125.00 4,000.00 -6.3

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Oct 10, 2014 Spec... 4,400.00 4,600.00 -13

Aug 22, 2014 Spec... 5,060.00 5,400.00 -14.8

July 14, 2014 Spec... 5,940.00 5,400.00 -24.5

April 4, 2014 Spec... 7,150.00 6,500.00 -10.3

Nov 22, 2013 Spec... 7,975.00 7,250.00 -9.4

June 21, 2013 Spec... 8,800.00 8,000.00 +25

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April 16, 2013 Spec... 7,040.00 6,400.00 +18.5

Feb 12, 2013 Spec... 5,940.00 5,400.00 -10.0

Jan 2, 2013 Spec... 6,600.00 6,000.00 -11.1

Nov 20, 2012 Spec... 7,425.00 6,750.00 -18.5

May 29, 2012 Spec... 9,113.00 6,750.00 -10.0

Feb 9, 2012 Spec... 10,125.00 7,500.00 -11.8

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Sept 26, 2011 Spec..Tier 11,475.00 8,500.00 +21.4

1

Aug 25, 2011 Spec..Tier 9,450.00 7,000.00 +27.3

1

Aug 11, 2011 Spec..Tier 7,425.00 5,500.00 +22.2

1

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June 20, 2011 Spec..Tier 6,075.00 4,500.00 -10.0

1

Jan 21, 2011 Spec..Tier 6,751.35 5,001.00 +11.1

1

Nov 16, 2010 Spec..Tier 6,075.00 4,500.00 +05.9

1

April 30, 2010 Spec..Tier 5,738.85 4,251.00 -14.9

1

March 02, 2010 Spec..Tier 6,747.30 4,998.00 --

1

Feb 12, 2010 Spec... 6,747.30 4,998.00 +24.9

Dec 15, 2009 Spec... 5,402.70 4,002.00 +20.1

Aug 21, 2009 Spec... 4,499.55 3,333.00 -16.7

Jan 22, 2009 Spec... 5,398.65 3,999.00 -07.0

Jan 08, 2009 Spec... 5,807.70 4,302.00 --

(Compiled by Bangalore Commodities desk; Editing by Leslie Adler)